/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pig.backend.hadoop.executionengine.tez.plan;
import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.Stack;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.lib.partition.HashPartitioner;
import org.apache.pig.CollectableLoadFunc;
import org.apache.pig.FuncSpec;
import org.apache.pig.IndexableLoadFunc;
import org.apache.pig.LoadFunc;
import org.apache.pig.OrderedLoadFunc;
import org.apache.pig.PigConfiguration;
import org.apache.pig.PigException;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.PigTupleWritableComparator;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MergeJoinIndexer;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.ScalarPhyFinder;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.UDFFinder;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.POStatus;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.ConstantExpression;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhyPlanVisitor;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.LitePackager;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POCollectedGroup;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POCounter;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POCross;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.PODistinct;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFRJoin;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFilter;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POGlobalRearrange;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLimit;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLoad;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POMergeCogroup;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POMergeJoin;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.PONative;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPackage;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPoissonSample;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.PORank;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POReservoirSample;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POSkewedJoin;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POSort;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POSplit;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStream;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POUnion;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.Packager.PackageType;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.util.PlanHelper;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.NativeTezOper;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POCounterStatsTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POCounterTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POFRJoinTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POIdentityInOutTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POLocalRearrangeTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POLocalRearrangeTezFactory;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POLocalRearrangeTezFactory.LocalRearrangeType;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POPartitionRearrangeTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.PORankTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POShuffledValueInputTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POStoreTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POValueInputTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POValueOutputTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.udf.FindQuantilesTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.udf.PartitionSkewedKeysTez;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.udf.ReadScalarsTez;
import org.apache.pig.backend.hadoop.executionengine.tez.runtime.SkewedPartitionerTez;
import org.apache.pig.backend.hadoop.executionengine.tez.runtime.WeightedRangePartitionerTez;
import org.apache.pig.backend.hadoop.executionengine.tez.util.TezCompilerUtil;
import org.apache.pig.data.DataType;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.builtin.DefaultIndexableLoader;
import org.apache.pig.impl.builtin.GetMemNumRows;
import org.apache.pig.impl.builtin.PartitionSkewedKeys;
import org.apache.pig.impl.io.FileLocalizer;
import org.apache.pig.impl.io.FileSpec;
import org.apache.pig.impl.plan.DepthFirstWalker;
import org.apache.pig.impl.plan.NodeIdGenerator;
import org.apache.pig.impl.plan.Operator;
import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.impl.plan.OperatorPlan;
import org.apache.pig.impl.plan.PlanException;
import org.apache.pig.impl.plan.VisitorException;
import org.apache.pig.impl.util.CompilerUtils;
import org.apache.pig.impl.util.MultiMap;
import org.apache.pig.impl.util.ObjectSerializer;
import org.apache.pig.impl.util.Pair;
import org.apache.pig.impl.util.Utils;
import org.apache.pig.newplan.logical.relational.LOJoin;
import org.apache.tez.dag.api.EdgeProperty.DataMovementType;
import org.apache.tez.runtime.library.input.OrderedGroupedKVInput;
import org.apache.tez.runtime.library.input.UnorderedKVInput;
import org.apache.tez.runtime.library.output.UnorderedKVOutput;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
/**
* The compiler that compiles a given physical plan into a DAG of Tez
* operators which can then be converted into the JobControl structure.
*/
public class TezCompiler extends PhyPlanVisitor {
private static final Log LOG = LogFactory.getLog(TezCompiler.class);
private PigContext pigContext;
private Properties pigProperties;
//The plan that is being compiled
private PhysicalPlan plan;
//The plan of Tez Operators
private TezOperPlan tezPlan;
//The current Tez Operator that is being compiled
private TezOperator curTezOp;
//The output of compiling the inputs
private TezOperator[] compiledInputs = null;
//The split operators seen till now.
//During the traversal a split is the only operator that can be revisited
//from a different path.
private Map<OperatorKey, TezOperator> splitsSeen;
private NodeIdGenerator nig;
private String scope;
private UDFFinder udfFinder;
private Map<PhysicalOperator, TezOperator> phyToTezOpMap;
public static final String USER_COMPARATOR_MARKER = "user.comparator.func:";
public static final String FILE_CONCATENATION_THRESHOLD = "pig.files.concatenation.threshold";
public static final String OPTIMISTIC_FILE_CONCATENATION = "pig.optimistic.files.concatenation";
private int fileConcatenationThreshold = 100;
private boolean optimisticFileConcatenation = false;
private POLocalRearrangeTezFactory localRearrangeFactory;
public TezCompiler(PhysicalPlan plan, PigContext pigContext)
throws TezCompilerException {
super(plan, new DepthFirstWalker<PhysicalOperator, PhysicalPlan>(plan));
this.plan = plan;
this.pigContext = pigContext;
pigProperties = pigContext.getProperties();
splitsSeen = Maps.newHashMap();
tezPlan = new TezOperPlan();
nig = NodeIdGenerator.getGenerator();
udfFinder = new UDFFinder();
List<PhysicalOperator> roots = plan.getRoots();
if((roots == null) || (roots.size() <= 0)) {
int errCode = 2053;
String msg = "Internal error. Did not find roots in the physical plan.";
throw new TezCompilerException(msg, errCode, PigException.BUG);
}
scope = roots.get(0).getOperatorKey().getScope();
localRearrangeFactory = new POLocalRearrangeTezFactory(scope, nig);
phyToTezOpMap = Maps.newHashMap();
fileConcatenationThreshold = Integer.parseInt(pigProperties
.getProperty(FILE_CONCATENATION_THRESHOLD, "100"));
optimisticFileConcatenation = pigProperties.getProperty(
OPTIMISTIC_FILE_CONCATENATION, "false").equals("true");
LOG.info("File concatenation threshold: " + fileConcatenationThreshold
+ " optimistic? " + optimisticFileConcatenation);
}
public TezOperPlan getTezPlan() {
return tezPlan;
}
// Segment a single DAG into a DAG graph
public TezPlanContainer getPlanContainer() throws PlanException {
TezPlanContainer tezPlanContainer = new TezPlanContainer(pigContext);
tezPlanContainer.addPlan(tezPlan);
return tezPlanContainer;
}
/**
* The front-end method that the user calls to compile the plan. Assumes
* that all submitted plans have a Store operators as the leaf.
* @return A Tez plan
* @throws IOException
* @throws PlanException
* @throws VisitorException
*/
public TezOperPlan compile() throws IOException, PlanException, VisitorException {
List<PhysicalOperator> leaves = plan.getLeaves();
if (!pigContext.inIllustrator) {
for (PhysicalOperator op : leaves) {
if (!(op instanceof POStore)) {
int errCode = 2025;
String msg = "Expected leaf of reduce plan to " +
"always be POStore. Found " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG);
}
}
}
// get all stores, sort them in order(operator id) and compile their
// plans
List<POStore> stores = PlanHelper.getPhysicalOperators(plan, POStore.class);
List<PONative> nativeTezs= PlanHelper.getPhysicalOperators(plan, PONative.class);
List<PhysicalOperator> ops;
if (!pigContext.inIllustrator) {
ops = new ArrayList<PhysicalOperator>(stores.size() + nativeTezs.size());
ops.addAll(stores);
} else {
ops = new ArrayList<PhysicalOperator>(leaves.size() + nativeTezs.size());
ops.addAll(leaves);
}
ops.addAll(nativeTezs);
Collections.sort(ops);
for (PhysicalOperator op : ops) {
compile(op);
}
for (TezOperator tezOper : splitsSeen.values()) {
int idx = 0;
List<POStore> strs = PlanHelper.getPhysicalOperators(tezOper.plan,
POStore.class);
for (POStore op : strs) {
op.setIndex(idx++);
}
tezOper.setClosed(true);
}
fixScalar();
return tezPlan;
}
private void fixScalar() throws VisitorException, PlanException {
// Mapping POStore to POValueOuptut
Map<POStore, POValueOutputTez> storeSeen = new HashMap<POStore, POValueOutputTez>();
for (TezOperator tezOp : tezPlan) {
List<POUserFunc> userFuncs = PlanHelper.getPhysicalOperators(tezOp.plan, POUserFunc.class);
for (POUserFunc userFunc : userFuncs) {
if (userFunc.getReferencedOperator()!=null) { // Scalar
POStore store = (POStore)userFunc.getReferencedOperator();
TezOperator from = phyToTezOpMap.get(store);
FuncSpec newSpec = new FuncSpec(ReadScalarsTez.class.getName(), from.getOperatorKey().toString());
userFunc.setFuncSpec(newSpec);
if (storeSeen.containsKey(store)) {
storeSeen.get(store).addOutputKey(tezOp.getOperatorKey().toString());
} else {
POValueOutputTez output = new POValueOutputTez(OperatorKey.genOpKey(scope));
output.addOutputKey(tezOp.getOperatorKey().toString());
from.plan.remove(from.plan.getOperator(store.getOperatorKey()));
from.plan.addAsLeaf(output);
storeSeen.put(store, output);
//Remove unused store filename
userFunc.getInputs().remove(1);
}
TezEdgeDescriptor edge = TezCompilerUtil.connect(tezPlan, from, tezOp);
//TODO shared edge once support is available in Tez
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.BROADCAST);
}
}
}
}
/**
* Compiles the plan below op into a Tez Operator
* and stores it in curTezOp.
* @param op
* @throws IOException
* @throws PlanException
* @throws VisitorException
*/
private void compile(PhysicalOperator op) throws IOException, PlanException, VisitorException {
// An artifact of the Visitor. Need to save this so that it is not
// overwritten.
TezOperator[] prevCompInp = compiledInputs;
// Compile each predecessor into the TezOperator and store them away so
// that we can use them for compiling op.
List<PhysicalOperator> predecessors = plan.getPredecessors(op);
if(op instanceof PONative){
// the predecessor (store) has already been processed
// don't process it again
}
else if (predecessors != null && predecessors.size() > 0) {
// When processing an entire script (multiquery), we can get into a
// situation where a load has predecessors. This means that it
// depends on some store earlier in the plan. We need to take that
// dependency and connect the respective Tez operators, while at the
// same time removing the connection between the Physical operators.
