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* 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.
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package org.apache.pig.backend.hadoop.executionengine.tez.runtime;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.pig.JVMReuseImpl;
import org.apache.pig.PigConstants;
import org.apache.pig.PigException;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MRConfiguration;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigHadoopLogger;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.UDFFinishVisitor;
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.Result;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.util.PlanHelper;
import org.apache.pig.backend.hadoop.executionengine.shims.HadoopShims;
import org.apache.pig.backend.hadoop.executionengine.tez.plan.udf.ReadScalarsTez;
import org.apache.pig.data.SchemaTupleBackend;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.plan.DependencyOrderWalker;
import org.apache.pig.impl.plan.VisitorException;
import org.apache.pig.impl.util.ObjectSerializer;
import org.apache.pig.impl.util.UDFContext;
import org.apache.pig.tools.pigstats.PigStatusReporter;
import org.apache.tez.common.TezUtils;
import org.apache.tez.dag.api.UserPayload;
import org.apache.tez.mapreduce.output.MROutput;
import org.apache.tez.runtime.api.AbstractLogicalIOProcessor;
import org.apache.tez.runtime.api.Event;
import org.apache.tez.runtime.api.LogicalInput;
import org.apache.tez.runtime.api.LogicalOutput;
import org.apache.tez.runtime.api.ProcessorContext;
import org.apache.tez.runtime.api.events.VertexManagerEvent;
import org.apache.tez.runtime.library.api.KeyValueReader;
import com.google.common.collect.Lists;
import com.google.common.primitives.Ints;
public class PigProcessor extends AbstractLogicalIOProcessor {
private static final Log LOG = LogFactory.getLog(PigProcessor.class);
// Names of the properties that store serialized physical plans
public static final String PLAN = "pig.exec.tez.plan";
public static final String COMBINE_PLAN = "pig.exec.tez.combine.plan";
// This flag is used in both order by and skewed job. This is a configuration
// entry to instruct sample job to dynamically estimate parallelism
public static final String ESTIMATE_PARALLELISM = "pig.exec.estimate.parallelism";
// This flag is used in both order by and skewed job.
// This is the key in sampleMap of estimated parallelism
public static final String ESTIMATED_NUM_PARALLELISM = "pig.exec.estimated.num.parallelism";
// The operator key for sample vertex, used by partition vertex to collect sample
public static final String SAMPLE_VERTEX = "pig.sampleVertex";
// The operator key for sort vertex, used by sample vertex to send parallelism event
// if Pig need to estimate parallelism of sort vertex
public static final String SORT_VERTEX = "pig.sortVertex";
private PhysicalPlan execPlan;
private Set<MROutput> fileOutputs = new HashSet<MROutput>();
private PhysicalOperator leaf;
private Configuration conf;
private PigHadoopLogger pigHadoopLogger;
public static String sampleVertex;
public static Map<String, Object> sampleMap;
public PigProcessor(ProcessorContext context) {
super(context);
}
@SuppressWarnings("unchecked")
@Override
public void initialize() throws Exception {
// Reset any static variables to avoid conflict in container-reuse.
sampleVertex = null;
sampleMap = null;
// Reset static variables cleared for avoiding OOM.
new JVMReuseImpl().cleanupStaticData();
UserPayload payload = getContext().getUserPayload();
conf = TezUtils.createConfFromUserPayload(payload);
PigContext.setPackageImportList((ArrayList<String>) ObjectSerializer
.deserialize(conf.get("udf.import.list")));
PigContext pc = (PigContext) ObjectSerializer.deserialize(conf.get("pig.pigContext"));
// To determine front-end in UDFContext
conf.set(MRConfiguration.JOB_APPLICATION_ATTEMPT_ID, getContext().getUniqueIdentifier());
conf.set(PigConstants.TASK_INDEX, Integer.toString(getContext().getTaskIndex()));
UDFContext.getUDFContext().addJobConf(conf);
UDFContext.getUDFContext().deserialize();
String execPlanString = conf.get(PLAN);
execPlan = (PhysicalPlan) ObjectSerializer.deserialize(execPlanString);
SchemaTupleBackend.initialize(conf, pc);
PigMapReduce.sJobContext = HadoopShims.createJobContext(conf, new org.apache.hadoop.mapreduce.JobID());
// Set the job conf as a thread-local member of PigMapReduce
// for backwards compatibility with the existing code base.