// That way the jobs will run in the right order.
if (op instanceof POLoad) {
if (predecessors.size() != 1) {
int errCode = 2125;
String msg = "Expected at most one predecessor of load. Got "+predecessors.size();
throw new PlanException(msg, errCode, PigException.BUG);
}
PhysicalOperator p = predecessors.get(0);
TezOperator oper = null;
if (p instanceof POStore || p instanceof PONative) {
oper = phyToTezOpMap.get(p);
} else {
int errCode = 2126;
String msg = "Predecessor of load should be a store or native oper. Got " + p.getClass();
throw new PlanException(msg, errCode, PigException.BUG);
}
if (p instanceof POStore) {
PhysicalOperator store = oper.plan.getOperator(p.getOperatorKey());
// replace POStore to POValueOutputTez, convert the tezOperator to splitter
oper.plan.disconnect(oper.plan.getPredecessors(store).get(0), store);
oper.plan.remove(store);
POValueOutputTez valueOutput = new POValueOutputTez(new OperatorKey(scope,nig.getNextNodeId(scope)));
oper.plan.addAsLeaf(valueOutput);
oper.setSplitter(true);
// Create a splittee of store only
TezOperator storeOnlyTezOperator = getTezOp();
PhysicalPlan storeOnlyPhyPlan = new PhysicalPlan();
POValueInputTez valueInput = new POValueInputTez(new OperatorKey(scope,nig.getNextNodeId(scope)));
valueInput.setInputKey(oper.getOperatorKey().toString());
storeOnlyPhyPlan.addAsLeaf(valueInput);
storeOnlyPhyPlan.addAsLeaf(store);
storeOnlyTezOperator.plan = storeOnlyPhyPlan;
tezPlan.add(storeOnlyTezOperator);
phyToTezOpMap.put(store, storeOnlyTezOperator);
// Create new operator as second splittee
curTezOp = getTezOp();
POValueInputTez valueInput2 = new POValueInputTez(new OperatorKey(scope,nig.getNextNodeId(scope)));
valueInput2.setInputKey(oper.getOperatorKey().toString());
curTezOp.plan.add(valueInput2);
tezPlan.add(curTezOp);
// Connect splitter to splittee
TezEdgeDescriptor edge = TezCompilerUtil.connect(tezPlan, oper, storeOnlyTezOperator);
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.ONE_TO_ONE);
storeOnlyTezOperator.setRequestedParallelismByReference(oper);
edge = TezCompilerUtil.connect(tezPlan, oper, curTezOp);
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.ONE_TO_ONE);
curTezOp.setRequestedParallelismByReference(oper);
} else if (p instanceof PONative) {
// Need new operator
curTezOp = getTezOp();
curTezOp.plan.add(op);
tezPlan.add(curTezOp);
plan.disconnect(op, p);
TezCompilerUtil.connect(tezPlan, oper, curTezOp);
phyToTezOpMap.put(op, curTezOp);
return;
}
return;
}
Collections.sort(predecessors);
if(op instanceof POSplit && splitsSeen.containsKey(op.getOperatorKey())){
// skip follow up POSplit
} else {
compiledInputs = new TezOperator[predecessors.size()];
int i = -1;
for (PhysicalOperator pred : predecessors) {
compile(pred);
compiledInputs[++i] = curTezOp;
}
}
} else {
// No predecessors. Mostly a load. But this is where we start. We
// create a new TezOp and add its first operator op. Also this
// should be added to the tezPlan.
curTezOp = getTezOp();
curTezOp.plan.add(op);
curTezOp.setUseMRMapSettings(true);
if (op !=null && op instanceof POLoad) {
if (((POLoad)op).getLFile()!=null && ((POLoad)op).getLFile().getFuncSpec()!=null)
curTezOp.UDFs.add(((POLoad)op).getLFile().getFuncSpec().toString());
}
tezPlan.add(curTezOp);
phyToTezOpMap.put(op, curTezOp);
return;
}
// Now we have the inputs compiled. Do something with the input oper op.
op.visit(this);
compiledInputs = prevCompInp;
}
private void nonBlocking(PhysicalOperator op) throws PlanException, IOException {
TezOperator tezOp;
if (compiledInputs.length == 1) {
tezOp = compiledInputs[0];
if (tezOp.isClosed()) {
int errCode = 2027;
String msg = "Tez operator has been closed. This is unexpected for a merge.";
throw new PlanException(msg, errCode, PigException.BUG);
}
} else {
tezOp = merge(compiledInputs);
}
tezOp.plan.addAsLeaf(op);
curTezOp = tezOp;
}
private void blocking() throws IOException, PlanException {
TezOperator newTezOp = getTezOp();
tezPlan.add(newTezOp);
for (TezOperator tezOp : compiledInputs) {
tezOp.setClosed(true);
TezCompilerUtil.connect(tezPlan, tezOp, newTezOp);
}
curTezOp = newTezOp;
}
private POSplit findPOSplit(TezOperator tezOp, OperatorKey splitKey)
throws PlanException {
POSplit split = (POSplit) tezOp.plan.getOperator(splitKey);
if (split != null) {
// The split is the leaf operator.
return split;
} else {
// The split is a nested split
Stack<POSplit> stack = new Stack<POSplit>();
split = (POSplit) tezOp.plan.getLeaves().get(0);
stack.push(split);
while (!stack.isEmpty()) {
split = stack.pop();
for (PhysicalPlan plan : split.getPlans()) {
PhysicalOperator op = plan.getLeaves().get(0);
if (op instanceof POSplit) {
split = (POSplit) op;
if (split.getOperatorKey().equals(splitKey)) {
return split;
} else {
stack.push(split);
}
}
}
}
}
// TODO: what should be the new error code??
throw new PlanException(
"Could not find the split operator " + splitKey, 2059,
PigException.BUG);
}
/**
* Merges the TezOperators in the compiledInputs into a single merged
* TezOperator.
*
* Care is taken to remove the TezOperators that are merged from the TezPlan
* and their connections moved over to the merged map TezOperator.
*
* Merge is implemented as a sequence of binary merges.
* merge(PhyPlan finPlan, List<PhyPlan> lst) := finPlan, merge(p) foreach p in lst
*
* @param compiledInputs
* @return merged TezOperator
* @throws PlanException
* @throws IOException
*/
private TezOperator merge(TezOperator[] compiledInputs) throws PlanException {
TezOperator ret = getTezOp();
tezPlan.add(ret);
Set<TezOperator> toBeConnected = Sets.newHashSet();
List<TezOperator> toBeRemoved = Lists.newArrayList();
List<PhysicalPlan> toBeMerged = Lists.newArrayList();
for (TezOperator tezOp : compiledInputs) {
if (!tezOp.isClosed()) {
toBeRemoved.add(tezOp);
toBeMerged.add(tezOp.plan);
List<TezOperator> predecessors = tezPlan.getPredecessors(tezOp);
if (predecessors != null) {
for (TezOperator predecessorTezOp : predecessors) {
toBeConnected.add(predecessorTezOp);
}
}
} else {
int errCode = 2027;
String msg = "Tez operator has been closed. This is unexpected for a merge.";
throw new PlanException(msg, errCode, PigException.BUG);
}
}
merge(ret.plan, toBeMerged);
Iterator<TezOperator> it = toBeConnected.iterator();
while (it.hasNext()) {
tezPlan.connect(it.next(), ret);
}
for (TezOperator tezOp : toBeRemoved) {
if (tezOp.getRequestedParallelism() > ret.getRequestedParallelism()) {
ret.setRequestedParallelism(tezOp.getRequestedParallelism());
}
for (String udf : tezOp.UDFs) {
if (!ret.UDFs.contains(udf)) {
ret.UDFs.add(udf);
}
}
// We also need to change scalar marking
for (PhysicalOperator physOp : tezOp.scalars) {
if (!ret.scalars.contains(physOp)) {
ret.scalars.add(physOp);
}
}
Set<PhysicalOperator> opsToChange = Sets.newHashSet();
for (Map.Entry<PhysicalOperator, TezOperator> entry : phyToTezOpMap.entrySet()) {
if (entry.getValue()==tezOp) {
opsToChange.add(entry.getKey());
}
}
for (PhysicalOperator op : opsToChange) {
phyToTezOpMap.put(op, ret);
}
tezPlan.remove(tezOp);
}
return ret;
}
/**
* The merge of a list of plans into a single plan
* @param <O>
* @param <E>
* @param finPlan - Final Plan into which the list of plans is merged
* @param plans - list of plans to be merged
* @throws PlanException
*/
private <O extends Operator<?>, E extends OperatorPlan<O>> void merge(
E finPlan, List<E> plans) throws PlanException {
for (E e : plans) {
finPlan.merge(e);
}
}
private void processUDFs(PhysicalPlan plan) throws VisitorException {
if (plan != null) {
//Process Scalars (UDF with referencedOperators)
ScalarPhyFinder scalarPhyFinder = new ScalarPhyFinder(plan);
scalarPhyFinder.visit();
curTezOp.scalars.addAll(scalarPhyFinder.getScalars());
//Process UDFs
udfFinder.setPlan(plan);
udfFinder.visit();
curTezOp.UDFs.addAll(udfFinder.getUDFs());
}
}
@Override
public void visitCollectedGroup(POCollectedGroup op) throws VisitorException {
List<PhysicalOperator> roots = curTezOp.plan.getRoots();
if(roots.size() != 1){
int errCode = 2171;
String errMsg = "Expected one but found more then one root physical operator in physical plan.";
throw new TezCompilerException(errMsg,errCode,PigException.BUG);
}
PhysicalOperator phyOp = roots.get(0);
if(! (phyOp instanceof POLoad)){
int errCode = 2172;
String errMsg = "Expected physical operator at root to be POLoad. Found : "+phyOp.getClass().getCanonicalName();
throw new TezCompilerException(errMsg,errCode,PigException.BUG);
}
LoadFunc loadFunc = ((POLoad)phyOp).getLoadFunc();
try {
if(!(CollectableLoadFunc.class.isAssignableFrom(loadFunc.getClass()))){
int errCode = 2249;
throw new TezCompilerException("While using 'collected' on group; data must be loaded via loader implementing CollectableLoadFunc.", errCode);
}
((CollectableLoadFunc)loadFunc).ensureAllKeyInstancesInSameSplit();
} catch (TezCompilerException e){
throw (e);
} catch (IOException e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
try{
nonBlocking(op);
phyToTezOpMap.put(op, curTezOp);
}catch(Exception e){
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitCounter(POCounter op) throws VisitorException {
// Refer visitRank(PORank) for more details
try{
POCounterTez counterTez = new POCounterTez(op);
nonBlocking(counterTez);
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitCross(POCross op) throws VisitorException {
try{
nonBlocking(op);
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitDistinct(PODistinct op) throws VisitorException {
try {
POLocalRearrangeTez lr = localRearrangeFactory.create();
lr.setDistinct(true);
lr.copyAliasFrom(op);
curTezOp.plan.addAsLeaf(lr);
TezOperator lastOp = curTezOp;
// Mark the start of a new TezOperator, connecting the inputs.
blocking();
TezCompilerUtil.setCustomPartitioner(op.getCustomPartitioner(), curTezOp);
// Add the DISTINCT plan as the combine plan. In MR Pig, the combiner is implemented
// with a global variable and a specific DistinctCombiner class. This seems better.
PhysicalPlan combinePlan = curTezOp.inEdges.get(lastOp.getOperatorKey()).combinePlan;
addDistinctPlan(combinePlan, 1);
POLocalRearrangeTez clr = localRearrangeFactory.create();
clr.setOutputKey(curTezOp.getOperatorKey().toString());
clr.setDistinct(true);
combinePlan.addAsLeaf(clr);
addDistinctPlan(curTezOp.plan, op.getRequestedParallelism());
curTezOp.setRequestedParallelism(op.getRequestedParallelism());
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Cannot compile " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG);
}
}
// Adds the plan for DISTINCT. Note that the PODistinct is not actually added to the plan, but
// rather is implemented by the action of the local rearrange, shuffle and project operations.
private void addDistinctPlan(PhysicalPlan plan, int rp) throws PlanException {
POPackage pkg = getPackage(1, DataType.TUPLE);
pkg.getPkgr().setDistinct(true);
plan.addAsLeaf(pkg);
POProject project = new POProject(OperatorKey.genOpKey(scope));
project.setResultType(DataType.TUPLE);
project.setStar(false);
project.setColumn(0);
project.setOverloaded(false);
POForEach forEach = TezCompilerUtil.getForEach(project, rp, scope, nig);
plan.addAsLeaf(forEach);
}
@Override
public void visitFilter(POFilter op) throws VisitorException {
try {
nonBlocking(op);
processUDFs(op.getPlan());
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitFRJoin(POFRJoin op) throws VisitorException {
try {
List<String> inputKeys = Lists.newArrayList();
curTezOp = phyToTezOpMap.get(op.getInputs().get(op.getFragment()));
for (int i = 0; i < compiledInputs.length; i++) {
TezOperator tezOp = compiledInputs[i];
if (curTezOp.equals(tezOp)) {
continue;
}
if (!tezOp.isClosed()) {
POLocalRearrangeTez lr = new POLocalRearrangeTez(op.getLRs()[i]);
lr.setOutputKey(curTezOp.getOperatorKey().toString());
lr.setConnectedToPackage(false);
tezOp.plan.addAsLeaf(lr);
TezEdgeDescriptor edge = TezCompilerUtil.connect(tezPlan, tezOp, curTezOp);
inputKeys.add(tezOp.getOperatorKey().toString());
// Configure broadcast edges for replicated tables
edge.dataMovementType = DataMovementType.BROADCAST;
edge.outputClassName = UnorderedKVOutput.class.getName();
edge.inputClassName = UnorderedKVInput.class.getName();
} else {
int errCode = 2022;
String msg = "The current operator is closed. This is unexpected while compiling.";
throw new TezCompilerException(msg, errCode, PigException.BUG);
}
}
if (!curTezOp.isClosed()) {
curTezOp.plan.addAsLeaf(new POFRJoinTez(op, inputKeys));
} else {
int errCode = 2022;
String msg = "The current operator is closed. This is unexpected while compiling.";
throw new TezCompilerException(msg, errCode, PigException.BUG);
}
List<List<PhysicalPlan>> joinPlans = op.getJoinPlans();
if (joinPlans != null) {
for (List<PhysicalPlan> joinPlan : joinPlans) {
if (joinPlan != null) {
for (PhysicalPlan plan : joinPlan) {
processUDFs(plan);
}
}
}
}
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitLimit(POLimit op) throws VisitorException {
try {
if (op.getLimitPlan() != null) {
processUDFs(op.getLimitPlan());
}
// As an optimization, we'll add a limit to the end of the last tezOp. Note that in
// some cases, such as when we have ORDER BY followed by LIMIT, the LimitOptimizer has
// already removed the POLimit from the physical plan.
if (!pigContext.inIllustrator) {
nonBlocking(op);
phyToTezOpMap.put(op, curTezOp);
}
boolean limitAfterSort = curTezOp.isGlobalSort();
// If the parallelism of the current vertex is one and it doesn't do a LOAD (whose
// parallelism is determined by the InputFormat), we don't need another vertex.
if (curTezOp.getRequestedParallelism() == 1 || curTezOp.isUnion()) {
boolean canStop = true;
for (PhysicalOperator planOp : curTezOp.plan.getRoots()) {
if (planOp instanceof POLoad) {
canStop = false;
break;
}
}
if (canStop) {
// Let's piggyback on the Union operator. UnionOptimizer
// will skip this union operator as it is a waste to
// do a vertex group followed by another limit in this case
if (curTezOp.isUnion()) {
curTezOp.setRequestedParallelism(1);
}
curTezOp.setDontEstimateParallelism(true);
if (limitAfterSort) {
curTezOp.markLimitAfterSort();
} else {
curTezOp.markLimit();
}
return;
}
}
// Need to add POValueOutputTez to the end of the last tezOp
POValueOutputTez output = new POValueOutputTez(OperatorKey.genOpKey(scope));
output.copyAliasFrom(op);
curTezOp.plan.addAsLeaf(output);
TezOperator prevOp = curTezOp;
// Mark the start of a new TezOperator which will do the actual limiting with 1 task.
blocking();
// Explicitly set the parallelism for the new vertex to 1.
curTezOp.setRequestedParallelism(1);
curTezOp.setDontEstimateParallelism(true);
output.addOutputKey(curTezOp.getOperatorKey().toString());
// LIMIT does not make any ordering guarantees and this is unsorted shuffle.
TezEdgeDescriptor edge = curTezOp.inEdges.get(prevOp.getOperatorKey());
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.SCATTER_GATHER);
// Limit after order by with scalar expression
if (limitAfterSort) {
curTezOp.markLimitAfterSort();
output.setTaskIndexWithRecordIndexAsKey(true);
// POValueOutputTez will write key (task index, record index) in
// sorted order. So using UnorderedKVOutput instead of OrderedPartitionedKVOutput.
// But input needs to be merged in sorter order and requires OrderedGroupedKVInput
edge.outputClassName = UnorderedKVOutput.class.getName();
edge.inputClassName = OrderedGroupedKVInput.class.getName();
edge.setIntermediateOutputKeyClass(TezCompilerUtil.TUPLE_CLASS);
edge.setIntermediateOutputKeyComparatorClass(PigTupleWritableComparator.class.getName());
} else {
curTezOp.markLimit();
}
// Then add a POValueInputTez to the start of the new tezOp.
POValueInputTez input = new POValueInputTez(OperatorKey.genOpKey(scope));
input.copyAliasFrom(op);
input.setInputKey(prevOp.getOperatorKey().toString());
curTezOp.plan.addAsLeaf(input);
if (!pigContext.inIllustrator) {
POLimit limitCopy = new POLimit(OperatorKey.genOpKey(scope));
limitCopy.copyAliasFrom(op);
limitCopy.setLimit(op.getLimit());
limitCopy.setLimitPlan(op.getLimitPlan());
curTezOp.plan.addAsLeaf(limitCopy);
} else {
curTezOp.plan.addAsLeaf(op);
}
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitLoad(POLoad op) throws VisitorException {
try {
nonBlocking(op);
curTezOp.setUseMRMapSettings(true);
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitLocalRearrange(POLocalRearrange op) throws VisitorException {
try{
POLocalRearrange opTez = new POLocalRearrangeTez(op);
nonBlocking(opTez);
List<PhysicalPlan> plans = opTez.getPlans();
if (plans != null) {
for (PhysicalPlan ep : plans) {
processUDFs(ep);
}
}
phyToTezOpMap.put(opTez, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitGlobalRearrange(POGlobalRearrange op) throws VisitorException {
try {
blocking();
TezCompilerUtil.setCustomPartitioner(op.getCustomPartitioner(), curTezOp);
curTezOp.setRequestedParallelism(op.getRequestedParallelism());
if (op.isCross()) {
curTezOp.addCrossKey(op.getOperatorKey().toString());
}
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitMergeCoGroup(POMergeCogroup poCoGrp) throws VisitorException {
if(compiledInputs.length < 2){
int errCode=2251;
String errMsg = "Merge Cogroup work on two or more relations." +
"To use map-side group-by on single relation, use 'collected' qualifier.";
throw new TezCompilerException(errMsg, errCode);
}
List<FuncSpec> funcSpecs = new ArrayList<FuncSpec>(compiledInputs.length-1);
List<String> fileSpecs = new ArrayList<String>(compiledInputs.length-1);
List<String> loaderSigns = new ArrayList<String>(compiledInputs.length-1);
try{
poCoGrp.setEndOfRecordMark(POStatus.STATUS_NULL);
// Iterate through all the TezOpererators, disconnect side TezOperators from
// TezOperator and collect all the information needed in different lists.
for(int i=0 ; i < compiledInputs.length; i++){
TezOperator tezOper = compiledInputs[i];
PhysicalPlan plan = tezOper.plan;
if(plan.getRoots().size() != 1){
int errCode = 2171;
String errMsg = "Expected one but found more then one root physical operator in physical plan.";
throw new TezCompilerException(errMsg,errCode,PigException.BUG);
}
PhysicalOperator rootPOOp = plan.getRoots().get(0);
if(! (rootPOOp instanceof POLoad)){
int errCode = 2172;
String errMsg = "Expected physical operator at root to be POLoad. Found : "+rootPOOp.getClass().getCanonicalName();
throw new TezCompilerException(errMsg,errCode);
}
POLoad sideLoader = (POLoad)rootPOOp;
FileSpec loadFileSpec = sideLoader.getLFile();
FuncSpec funcSpec = loadFileSpec.getFuncSpec();
LoadFunc loadfunc = sideLoader.getLoadFunc();
if(i == 0){
if(!(CollectableLoadFunc.class.isAssignableFrom(loadfunc.getClass()))){
int errCode = 2252;
throw new TezCompilerException("Base loader in Cogroup must implement CollectableLoadFunc.", errCode);
}
((CollectableLoadFunc)loadfunc).ensureAllKeyInstancesInSameSplit();
continue;
}
if(!(IndexableLoadFunc.class.isAssignableFrom(loadfunc.getClass()))){
int errCode = 2253;
throw new TezCompilerException("Side loaders in cogroup must implement IndexableLoadFunc.", errCode);
}
funcSpecs.add(funcSpec);
fileSpecs.add(loadFileSpec.getFileName());
loaderSigns.add(sideLoader.getSignature());
tezPlan.remove(tezOper);
}
poCoGrp.setSideLoadFuncs(funcSpecs);
poCoGrp.setSideFileSpecs(fileSpecs);
poCoGrp.setLoaderSignatures(loaderSigns);
// Use tez operator of base relation for the cogroup operation.
TezOperator baseMROp = phyToTezOpMap.get(poCoGrp.getInputs().get(0));
if(baseMROp.isClosed()){
int errCode = 2254;
throw new TezCompilerException("Currently merged cogroup is not supported after blocking operators.", errCode);
}
// Create new map-reduce operator for indexing job and then configure it.
TezOperator indexerTezOp = getTezOp();
FileSpec idxFileSpec = getIndexingJob(indexerTezOp, baseMROp, poCoGrp.getLRInnerPlansOf(0));
poCoGrp.setIdxFuncSpec(idxFileSpec.getFuncSpec());
poCoGrp.setIndexFileName(idxFileSpec.getFileName());
baseMROp.plan.addAsLeaf(poCoGrp);
for (FuncSpec funcSpec : funcSpecs)
baseMROp.UDFs.add(funcSpec.toString());
phyToTezOpMap.put(poCoGrp,baseMROp);
// Going forward, new operators should be added in baseMRop. To make
// sure, reset curMROp.
curTezOp = baseMROp;
}
catch (ExecException e){
throw new TezCompilerException(e.getDetailedMessage(),e.getErrorCode(),e.getErrorSource(),e);
}
catch (TezCompilerException mrce){
throw(mrce);
}
catch (CloneNotSupportedException e) {
throw new TezCompilerException(e);
}
catch(PlanException e){
int errCode = 2034;
String msg = "Error compiling operator " + poCoGrp.getClass().getCanonicalName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
catch (IOException e){
int errCode = 3000;
String errMsg = "IOException caught while compiling POMergeCoGroup";
throw new TezCompilerException(errMsg, errCode,e);
}
}
// Sets up the indexing job for map-side cogroups.
private FileSpec getIndexingJob(TezOperator indexerTezOp,
final TezOperator baseTezOp, final List<PhysicalPlan> mapperLRInnerPlans)
throws TezCompilerException, PlanException, ExecException, IOException, CloneNotSupportedException {
// First replace loader with MergeJoinIndexer.