PigMapReduce.sJobConfInternal.set(conf);
boolean aggregateWarning = "true".equalsIgnoreCase(pc.getProperties().getProperty("aggregate.warning"));
PigStatusReporter pigStatusReporter = PigStatusReporter.getInstance();
pigStatusReporter.setContext(new TezTaskContext(getContext()));
pigHadoopLogger = PigHadoopLogger.getInstance();
pigHadoopLogger.setReporter(pigStatusReporter);
pigHadoopLogger.setAggregate(aggregateWarning);
PhysicalOperator.setPigLogger(pigHadoopLogger);
LinkedList<TezTaskConfigurable> tezTCs = PlanHelper.getPhysicalOperators(execPlan, TezTaskConfigurable.class);
for (TezTaskConfigurable tezTC : tezTCs){
tezTC.initialize(getContext());
}
}
@Override
public void handleEvents(List<Event> processorEvents) {
// TODO Auto-generated method stub
}
@Override
public void close() throws Exception {
execPlan = null;
fileOutputs = null;
leaf = null;
conf = null;
sampleMap = null;
sampleVertex = null;
pigHadoopLogger = null;
// Avoid memory leak. ThreadLocals especially leak a lot of memory.
// The Reporter and Context objects hold TezProcessorContextImpl
// which holds input and its sort buffers which are huge.
new JVMReuseImpl().cleanupStaticData();
}
@Override
public void run(Map<String, LogicalInput> inputs,
Map<String, LogicalOutput> outputs) throws Exception {
try {
initializeInputs(inputs);
initializeOutputs(outputs);
List<PhysicalOperator> leaves = null;
if (!execPlan.isEmpty()) {
leaves = execPlan.getLeaves();
// TODO: Pull from all leaves when there are multiple leaves/outputs
leaf = leaves.get(0);
}
runPipeline(leaf);
// Calling EvalFunc.finish()
UDFFinishVisitor finisher = new UDFFinishVisitor(execPlan,
new DependencyOrderWalker<PhysicalOperator, PhysicalPlan>(
execPlan));
try {
finisher.visit();
} catch (VisitorException e) {
int errCode = 2121;
String msg = "Error while calling finish method on UDFs.";
throw new VisitorException(msg, errCode, PigException.BUG, e);
}
while (!getContext().canCommit()) {
Thread.sleep(100);
}
for (MROutput fileOutput : fileOutputs){
fileOutput.flush();
if (fileOutput.isCommitRequired()) {
fileOutput.commit();
}
}
// send event containing parallelism to sorting job of order by / skewed join
if (conf.getBoolean(ESTIMATE_PARALLELISM, false)) {
int parallelism = 1;
if (sampleMap!=null && sampleMap.containsKey(ESTIMATED_NUM_PARALLELISM)) {
parallelism = (Integer)sampleMap.get(ESTIMATED_NUM_PARALLELISM);
}
String sortingVertex = conf.get(SORT_VERTEX);
// Should contain only 1 output for sampleAggregation job
LOG.info("Sending numParallelism " + parallelism + " to " + sortingVertex);
VertexManagerEvent vmEvent = VertexManagerEvent.create(
sortingVertex, ByteBuffer.wrap(Ints.toByteArray(parallelism)));
List<Event> events = Lists.newArrayListWithCapacity(1);
events.add(vmEvent);
getContext().sendEvents(events);
}
} catch (Exception e) {
abortOutput();
LOG.error("Encountered exception while processing: ", e);
throw e;
}
}
private void abortOutput() {
for (MROutput fileOutput : fileOutputs){
try {
fileOutput.abort();
} catch (IOException e) {
LOG.error("Encountered exception while aborting output", e);
}
}
}
private void initializeInputs(Map<String, LogicalInput> inputs)
throws Exception {
Set<String> inputsToSkip = new HashSet<String>();