PhysicalPlan basePlan = baseTezOp.plan;
POLoad baseLoader = (POLoad)basePlan.getRoots().get(0);
FileSpec origLoaderFileSpec = baseLoader.getLFile();
FuncSpec funcSpec = origLoaderFileSpec.getFuncSpec();
LoadFunc loadFunc = baseLoader.getLoadFunc();
if (! (OrderedLoadFunc.class.isAssignableFrom(loadFunc.getClass()))){
int errCode = 1104;
String errMsg = "Base relation of merge-coGroup must implement " +
"OrderedLoadFunc interface. The specified loader "
+ funcSpec + " doesn't implement it";
throw new TezCompilerException(errMsg,errCode);
}
String[] indexerArgs = new String[6];
indexerArgs[0] = funcSpec.toString();
indexerArgs[1] = ObjectSerializer.serialize((Serializable)mapperLRInnerPlans);
indexerArgs[3] = baseLoader.getSignature();
indexerArgs[4] = baseLoader.getOperatorKey().scope;
indexerArgs[5] = Boolean.toString(false); // we care for nulls.
PhysicalPlan phyPlan;
if (basePlan.getSuccessors(baseLoader) == null
|| basePlan.getSuccessors(baseLoader).isEmpty()){
// Load-Load-Cogroup case.
phyPlan = null;
}
else{ // We got something. Yank it and set it as inner plan.
phyPlan = basePlan.clone();
PhysicalOperator root = phyPlan.getRoots().get(0);
phyPlan.disconnect(root, phyPlan.getSuccessors(root).get(0));
phyPlan.remove(root);
}
indexerArgs[2] = ObjectSerializer.serialize(phyPlan);
POLoad idxJobLoader = new POLoad(new OperatorKey(scope,nig.getNextNodeId(scope)));
idxJobLoader.setPc(pigContext);
idxJobLoader.setIsTmpLoad(true);
idxJobLoader.setLFile(new FileSpec(origLoaderFileSpec.getFileName(),
new FuncSpec(MergeJoinIndexer.class.getName(), indexerArgs)));
indexerTezOp.plan.add(idxJobLoader);
indexerTezOp.UDFs.add(baseLoader.getLFile().getFuncSpec().toString());
// Loader of mro will return a tuple of form -
// (key1, key2, .. , WritableComparable, splitIndex). See MergeJoinIndexer for details.
// After getting an index entry in each mapper, send all of them to one
// vertex where they will be sorted on the way by Hadoop.
TezOperator indexAggrOper = getTezOp();
tezPlan.add(indexAggrOper);
tezPlan.add(indexerTezOp);
TezCompilerUtil.simpleConnectTwoVertex(tezPlan, indexerTezOp, indexAggrOper, scope, nig);
TezCompilerUtil.connect(tezPlan, indexAggrOper, baseTezOp);
indexAggrOper.segmentBelow = true;
indexerTezOp.setRequestedParallelism(1); // we need exactly one reducer for indexing job.
indexerTezOp.setDontEstimateParallelism(true);
POStore st = TezCompilerUtil.getStore(scope, nig);
FileSpec strFile = getTempFileSpec();
st.setSFile(strFile);
indexAggrOper.plan.addAsLeaf(st);
indexAggrOper.setClosed(true);
return strFile;
}
/** Since merge-join works on two inputs there are exactly two TezOper predecessors identified as left and right.
* Right input generates index on-the-fly. This consists of two Tez vertexes. The first vertex generates index,
* and the second vertex sort them.
* Left input contains POMergeJoin which do the actual join.
* First right Tez oper is identified as rightTezOpr, second is identified as rightTezOpr2
* Left Tez oper is identified as curTezOper.
* 1) RightTezOpr: It can be preceded only by POLoad. If there is anything else
* in physical plan, that is yanked and set as inner plans of joinOp.
* 2) LeftTezOper: add the Join operator in it.
*
* We also need to segment the DAG into two, because POMergeJoin depends on the index file which loads with
* DefaultIndexableLoader. It is possible to convert the index as a broadcast input, but that is costly
* because a lot of logic is built into DefaultIndexableLoader. We can revisit it later.
*/
@Override
public void visitMergeJoin(POMergeJoin joinOp) throws VisitorException {
try{
joinOp.setEndOfRecordMark(POStatus.STATUS_NULL);
if(compiledInputs.length != 2 || joinOp.getInputs().size() != 2){
int errCode=1101;
throw new TezCompilerException("Merge Join must have exactly two inputs. Found : "+compiledInputs.length, errCode);
}
curTezOp = phyToTezOpMap.get(joinOp.getInputs().get(0));
TezOperator rightTezOpr = null;
TezOperator rightTezOprAggr = null;
if(curTezOp.equals(compiledInputs[0]))
rightTezOpr = compiledInputs[1];
else
rightTezOpr = compiledInputs[0];
// We will first operate on right side which is indexer job.
// First yank plan of the compiled right input and set that as an inner plan of right operator.
PhysicalPlan rightPipelinePlan;
if(!rightTezOpr.closed){
PhysicalPlan rightPlan = rightTezOpr.plan;
if(rightPlan.getRoots().size() != 1){
int errCode = 2171;
String errMsg = "Expected one but found more then one root physical operator in physical plan.";
throw new TezCompilerException(errMsg,errCode,PigException.BUG);
}
PhysicalOperator rightLoader = rightPlan.getRoots().get(0);
if(! (rightLoader instanceof POLoad)){
int errCode = 2172;
String errMsg = "Expected physical operator at root to be POLoad. Found : "+rightLoader.getClass().getCanonicalName();
throw new TezCompilerException(errMsg,errCode);
}
if (rightPlan.getSuccessors(rightLoader) == null || rightPlan.getSuccessors(rightLoader).isEmpty())
// Load - Join case.
rightPipelinePlan = null;
else{ // We got something on right side. Yank it and set it as inner plan of right input.
rightPipelinePlan = rightPlan.clone();
PhysicalOperator root = rightPipelinePlan.getRoots().get(0);
rightPipelinePlan.disconnect(root, rightPipelinePlan.getSuccessors(root).get(0));
rightPipelinePlan.remove(root);
rightPlan.trimBelow(rightLoader);
}
}
else{
int errCode = 2022;
String msg = "Right input plan have been closed. This is unexpected while compiling.";
throw new PlanException(msg, errCode, PigException.BUG);
}
joinOp.setupRightPipeline(rightPipelinePlan);
// At this point, we must be operating on input plan of right input and it would contain nothing else other then a POLoad.
POLoad rightLoader = (POLoad)rightTezOpr.plan.getRoots().get(0);
joinOp.setSignature(rightLoader.getSignature());
LoadFunc rightLoadFunc = rightLoader.getLoadFunc();
List<String> udfs = new ArrayList<String>();
if(IndexableLoadFunc.class.isAssignableFrom(rightLoadFunc.getClass())) {
joinOp.setRightLoaderFuncSpec(rightLoader.getLFile().getFuncSpec());
joinOp.setRightInputFileName(rightLoader.getLFile().getFileName());
udfs.add(rightLoader.getLFile().getFuncSpec().toString());
// we don't need the right TezOper since
// the right loader is an IndexableLoadFunc which can handle the index
// itself
tezPlan.remove(rightTezOpr);
if(rightTezOpr == compiledInputs[0]) {
compiledInputs[0] = null;
} else if(rightTezOpr == compiledInputs[1]) {
compiledInputs[1] = null;
}
rightTezOpr = null;
// validate that the join keys in merge join are only
// simple column projections or '*' and not expression - expressions
// cannot be handled when the index is built by the storage layer on the sorted
// data when the sorted data (and corresponding index) is written.
// So merge join will be restricted not have expressions as
// join keys
int numInputs = mPlan.getPredecessors(joinOp).size(); // should be 2
for(int i = 0; i < numInputs; i++) {
List<PhysicalPlan> keyPlans = joinOp.getInnerPlansOf(i);
for (PhysicalPlan keyPlan : keyPlans) {
for(PhysicalOperator op : keyPlan) {
if(!(op instanceof POProject)) {
int errCode = 1106;
String errMsg = "Merge join is possible only for simple column or '*' join keys when using " +
rightLoader.getLFile().getFuncSpec() + " as the loader";
throw new TezCompilerException(errMsg, errCode, PigException.INPUT);
}
}
}
}
} else {
LoadFunc loadFunc = rightLoader.getLoadFunc();
//Replacing POLoad with indexer is disabled for 'merge-sparse' joins. While
//this feature would be useful, the current implementation of DefaultIndexableLoader
//is not designed to handle multiple calls to seekNear. Specifically, it rereads the entire index
//for each call. Some refactoring of this class is required - and then the check below could be removed.
if (joinOp.getJoinType() == LOJoin.JOINTYPE.MERGESPARSE) {
int errCode = 1104;
String errMsg = "Right input of merge-join must implement IndexableLoadFunc. " +
"The specified loader " + loadFunc + " doesn't implement it";
throw new TezCompilerException(errMsg,errCode);
}
// Replace POLoad with indexer.
if (! (OrderedLoadFunc.class.isAssignableFrom(loadFunc.getClass()))){
int errCode = 1104;
String errMsg = "Right input of merge-join must implement " +
"OrderedLoadFunc interface. The specified loader "
+ loadFunc + " doesn't implement it";
throw new TezCompilerException(errMsg,errCode);
}
String[] indexerArgs = new String[6];
List<PhysicalPlan> rightInpPlans = joinOp.getInnerPlansOf(1);
FileSpec origRightLoaderFileSpec = rightLoader.getLFile();
indexerArgs[0] = origRightLoaderFileSpec.getFuncSpec().toString();
indexerArgs[1] = ObjectSerializer.serialize((Serializable)rightInpPlans);
indexerArgs[2] = ObjectSerializer.serialize(rightPipelinePlan);
indexerArgs[3] = rightLoader.getSignature();
indexerArgs[4] = rightLoader.getOperatorKey().scope;
indexerArgs[5] = Boolean.toString(true);
FileSpec lFile = new FileSpec(rightLoader.getLFile().getFileName(),new FuncSpec(MergeJoinIndexer.class.getName(), indexerArgs));
rightLoader.setLFile(lFile);
// Loader of operator will return a tuple of form -
// (keyFirst1, keyFirst2, .. , position, splitIndex) See MergeJoinIndexer
rightTezOprAggr = getTezOp();
tezPlan.add(rightTezOprAggr);
TezCompilerUtil.simpleConnectTwoVertex(tezPlan, rightTezOpr, rightTezOprAggr, scope, nig);
rightTezOprAggr.setRequestedParallelism(1); // we need exactly one task for indexing job.
rightTezOprAggr.setDontEstimateParallelism(true);
POStore st = TezCompilerUtil.getStore(scope, nig);
FileSpec strFile = getTempFileSpec();
st.setSFile(strFile);
rightTezOprAggr.plan.addAsLeaf(st);
rightTezOprAggr.setClosed(true);
rightTezOprAggr.segmentBelow = true;
// set up the DefaultIndexableLoader for the join operator
String[] defaultIndexableLoaderArgs = new String[5];
defaultIndexableLoaderArgs[0] = origRightLoaderFileSpec.getFuncSpec().toString();
defaultIndexableLoaderArgs[1] = strFile.getFileName();
defaultIndexableLoaderArgs[2] = strFile.getFuncSpec().toString();
defaultIndexableLoaderArgs[3] = joinOp.getOperatorKey().scope;
defaultIndexableLoaderArgs[4] = origRightLoaderFileSpec.getFileName();
joinOp.setRightLoaderFuncSpec((new FuncSpec(DefaultIndexableLoader.class.getName(), defaultIndexableLoaderArgs)));
joinOp.setRightInputFileName(origRightLoaderFileSpec.getFileName());
joinOp.setIndexFile(strFile.getFileName());
udfs.add(origRightLoaderFileSpec.getFuncSpec().toString());
}
// We are done with right side. Lets work on left now.
// Join will be materialized in leftTezOper.
if(!curTezOp.isClosed()) // Life is easy
curTezOp.plan.addAsLeaf(joinOp);
else{
int errCode = 2022;
String msg = "Input plan has been closed. This is unexpected while compiling.";
throw new PlanException(msg, errCode, PigException.BUG);
}
if(rightTezOprAggr != null) {
rightTezOprAggr.markIndexer();
// We want to ensure indexing job runs prior to actual join job. So, connect them in order.
TezCompilerUtil.connect(tezPlan, rightTezOprAggr, curTezOp);
}
phyToTezOpMap.put(joinOp, curTezOp);
// no combination of small splits as there is currently no way to guarantee the sortness
// of the combined splits.
curTezOp.noCombineSmallSplits();
curTezOp.UDFs.addAll(udfs);
}
catch(PlanException e){
int errCode = 2034;
String msg = "Error compiling operator " + joinOp.getClass().getCanonicalName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
catch (IOException e){
int errCode = 3000;
String errMsg = "IOException caught while compiling POMergeJoin";
throw new TezCompilerException(errMsg, errCode,e);
}
catch(CloneNotSupportedException e){
int errCode = 2127;
String errMsg = "Cloning exception caught while compiling POMergeJoin";
throw new TezCompilerException(errMsg, errCode, PigException.BUG, e);
}
}
@Override
public void visitNative(PONative op) throws VisitorException {
try{
curTezOp.segmentBelow = true;
TezOperator nativeTezOper = new NativeTezOper(new OperatorKey(scope,nig.getNextNodeId(scope)), op.getNativeMRjar(), op.getParams());
tezPlan.add(nativeTezOper);
curTezOp.setClosed(true);
tezPlan.connect(curTezOp, nativeTezOper);
phyToTezOpMap.put(op, nativeTezOper);
nativeTezOper.setClosed(true);
nativeTezOper.segmentBelow = true;
nativeTezOper.markNative();
curTezOp = nativeTezOper;
}catch(Exception e){
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitPackage(POPackage op) throws VisitorException{
try{
nonBlocking(op);
phyToTezOpMap.put(op, curTezOp);
if (op.getPkgr().getPackageType() == PackageType.JOIN) {
curTezOp.markRegularJoin();
} else if (op.getPkgr().getPackageType() == PackageType.GROUP) {
if (op.getNumInps() == 1) {
curTezOp.markGroupBy();
} else if (op.getNumInps() > 1) {
curTezOp.markCogroup();
}
}
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitPOForEach(POForEach op) throws VisitorException{
try{
nonBlocking(op);
List<PhysicalPlan> plans = op.getInputPlans();
if (plans != null) {
for (PhysicalPlan ep : plans) {
processUDFs(ep);
}
}
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitRank(PORank op) throws VisitorException {
try{
// Rank implementation has 3 vertices
// Vertex 1 has POCounterTez produce output tuples and send to Vertex 3 via 1-1 edge.
// Vertex 1 also sends the count of tuples of each task in Vertex 1 to Vertex 2 which is a single reducer.
// Vertex 3 has PORankTez which consumes from Vertex 2 as broadcast input and also tuples from Vertex 1 and
// produces tuples with updated ranks based on the count of tuples from Vertex 2.
// This is different from MR implementation where POCounter updates job counters, and that is
// copied by JobControlCompiler into the PORank job's jobconf.
// Previous operator is always POCounterTez (Vertex 1)
TezOperator counterOper = curTezOp;
POCounterTez counterTez = (POCounterTez) counterOper.plan.getLeaves().get(0);
//Construct Vertex 2
TezOperator statsOper = getTezOp();
tezPlan.add(statsOper);
POCounterStatsTez counterStatsTez = new POCounterStatsTez(OperatorKey.genOpKey(scope));
statsOper.plan.addAsLeaf(counterStatsTez);
statsOper.setRequestedParallelism(1);
statsOper.setDontEstimateParallelism(true);
//Construct Vertex 3
TezOperator rankOper = getTezOp();
tezPlan.add(rankOper);
PORankTez rankTez = new PORankTez(op);
rankOper.plan.addAsLeaf(rankTez);
curTezOp = rankOper;
// Connect counterOper vertex to rankOper vertex by 1-1 edge
rankOper.setRequestedParallelismByReference(counterOper);
TezEdgeDescriptor edge = TezCompilerUtil.connect(tezPlan, counterOper, rankOper);
rankOper.setUseMRMapSettings(counterOper.isUseMRMapSettings());
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.ONE_TO_ONE);
counterTez.setTuplesOutputKey(rankOper.getOperatorKey().toString());
rankTez.setTuplesInputKey(counterOper.getOperatorKey().toString());
// Connect counterOper vertex to statsOper vertex by Shuffle edge
edge = TezCompilerUtil.connect(tezPlan, counterOper, statsOper);
// Task id
edge.setIntermediateOutputKeyClass(IntWritable.class.getName());
edge.partitionerClass = HashPartitioner.class;
// Number of records in that task
edge.setIntermediateOutputValueClass(LongWritable.class.getName());
counterTez.setStatsOutputKey(statsOper.getOperatorKey().toString());
counterStatsTez.setInputKey(counterOper.getOperatorKey().toString());
// Connect statsOper vertex to rankOper vertex by Broadcast edge
edge = TezCompilerUtil.connect(tezPlan, statsOper, rankOper);
// Map of task id, offset count based on total number of records is in the value
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.BROADCAST);
counterStatsTez.setOutputKey(rankOper.getOperatorKey().toString());
rankTez.setStatsInputKey(statsOper.getOperatorKey().toString());
phyToTezOpMap.put(op, rankOper);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitSkewedJoin(POSkewedJoin op) throws VisitorException {
//TODO: handle split and connect
try {
// The first vertex (prevOp) loads the left table and sends sample of join keys to
// vertex 2 (sampler vertex) and all data to vertex 3 (partition vertex) via 1-1 edge
// LR that transfers loaded input to partition vertex
POLocalRearrangeTez lrTez = new POLocalRearrangeTez(OperatorKey.genOpKey(scope));
// LR that broadcasts sampled input to sampling aggregation vertex
POLocalRearrangeTez lrTezSample = localRearrangeFactory.create(LocalRearrangeType.NULL);
int sampleRate = POPoissonSample.DEFAULT_SAMPLE_RATE;
if (pigProperties.containsKey(PigConfiguration.SAMPLE_RATE)) {
sampleRate = Integer.valueOf(pigProperties.getProperty(PigConfiguration.SAMPLE_RATE));
}
float heapPerc = PartitionSkewedKeys.DEFAULT_PERCENT_MEMUSAGE;
if (pigProperties.containsKey(PigConfiguration.PERC_MEM_AVAIL)) {
heapPerc = Float.valueOf(pigProperties.getProperty(PigConfiguration.PERC_MEM_AVAIL));
}
POPoissonSample poSample = new POPoissonSample(new OperatorKey(scope,nig.getNextNodeId(scope)),
-1, sampleRate, heapPerc);
TezOperator prevOp = compiledInputs[0];
prevOp.plan.addAsLeaf(lrTez);
prevOp.plan.addAsLeaf(poSample);
prevOp.markSampler();
MultiMap<PhysicalOperator, PhysicalPlan> joinPlans = op.getJoinPlans();
List<PhysicalOperator> l = plan.getPredecessors(op);
List<PhysicalPlan> groups = joinPlans.get(l.get(0));
List<Boolean> ascCol = new ArrayList<Boolean>();
for (int i=0; i< groups.size(); i++) {
ascCol.add(false);
}
// Set up transform plan to get keys and memory size of input
// tuples. It first adds all the plans to get key columns.
List<PhysicalPlan> transformPlans = new ArrayList<PhysicalPlan>();
transformPlans.addAll(groups);
// Then it adds a column for memory size
POProject prjStar = new POProject(new OperatorKey(scope,nig.getNextNodeId(scope)));
prjStar.setResultType(DataType.TUPLE);
prjStar.setStar(true);
List<PhysicalOperator> ufInps = new ArrayList<PhysicalOperator>();
ufInps.add(prjStar);
PhysicalPlan ep = new PhysicalPlan();
POUserFunc uf = new POUserFunc(new OperatorKey(scope,nig.getNextNodeId(scope)),
-1, ufInps, new FuncSpec(GetMemNumRows.class.getName(), (String[])null));
uf.setResultType(DataType.TUPLE);
ep.add(uf);
ep.add(prjStar);
ep.connect(prjStar, uf);
transformPlans.add(ep);
List<Boolean> flat1 = new ArrayList<Boolean>();
List<PhysicalPlan> eps1 = new ArrayList<PhysicalPlan>();
for (int i=0; i<transformPlans.size(); i++) {
eps1.add(transformPlans.get(i));
flat1.add(true);
}
// This foreach will pick the sort key columns from the POPoissonSample output
POForEach nfe1 = new POForEach(new OperatorKey(scope,nig.getNextNodeId(scope)),
-1, eps1, flat1);
prevOp.plan.addAsLeaf(nfe1);
prevOp.plan.addAsLeaf(lrTezSample);
prevOp.setClosed(true);
int rp = op.getRequestedParallelism();
if (rp == -1) {
rp = pigContext.defaultParallel;
}
POSort sort = new POSort(op.getOperatorKey(), rp,
null, groups, ascCol, null);
String per = pigProperties.getProperty("pig.skewedjoin.reduce.memusage",
String.valueOf(PartitionSkewedKeys.DEFAULT_PERCENT_MEMUSAGE));
String mc = pigProperties.getProperty("pig.skewedjoin.reduce.maxtuple", "0");
Pair<TezOperator, Integer> sampleJobPair = getSamplingAggregationJob(sort, rp, null,
PartitionSkewedKeysTez.class.getName(), new String[]{per, mc});
rp = sampleJobPair.second;
TezOperator[] joinJobs = new TezOperator[] {null, compiledInputs[1], null};
TezOperator[] joinInputs = new TezOperator[] {compiledInputs[0], compiledInputs[1]};
TezOperator[] rearrangeOutputs = new TezOperator[2];
compiledInputs = new TezOperator[] {joinInputs[0]};
blocking();
// Add a POIdentityInOutTez to the joinJobs[0] which is a partition vertex.
// It just partitions the data from first vertex based on the quantiles from sample vertex.
joinJobs[0] = curTezOp;
try {
lrTez.setIndex(0);
} catch (ExecException e) {
int errCode = 2058;
String msg = "Unable to set index on newly created POLocalRearrange.";
throw new PlanException(msg, errCode, PigException.BUG, e);
}
// Check the type of group keys, if there are more than one field, the key is TUPLE.
byte type = DataType.TUPLE;
if (groups.size() == 1) {
type = groups.get(0).getLeaves().get(0).getResultType();
}
lrTez.setKeyType(type);
lrTez.setPlans(groups);
lrTez.setSkewedJoin(true);
lrTez.setResultType(DataType.TUPLE);
POIdentityInOutTez identityInOutTez = new POIdentityInOutTez(
OperatorKey.genOpKey(scope), lrTez);
identityInOutTez.setInputKey(prevOp.getOperatorKey().toString());
joinJobs[0].plan.addAsLeaf(identityInOutTez);
joinJobs[0].setClosed(true);
joinJobs[0].markSampleBasedPartitioner();
rearrangeOutputs[0] = joinJobs[0];
compiledInputs = new TezOperator[] {joinInputs[1]};
// Run POPartitionRearrange for second join table. Note we set the
// parallelism of POPartitionRearrange to -1, so its parallelism
// will be determined by the size of streaming table.