sampleVertex = conf.get("pig.sampleVertex");
if (sampleVertex != null) {
collectSample(sampleVertex, inputs.get(sampleVertex));
inputsToSkip.add(sampleVertex);
}
LinkedList<TezInput> tezInputs = PlanHelper.getPhysicalOperators(execPlan, TezInput.class);
for (TezInput tezInput : tezInputs){
tezInput.addInputsToSkip(inputsToSkip);
}
LinkedList<ReadScalarsTez> scalarInputs = new LinkedList<ReadScalarsTez>();
for (POUserFunc userFunc : PlanHelper.getPhysicalOperators(execPlan, POUserFunc.class) ) {
if (userFunc.getFunc() instanceof ReadScalarsTez) {
scalarInputs.add((ReadScalarsTez)userFunc.getFunc());
}
}
for (ReadScalarsTez scalarInput: scalarInputs) {
scalarInput.addInputsToSkip(inputsToSkip);
}
for (Entry<String, LogicalInput> entry : inputs.entrySet()) {
if (inputsToSkip.contains(entry.getKey())) {
LOG.info("Skipping fetch of input " + entry.getValue() + " from vertex " + entry.getKey());
} else {
LOG.info("Starting fetch of input " + entry.getValue() + " from vertex " + entry.getKey());
entry.getValue().start();
}
}
for (TezInput tezInput : tezInputs){
tezInput.attachInputs(inputs, conf);
}
for (ReadScalarsTez scalarInput: scalarInputs) {
scalarInput.attachInputs(inputs, conf);
}
}
private void initializeOutputs(Map<String, LogicalOutput> outputs) throws Exception {
for (Entry<String, LogicalOutput> entry : outputs.entrySet()) {
LogicalOutput output = entry.getValue();
LOG.info("Starting output " + output + " to vertex " + entry.getKey());
output.start();
if (output instanceof MROutput){
MROutput mrOut = (MROutput) output;
fileOutputs.add(mrOut);
}
}
LinkedList<TezOutput> tezOuts = PlanHelper.getPhysicalOperators(execPlan, TezOutput.class);
for (TezOutput tezOut : tezOuts){
tezOut.attachOutputs(outputs, conf);
}
}
protected void runPipeline(PhysicalOperator leaf) throws IOException, InterruptedException {
while(true){
Result res = leaf.getNextTuple();
if(res.returnStatus==POStatus.STATUS_OK){
continue;
}
if(res.returnStatus==POStatus.STATUS_EOP) {
return;
}
if(res.returnStatus==POStatus.STATUS_NULL)
continue;
if(res.returnStatus==POStatus.STATUS_ERR){
String errMsg;
if(res.result != null) {
errMsg = "Received Error while " +
"processing the map plan: " + res.result;
} else {
errMsg = "Received Error while " +
"processing the map plan.";
}
int errCode = 2055;
ExecException ee = new ExecException(errMsg, errCode, PigException.BUG);
throw ee;
}
}
}
@SuppressWarnings({ "unchecked" })
private void collectSample(String sampleVertex, LogicalInput logicalInput) throws Exception {
String quantileMapCacheKey = "sample-" + sampleVertex + ".quantileMap";
sampleMap = (Map<String, Object>)ObjectCache.getInstance().retrieve(quantileMapCacheKey);
if (sampleMap != null) {
return;
}
LOG.info("Starting fetch of input " + logicalInput + " from vertex " + sampleVertex);
logicalInput.start();
KeyValueReader reader = (KeyValueReader) logicalInput.getReader();
reader.next();
Object val = reader.getCurrentValue();
if (val != null) {
// Sample is not empty
Tuple t = (Tuple) val;
sampleMap = (Map<String, Object>) t.get(0);
ObjectCache.getInstance().cache(quantileMapCacheKey, sampleMap);
} else {
LOG.warn("Cannot fetch sample from " + sampleVertex);
}
}
}