POPartitionRearrangeTez pr =
new POPartitionRearrangeTez(OperatorKey.genOpKey(scope));
try {
pr.setIndex(1);
} catch (ExecException e) {
int errCode = 2058;
String msg = "Unable to set index on newly created POPartitionRearrange.";
throw new PlanException(msg, errCode, PigException.BUG, e);
}
groups = joinPlans.get(l.get(1));
pr.setPlans(groups);
pr.setKeyType(type);
pr.setSkewedJoin(true);
pr.setResultType(DataType.TUPLE);
joinJobs[1].plan.addAsLeaf(pr);
joinJobs[1].setClosed(true);
rearrangeOutputs[1] = joinJobs[1];
compiledInputs = rearrangeOutputs;
// Create POGlobalRearrange
POGlobalRearrange gr =
new POGlobalRearrange(OperatorKey.genOpKey(scope), rp);
// Skewed join has its own special partitioner
gr.setResultType(DataType.TUPLE);
gr.visit(this);
joinJobs[2] = curTezOp;
joinJobs[2].setRequestedParallelism(rp);
compiledInputs = new TezOperator[] {joinJobs[2]};
// Create POPakcage
POPackage pkg = getPackage(2, type);
pkg.setResultType(DataType.TUPLE);
boolean [] inner = op.getInnerFlags();
pkg.getPkgr().setInner(inner);
pkg.visit(this);
compiledInputs = new TezOperator[] {curTezOp};
// Create POForEach
List<PhysicalPlan> eps = new ArrayList<PhysicalPlan>();
List<Boolean> flat = new ArrayList<Boolean>();
// Add corresponding POProjects
for (int i=0; i < 2; i++) {
ep = new PhysicalPlan();
POProject prj = new POProject(OperatorKey.genOpKey(scope));
prj.setColumn(i+1);
prj.setOverloaded(false);
prj.setResultType(DataType.BAG);
ep.add(prj);
eps.add(ep);
if (!inner[i]) {
// Add an empty bag for outer join
CompilerUtils.addEmptyBagOuterJoin(ep, op.getSchema(i));
}
flat.add(true);
}
POForEach fe =
new POForEach(OperatorKey.genOpKey(scope), -1, eps, flat);
fe.setResultType(DataType.TUPLE);
fe.visit(this);
// Connect vertices
lrTez.setOutputKey(joinJobs[0].getOperatorKey().toString());
lrTezSample.setOutputKey(sampleJobPair.first.getOperatorKey().toString());
identityInOutTez.setOutputKey(joinJobs[2].getOperatorKey().toString());
pr.setOutputKey(joinJobs[2].getOperatorKey().toString());
TezEdgeDescriptor edge = joinJobs[0].inEdges.get(prevOp.getOperatorKey());
joinJobs[0].setUseMRMapSettings(prevOp.isUseMRMapSettings());
// TODO: Convert to unsorted shuffle after TEZ-661
// Use 1-1 edge
edge.dataMovementType = DataMovementType.ONE_TO_ONE;
edge.outputClassName = UnorderedKVOutput.class.getName();
edge.inputClassName = UnorderedKVInput.class.getName();
// If prevOp.requestedParallelism changes based on no. of input splits
// it will reflect for joinJobs[0] so that 1-1 edge will work.
joinJobs[0].setRequestedParallelismByReference(prevOp);
TezCompilerUtil.connect(tezPlan, prevOp, sampleJobPair.first);
POValueOutputTez sampleOut = (POValueOutputTez) sampleJobPair.first.plan.getLeaves().get(0);
for (int i = 0; i < 2; i++) {
joinJobs[i].setSampleOperator(sampleJobPair.first);
// Configure broadcast edges for distribution map
edge = TezCompilerUtil.connect(tezPlan, sampleJobPair.first, joinJobs[i]);
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.BROADCAST);
sampleOut.addOutputKey(joinJobs[i].getOperatorKey().toString());
// Configure skewed partitioner for join
edge = joinJobs[2].inEdges.get(joinJobs[i].getOperatorKey());
edge.partitionerClass = SkewedPartitionerTez.class;
}
joinJobs[2].markSkewedJoin();
sampleJobPair.first.setSortOperator(joinJobs[2]);
if (rp == -1) {
sampleJobPair.first.setNeedEstimatedQuantile(true);
}
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
/**
* Returns a temporary DFS Path
* @return
* @throws IOException
*/
private FileSpec getTempFileSpec() throws IOException {
return new FileSpec(FileLocalizer.getTemporaryPath(pigContext).toString(),
new FuncSpec(Utils.getTmpFileCompressorName(pigContext)));
}
/**
* Force an end to the current vertex with store and sample
* @return Tez operator that now is finished with a store.
* @throws PlanException
*/
private TezOperator endSingleInputWithStoreAndSample(
POSort sort,
POLocalRearrangeTez lr,
POLocalRearrangeTez lrSample,
byte keyType,
Pair<POProject, Byte>[] fields) throws PlanException {
if(compiledInputs.length>1) {
int errCode = 2023;
String msg = "Received a multi input plan when expecting only a single input one.";
throw new PlanException(msg, errCode, PigException.BUG);
}
TezOperator oper = compiledInputs[0];
if (!oper.isClosed()) {
List<PhysicalPlan> eps = new ArrayList<PhysicalPlan>();
if (fields == null) {
// This is project *
PhysicalPlan ep = new PhysicalPlan();
POProject prj = new POProject(new OperatorKey(scope,nig.getNextNodeId(scope)));
prj.setStar(true);
prj.setOverloaded(false);
prj.setResultType(DataType.TUPLE);
ep.add(prj);
eps.add(ep);
} else {
// Attach the sort plans to the local rearrange to get the
// projection.
eps.addAll(sort.getSortPlans());
}
try {
lr.setIndex(0);
} catch (ExecException e) {
int errCode = 2058;
String msg = "Unable to set index on newly created POLocalRearrange.";
throw new PlanException(msg, errCode, PigException.BUG, e);
}
lr.setKeyType((fields == null || fields.length>1) ? DataType.TUPLE : keyType);
lr.setPlans(eps);
lr.setResultType(DataType.TUPLE);
lr.addOriginalLocation(sort.getAlias(), sort.getOriginalLocations());
lr.setOutputKey(curTezOp.getOperatorKey().toString());
oper.plan.addAsLeaf(lr);
List<Boolean> flat1 = new ArrayList<Boolean>();
List<PhysicalPlan> eps1 = new ArrayList<PhysicalPlan>();
Pair<POProject, Byte>[] sortProjs = null;
try{
sortProjs = getSortCols(sort.getSortPlans());
}catch(Exception e) {
throw new RuntimeException(e);
}
// Set up the projections of the key columns
if (sortProjs == null) {
PhysicalPlan ep = new PhysicalPlan();
POProject prj = new POProject(new OperatorKey(scope,
nig.getNextNodeId(scope)));
prj.setStar(true);
prj.setOverloaded(false);
prj.setResultType(DataType.TUPLE);
ep.add(prj);
eps1.add(ep);
flat1.add(false);
} else {
for (Pair<POProject, Byte> sortProj : sortProjs) {
// Check for proj being null, null is used by getSortCols for a non POProject
// operator. Since Order by does not allow expression operators,
//it should never be set to null
if(sortProj == null){
int errCode = 2174;
String msg = "Internal exception. Could not create a sampler job";
throw new PlanException(msg, errCode, PigException.BUG);
}
PhysicalPlan ep = new PhysicalPlan();
POProject prj;
try {
prj = sortProj.first.clone();
} catch (CloneNotSupportedException e) {
//should not get here
throw new AssertionError(
"Error cloning project caught exception" + e
);
}
ep.add(prj);
eps1.add(ep);
flat1.add(false);
}
}
String numSamples = pigContext.getProperties().getProperty(PigConfiguration.PIG_RANDOM_SAMPLER_SAMPLE_SIZE, "100");
POReservoirSample poSample = new POReservoirSample(new OperatorKey(scope,nig.getNextNodeId(scope)),
-1, null, Integer.parseInt(numSamples));
oper.plan.addAsLeaf(poSample);
List<PhysicalPlan> sortPlans = sort.getSortPlans();
// Set up transform plan to get keys and memory size of input
// tuples. It first adds all the plans to get key columns.
List<PhysicalPlan> transformPlans = new ArrayList<PhysicalPlan>();
transformPlans.addAll(sortPlans);
// Then it adds a column for memory size
POProject prjStar = new POProject(new OperatorKey(scope,nig.getNextNodeId(scope)));
prjStar.setResultType(DataType.TUPLE);
prjStar.setStar(true);
List<PhysicalOperator> ufInps = new ArrayList<PhysicalOperator>();
ufInps.add(prjStar);
PhysicalPlan ep = new PhysicalPlan();
POUserFunc uf = new POUserFunc(new OperatorKey(scope,nig.getNextNodeId(scope)),
-1, ufInps, new FuncSpec(GetMemNumRows.class.getName(), (String[])null));
uf.setResultType(DataType.TUPLE);
ep.add(uf);
ep.add(prjStar);
ep.connect(prjStar, uf);
transformPlans.add(ep);
flat1 = new ArrayList<Boolean>();
eps1 = new ArrayList<PhysicalPlan>();
for (int i=0; i<transformPlans.size(); i++) {
eps1.add(transformPlans.get(i));
if (i<sortPlans.size()) {
flat1.add(false);
} else {
flat1.add(true);
}
}
// This foreach will pick the sort key columns from the POPoissonSample output
POForEach nfe1 = new POForEach(new OperatorKey(scope,nig.getNextNodeId(scope)),
-1, eps1, flat1);
oper.plan.addAsLeaf(nfe1);
lrSample.setOutputKey(curTezOp.getOperatorKey().toString());
oper.plan.addAsLeaf(lrSample);
} else {
int errCode = 2022;
String msg = "The current operator is closed. This is unexpected while compiling.";
throw new PlanException(msg, errCode, PigException.BUG);
}
return oper;
}
private Pair<TezOperator,Integer> getOrderbySamplingAggregationJob(
POSort inpSort,
int rp) throws PlanException, VisitorException, ExecException {
POSort sort = new POSort(inpSort.getOperatorKey(), inpSort
.getRequestedParallelism(), null, inpSort.getSortPlans(),
inpSort.getMAscCols(), inpSort.getMSortFunc());
sort.addOriginalLocation(inpSort.getAlias(), inpSort.getOriginalLocations());
// Turn the asc/desc array into an array of strings so that we can pass it
// to the FindQuantiles function.
List<Boolean> ascCols = inpSort.getMAscCols();
String[] ascs = new String[ascCols.size()];
for (int i = 0; i < ascCols.size(); i++) ascs[i] = ascCols.get(i).toString();
// check if user defined comparator is used in the sort, if so
// prepend the name of the comparator as the first fields in the
// constructor args array to the FindQuantiles udf
String[] ctorArgs = ascs;
if(sort.isUDFComparatorUsed) {
String userComparatorFuncSpec = sort.getMSortFunc().getFuncSpec().toString();
ctorArgs = new String[ascs.length + 1];
ctorArgs[0] = USER_COMPARATOR_MARKER + userComparatorFuncSpec;
for(int j = 0; j < ascs.length; j++) {
ctorArgs[j+1] = ascs[j];
}
}
return getSamplingAggregationJob(sort, rp, null, FindQuantilesTez.class.getName(), ctorArgs);
}
/**
* Create a sampling job to collect statistics by sampling input data. The
* sequence of operations is as following:
* <li>Add an extra field "all" into the tuple </li>
* <li>Package all tuples into one bag </li>
* <li>Add constant field for number of reducers. </li>
* <li>Sorting the bag </li>
* <li>Invoke UDF with the number of reducers and the sorted bag.</li>
* <li>Data generated by UDF is transferred via a broadcast edge.</li>
*
* @param sort the POSort operator used to sort the bag
* @param rp configured parallemism
* @param sortKeyPlans PhysicalPlans to be set into POSort operator to get sorting keys
* @param udfClassName the class name of UDF
* @param udfArgs the arguments of UDF
* @return pair<tezoperator[],integer>
* @throws PlanException
* @throws VisitorException
* @throws ExecException
*/
private Pair<TezOperator,Integer> getSamplingAggregationJob(POSort sort, int rp,
List<PhysicalPlan> sortKeyPlans, String udfClassName, String[] udfArgs)
throws PlanException, VisitorException, ExecException {
TezOperator oper = getTezOp();
tezPlan.add(oper);
POPackage pkg = getPackage(1, DataType.BYTEARRAY);
oper.plan.add(pkg);
// Lets start building the plan which will have the sort
// for the foreach
PhysicalPlan fe2Plan = new PhysicalPlan();
// Top level project which just projects the tuple which is coming
// from the foreach after the package
POProject topPrj = new POProject(new OperatorKey(scope,nig.getNextNodeId(scope)));
topPrj.setColumn(1);
topPrj.setResultType(DataType.BAG);
topPrj.setOverloaded(true);
fe2Plan.add(topPrj);
// the projections which will form sort plans
List<PhysicalPlan> nesSortPlanLst = new ArrayList<PhysicalPlan>();
if (sortKeyPlans != null) {
for(int i=0; i<sortKeyPlans.size(); i++) {
nesSortPlanLst.add(sortKeyPlans.get(i));
}
}else{
Pair<POProject, Byte>[] sortProjs = null;
try{
sortProjs = getSortCols(sort.getSortPlans());
}catch(Exception e) {
throw new RuntimeException(e);
}
// Set up the projections of the key columns
if (sortProjs == null) {
PhysicalPlan ep = new PhysicalPlan();
POProject prj = new POProject(new OperatorKey(scope,
nig.getNextNodeId(scope)));
prj.setStar(true);
prj.setOverloaded(false);
prj.setResultType(DataType.TUPLE);
ep.add(prj);
nesSortPlanLst.add(ep);
} else {
for (int i=0; i<sortProjs.length; i++) {
POProject prj =
new POProject(new OperatorKey(scope,nig.getNextNodeId(scope)));
prj.setResultType(sortProjs[i].second);
if(sortProjs[i].first != null && sortProjs[i].first.isProjectToEnd()){
if(i != sortProjs.length -1){
//project to end has to be the last sort column
throw new AssertionError("Project-range to end (x..)" +
" is supported in order-by only as last sort column");
}
prj.setProjectToEnd(i);
break;
}
else{
prj.setColumn(i);
}
prj.setOverloaded(false);
PhysicalPlan ep = new PhysicalPlan();
ep.add(prj);
nesSortPlanLst.add(ep);
}
}
}
sort.setSortPlans(nesSortPlanLst);
sort.setResultType(DataType.BAG);
fe2Plan.add(sort);
fe2Plan.connect(topPrj, sort);
// The plan which will have a constant representing the
// degree of parallelism for the final order by map-reduce job
// this will either come from a "order by parallel x" in the script
// or will be the default number of reducers for the cluster if
// "parallel x" is not used in the script
PhysicalPlan rpep = new PhysicalPlan();
ConstantExpression rpce = new ConstantExpression(new OperatorKey(scope,nig.getNextNodeId(scope)));
rpce.setRequestedParallelism(rp);
// We temporarily set it to rp and will adjust it at runtime, because the final degree of parallelism
// is unknown until we are ready to submit it. See PIG-2779.
rpce.setValue(rp);
rpce.setResultType(DataType.INTEGER);
rpep.add(rpce);
List<PhysicalPlan> genEps = new ArrayList<PhysicalPlan>();
genEps.add(rpep);
genEps.add(fe2Plan);
List<Boolean> flattened2 = new ArrayList<Boolean>();
flattened2.add(false);
flattened2.add(false);
POForEach nfe2 = new POForEach(new OperatorKey(scope,nig.getNextNodeId(scope)),-1, genEps, flattened2);
oper.plan.add(nfe2);
oper.plan.connect(pkg, nfe2);
// Let's connect the output from the foreach containing
// number of quantiles and the sorted bag of samples to
// another foreach with the FindQuantiles udf. The input
// to the FindQuantiles udf is a project(*) which takes the
// foreach input and gives it to the udf
PhysicalPlan ep4 = new PhysicalPlan();
POProject prjStar4 = new POProject(new OperatorKey(scope,nig.getNextNodeId(scope)));
prjStar4.setResultType(DataType.TUPLE);
prjStar4.setStar(true);
ep4.add(prjStar4);
List<PhysicalOperator> ufInps = new ArrayList<PhysicalOperator>();
ufInps.add(prjStar4);
POUserFunc uf = new POUserFunc(new OperatorKey(scope,nig.getNextNodeId(scope)), -1, ufInps,
new FuncSpec(udfClassName, udfArgs));
ep4.add(uf);
ep4.connect(prjStar4, uf);
List<PhysicalPlan> ep4s = new ArrayList<PhysicalPlan>();
ep4s.add(ep4);
List<Boolean> flattened3 = new ArrayList<Boolean>();
flattened3.add(false);
POForEach nfe3 = new POForEach(new OperatorKey(scope,nig.getNextNodeId(scope)), -1, ep4s, flattened3);
oper.plan.add(nfe3);
oper.plan.connect(nfe2, nfe3);
POValueOutputTez sampleOut = new POValueOutputTez(OperatorKey.genOpKey(scope));
oper.plan.add(sampleOut);
oper.plan.connect(nfe3, sampleOut);
oper.setClosed(true);
oper.setRequestedParallelism(1);
oper.setDontEstimateParallelism(true);
oper.markSampleAggregation();
return new Pair<TezOperator, Integer>(oper, rp);
}
private static class FindKeyTypeVisitor extends PhyPlanVisitor {
byte keyType = DataType.UNKNOWN;
FindKeyTypeVisitor(PhysicalPlan plan) {
super(plan,
new DepthFirstWalker<PhysicalOperator, PhysicalPlan>(plan));
}
@Override
public void visitProject(POProject p) throws VisitorException {
keyType = p.getResultType();
}
}
public static Pair<POProject,Byte> [] getSortCols(List<PhysicalPlan> plans) throws PlanException {
if(plans!=null){
@SuppressWarnings("unchecked")
Pair<POProject,Byte>[] ret = new Pair[plans.size()];
int i=-1;
for (PhysicalPlan plan : plans) {
PhysicalOperator op = plan.getLeaves().get(0);
POProject proj;
if (op instanceof POProject) {
if (((POProject)op).isStar()) return null;
proj = (POProject)op;
} else {
proj = null;
}
byte type = op.getResultType();
ret[++i] = new Pair<POProject, Byte>(proj, type);
}
return ret;
}
int errCode = 2026;
String msg = "No expression plan found in POSort.";
throw new PlanException(msg, errCode, PigException.BUG);
}
private TezOperator[] getSortJobs(
TezOperator inputOper,
POLocalRearrangeTez inputOperRearrange,
POSort sort,
byte keyType,
Pair<POProject, Byte>[] fields) throws PlanException{
TezOperator[] opers = new TezOperator[2];
TezOperator oper1 = getTezOp();
tezPlan.add(oper1);
opers[0] = oper1;
POIdentityInOutTez identityInOutTez = new POIdentityInOutTez(
OperatorKey.genOpKey(scope),
inputOperRearrange);
identityInOutTez.setInputKey(inputOper.getOperatorKey().toString());
oper1.plan.addAsLeaf(identityInOutTez);
oper1.setClosed(true);
oper1.markSampleBasedPartitioner();
TezOperator oper2 = getTezOp();
oper2.markGlobalSort();
opers[1] = oper2;
tezPlan.add(oper2);
long limit = sort.getLimit();
boolean[] sortOrder;
List<Boolean> sortOrderList = sort.getMAscCols();
if(sortOrderList != null) {
sortOrder = new boolean[sortOrderList.size()];
for(int i = 0; i < sortOrderList.size(); ++i) {
sortOrder[i] = sortOrderList.get(i);
}
oper2.setSortOrder(sortOrder);
}
identityInOutTez.setOutputKey(oper2.getOperatorKey().toString());
if (limit!=-1) {
POPackage pkg_c = new POPackage(OperatorKey.genOpKey(scope));
pkg_c.setPkgr(new LitePackager());
pkg_c.getPkgr().setKeyType((fields == null || fields.length > 1) ? DataType.TUPLE : keyType);
pkg_c.setNumInps(1);
oper2.inEdges.put(oper1.getOperatorKey(), new TezEdgeDescriptor());
PhysicalPlan combinePlan = oper2.inEdges.get(oper1.getOperatorKey()).combinePlan;
combinePlan.add(pkg_c);
List<PhysicalPlan> eps_c1 = new ArrayList<PhysicalPlan>();
List<Boolean> flat_c1 = new ArrayList<Boolean>();
PhysicalPlan ep_c1 = new PhysicalPlan();
POProject prj_c1 = new POProject(new OperatorKey(scope,nig.getNextNodeId(scope)));
prj_c1.setColumn(1);
prj_c1.setOverloaded(false);
prj_c1.setResultType(DataType.BAG);
ep_c1.add(prj_c1);
eps_c1.add(ep_c1);
flat_c1.add(true);
POForEach fe_c1 = new POForEach(new OperatorKey(scope,nig.getNextNodeId(scope)),
-1, eps_c1, flat_c1);
fe_c1.setResultType(DataType.TUPLE);
combinePlan.addAsLeaf(fe_c1);
POLimit pLimit = new POLimit(new OperatorKey(scope,nig.getNextNodeId(scope)));
pLimit.setLimit(limit);
combinePlan.addAsLeaf(pLimit);
List<PhysicalPlan> eps_c2 = new ArrayList<PhysicalPlan>();
eps_c2.addAll(sort.getSortPlans());
POLocalRearrangeTez lr_c2 = new POLocalRearrangeTez(new OperatorKey(scope,nig.getNextNodeId(scope)));
lr_c2.setOutputKey(oper2.getOperatorKey().toString());
try {
lr_c2.setIndex(0);
} catch (ExecException e) {
int errCode = 2058;
String msg = "Unable to set index on newly created POLocalRearrange.";
throw new PlanException(msg, errCode, PigException.BUG, e);
}
lr_c2.setKeyType((fields.length>1) ? DataType.TUPLE : keyType);
lr_c2.setPlans(eps_c2);
lr_c2.setResultType(DataType.TUPLE);
combinePlan.addAsLeaf(lr_c2);
}
POPackage pkg = new POPackage(OperatorKey.genOpKey(scope));
pkg.setPkgr(new LitePackager());
pkg.getPkgr().setKeyType((fields == null || fields.length > 1) ? DataType.TUPLE : keyType);
pkg.setNumInps(1);
oper2.plan.add(pkg);
PhysicalPlan ep = new PhysicalPlan();
POProject prj = new POProject(new OperatorKey(scope,nig.getNextNodeId(scope)));
prj.setColumn(1);
prj.setOverloaded(false);
prj.setResultType(DataType.BAG);
ep.add(prj);
List<PhysicalPlan> eps2 = new ArrayList<PhysicalPlan>();
eps2.add(ep);
List<Boolean> flattened = new ArrayList<Boolean>();
flattened.add(true);
POForEach nfe1 = new POForEach(new OperatorKey(scope,nig.getNextNodeId(scope)),-1,eps2,flattened);
oper2.plan.add(nfe1);
oper2.plan.connect(pkg, nfe1);
if (limit!=-1) {
POLimit pLimit2 = new POLimit(new OperatorKey(scope,nig.getNextNodeId(scope)));
pLimit2.setLimit(limit);
oper2.plan.addAsLeaf(pLimit2);
}
return opers;
}
@Override
public void visitSort(POSort op) throws VisitorException {
try{
Pair<POProject, Byte>[] fields = getSortCols(op.getSortPlans());
byte keyType = DataType.UNKNOWN;
try {
FindKeyTypeVisitor fktv =
new FindKeyTypeVisitor(op.getSortPlans().get(0));
fktv.visit();
keyType = fktv.keyType;
} catch (VisitorException ve) {
int errCode = 2035;
String msg = "Internal error. Could not compute key type of sort operator.";
throw new PlanException(msg, errCode, PigException.BUG, ve);
}
POLocalRearrangeTez lr = new POLocalRearrangeTez(OperatorKey.genOpKey(scope));
POLocalRearrangeTez lrSample = localRearrangeFactory.create(LocalRearrangeType.NULL);
TezOperator prevOper = endSingleInputWithStoreAndSample(op, lr, lrSample, keyType, fields);
prevOper.markSampler();
int rp = op.getRequestedParallelism();
if (rp == -1) {
rp = pigContext.defaultParallel;
}
// if rp is still -1, let it be, TezParallelismEstimator will set it to an estimated rp
Pair<TezOperator, Integer> quantJobParallelismPair = getOrderbySamplingAggregationJob(op, rp);
TezOperator[] sortOpers = getSortJobs(prevOper, lr, op, keyType, fields);
TezEdgeDescriptor edge = TezCompilerUtil.connect(tezPlan, prevOper, sortOpers[0]);
sortOpers[0].setUseMRMapSettings(prevOper.isUseMRMapSettings());
// Use 1-1 edge
edge.dataMovementType = DataMovementType.ONE_TO_ONE;
edge.outputClassName = UnorderedKVOutput.class.getName();
edge.inputClassName = UnorderedKVInput.class.getName();
// If prevOper.requestedParallelism changes based on no. of input splits
// it will reflect for sortOpers[0] so that 1-1 edge will work.
sortOpers[0].setRequestedParallelismByReference(prevOper);
if (rp==-1) {
quantJobParallelismPair.first.setNeedEstimatedQuantile(true);
}
sortOpers[1].setRequestedParallelism(quantJobParallelismPair.second);
/*
// TODO: Convert to unsorted shuffle after TEZ-661
// edge.outputClassName = UnorderedKVOutput.class.getName();
// edge.inputClassName = UnorderedKVInput.class.getName();
edge.partitionerClass = RoundRobinPartitioner.class;
sortOpers[0].setRequestedParallelism(quantJobParallelismPair.second);
sortOpers[1].setRequestedParallelism(quantJobParallelismPair.second);
*/
TezCompilerUtil.connect(tezPlan, prevOper, quantJobParallelismPair.first);
lr.setOutputKey(sortOpers[0].getOperatorKey().toString());
lrSample.setOutputKey(quantJobParallelismPair.first.getOperatorKey().toString());
edge = TezCompilerUtil.connect(tezPlan, quantJobParallelismPair.first, sortOpers[0]);
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.BROADCAST);
POValueOutputTez sampleOut = (POValueOutputTez)quantJobParallelismPair.first.plan.getLeaves().get(0);
sampleOut.addOutputKey(sortOpers[0].getOperatorKey().toString());
sortOpers[0].setSampleOperator(quantJobParallelismPair.first);
edge = TezCompilerUtil.connect(tezPlan, sortOpers[0], sortOpers[1]);
edge.partitionerClass = WeightedRangePartitionerTez.class;
curTezOp = sortOpers[1];
// TODO: Review sort udf
// if(op.isUDFComparatorUsed){
// curTezOp.UDFs.add(op.getMSortFunc().getFuncSpec().toString());
// curTezOp.isUDFComparatorUsed = true;
// }
quantJobParallelismPair.first.setSortOperator(sortOpers[1]);
// If Order by followed by Limit and parallelism of order by is not 1
// add a new vertex for Limit with parallelism 1.
// Equivalent of LimitAdjuster.java in MR
if (op.isLimited() && rp != 1) {
POValueOutputTez output = new POValueOutputTez(OperatorKey.genOpKey(scope));
output.copyAliasFrom(op);
sortOpers[1].plan.addAsLeaf(output);
TezOperator limitOper = getTezOp();
tezPlan.add(limitOper);
curTezOp = limitOper;
// Explicitly set the parallelism for the new vertex to 1.
limitOper.setRequestedParallelism(1);
limitOper.setDontEstimateParallelism(true);
limitOper.markLimitAfterSort();
edge = TezCompilerUtil.connect(tezPlan, sortOpers[1], limitOper);
// LIMIT in this case should be ordered. So we output unordered with key as task index
// and on the input we use OrderedGroupedKVInput to do ordered merge to retain sorted order.
output.addOutputKey(limitOper.getOperatorKey().toString());
output.setTaskIndexWithRecordIndexAsKey(true);
edge = curTezOp.inEdges.get(sortOpers[1].getOperatorKey());
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.SCATTER_GATHER);
// POValueOutputTez will write key (task index, record index) in
// sorted order. So using UnorderedKVOutput instead of OrderedPartitionedKVOutput.
// But input needs to be merged in sorter order and requires OrderedGroupedKVInput
edge.outputClassName = UnorderedKVOutput.class.getName();
edge.inputClassName = OrderedGroupedKVInput.class.getName();
edge.setIntermediateOutputKeyClass(TezCompilerUtil.TUPLE_CLASS);
edge.setIntermediateOutputKeyComparatorClass(PigTupleWritableComparator.class.getName());
// Then add a POValueInputTez to the start of the new tezOp followed by a LIMIT
POValueInputTez input = new POValueInputTez(OperatorKey.genOpKey(scope));
input.copyAliasFrom(op);
input.setInputKey(sortOpers[1].getOperatorKey().toString());
curTezOp.plan.addAsLeaf(input);
POLimit limit = new POLimit(OperatorKey.genOpKey(scope));
limit.setLimit(op.getLimit());
curTezOp.plan.addAsLeaf(limit);
}
phyToTezOpMap.put(op, curTezOp);
}catch(Exception e){
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitSplit(POSplit op) throws VisitorException {
try {
TezOperator splitOp = curTezOp;
POValueOutputTez output = null;
if (splitsSeen.containsKey(op.getOperatorKey())) {
splitOp = splitsSeen.get(op.getOperatorKey());
output = (POValueOutputTez)splitOp.plan.getLeaves().get(0);
} else {
splitsSeen.put(op.getOperatorKey(), splitOp);
splitOp.setSplitter(true);
phyToTezOpMap.put(op, splitOp);
output = new POValueOutputTez(OperatorKey.genOpKey(scope));
output.copyAliasFrom(op);
splitOp.plan.addAsLeaf(output);
}
curTezOp = getTezOp();
curTezOp.setSplitParent(splitOp.getOperatorKey());
tezPlan.add(curTezOp);
output.addOutputKey(curTezOp.getOperatorKey().toString());
TezEdgeDescriptor edge = TezCompilerUtil.connect(tezPlan, splitOp, curTezOp);
//TODO shared edge once support is available in Tez
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.ONE_TO_ONE);
curTezOp.setRequestedParallelismByReference(splitOp);
POValueInputTez input = new POValueInputTez(OperatorKey.genOpKey(scope));
input.copyAliasFrom(op);
input.setInputKey(splitOp.getOperatorKey().toString());
curTezOp.plan.addAsLeaf(input);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator "
+ op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitStore(POStore op) throws VisitorException {
try {
POStoreTez store = new POStoreTez(op);
nonBlocking(store);
phyToTezOpMap.put(op, curTezOp);
if (store.getSFile()!=null && store.getSFile().getFuncSpec()!=null)
curTezOp.UDFs.add(store.getSFile().getFuncSpec().toString());
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitStream(POStream op) throws VisitorException {
try {
nonBlocking(op);
phyToTezOpMap.put(op, curTezOp);
} catch(Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void visitUnion(POUnion op) throws VisitorException {
try {
// Without VertexGroup (UnionOptimizer), there is an extra union vertex
// which unions input from the two predecessor vertices
TezOperator unionTezOp = getTezOp();
tezPlan.add(unionTezOp);
unionTezOp.markUnion();
unionTezOp.setRequestedParallelism(op.getRequestedParallelism());
POShuffledValueInputTez unionInput = new POShuffledValueInputTez(OperatorKey.genOpKey(scope));
unionTezOp.plan.addAsLeaf(unionInput);
POValueOutputTez[] outputs = new POValueOutputTez[compiledInputs.length];
for (int i = 0; i < compiledInputs.length; i++) {
TezOperator prevTezOp = compiledInputs[i];
// Some predecessors of union need not be part of the union (For eg: replicated join).
// So mark predecessors that are input to the union operation.
unionTezOp.addUnionPredecessor(prevTezOp.getOperatorKey());
TezEdgeDescriptor edge = TezCompilerUtil.connect(tezPlan, prevTezOp, unionTezOp);
TezCompilerUtil.configureValueOnlyTupleOutput(edge, DataMovementType.SCATTER_GATHER);
outputs[i] = new POValueOutputTez(OperatorKey.genOpKey(scope));
outputs[i].addOutputKey(unionTezOp.getOperatorKey().toString());
unionInput.addInputKey(prevTezOp.getOperatorKey().toString());
prevTezOp.plan.addAsLeaf(outputs[i]);
prevTezOp.setClosed(true);
if (prevTezOp.isUseMRMapSettings()) {
unionTezOp.setUseMRMapSettings(true);
}
}
curTezOp = unionTezOp;
phyToTezOpMap.put(op, curTezOp);
} catch (Exception e) {
int errCode = 2034;
String msg = "Error compiling operator " + op.getClass().getSimpleName();
throw new TezCompilerException(msg, errCode, PigException.BUG, e);
}
}
/**
* Returns a POPackage with default packager. This method shouldn't be used
* if special packager such as LitePackager and CombinerPackager is needed.
*/
private POPackage getPackage(int numOfInputs, byte keyType) {
// The default value of boolean is false
boolean[] inner = new boolean[numOfInputs];
POPackage pkg = new POPackage(OperatorKey.genOpKey(scope));
pkg.getPkgr().setInner(inner);
pkg.getPkgr().setKeyType(keyType);
pkg.setNumInps(numOfInputs);
return pkg;
}
private TezOperator getTezOp() {
return new TezOperator(OperatorKey.genOpKey(scope));
}
}