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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.
*/
package org.apache.pig.backend.hadoop.executionengine;
import java.io.IOException;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketImplFactory;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.mapred.JobConf;
import org.apache.pig.ExecType;
import org.apache.pig.PigException;
import org.apache.pig.backend.datastorage.DataStorage;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.datastorage.HDataStorage;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.impl.util.ObjectSerializer;
import org.apache.pig.newplan.Operator;
import org.apache.pig.newplan.logical.optimizer.DanglingNestedNodeRemover;
import org.apache.pig.newplan.logical.optimizer.LogicalPlanOptimizer;
import org.apache.pig.newplan.logical.optimizer.SchemaResetter;
import org.apache.pig.newplan.logical.optimizer.UidResetter;
import org.apache.pig.newplan.logical.relational.LOForEach;
import org.apache.pig.newplan.logical.relational.LogToPhyTranslationVisitor;
import org.apache.pig.newplan.logical.relational.LogicalPlan;
import org.apache.pig.newplan.logical.relational.LogicalRelationalOperator;
import org.apache.pig.newplan.logical.rules.InputOutputFileValidator;
import org.apache.pig.newplan.logical.visitor.SortInfoSetter;
import org.apache.pig.newplan.logical.visitor.StoreAliasSetter;
import org.apache.pig.pen.POOptimizeDisabler;
public class HExecutionEngine {
public static final String JOB_TRACKER_LOCATION = "mapred.job.tracker";
private static final String FILE_SYSTEM_LOCATION = "fs.default.name";
private static final String ALTERNATIVE_FILE_SYSTEM_LOCATION = "fs.defaultFS";
private static final String HADOOP_SITE = "hadoop-site.xml";
private static final String CORE_SITE = "core-site.xml";
private static final String YARN_SITE = "yarn-site.xml";
private final Log log = LogFactory.getLog(getClass());
public static final String LOCAL = "local";
protected PigContext pigContext;
protected DataStorage ds;
@SuppressWarnings("deprecation")
protected JobConf jobConf;
// key: the operator key from the logical plan that originated the physical plan
// val: the operator key for the root of the phyisical plan
protected Map<OperatorKey, OperatorKey> logicalToPhysicalKeys;
// map from LOGICAL key to into about the execution
protected Map<OperatorKey, MapRedResult> materializedResults;
protected Map<Operator, PhysicalOperator> newLogToPhyMap;
private LogicalPlan newPreoptimizedPlan;
public HExecutionEngine(PigContext pigContext) {
this.pigContext = pigContext;
this.logicalToPhysicalKeys = new HashMap<OperatorKey, OperatorKey>();
this.materializedResults = new HashMap<OperatorKey, MapRedResult>();
this.ds = null;
// to be set in the init method
this.jobConf = null;
}
@SuppressWarnings("deprecation")
public JobConf getJobConf() {
return this.jobConf;
}
public Map<OperatorKey, MapRedResult> getMaterializedResults() {
return this.materializedResults;
}
public DataStorage getDataStorage() {
return this.ds;
}
public void init() throws ExecException {
init(this.pigContext.getProperties());
}
@SuppressWarnings("deprecation")
private void init(Properties properties) throws ExecException {
//First set the ssh socket factory
setSSHFactory();
String cluster = null;
String nameNode = null;
// We need to build a configuration object first in the manner described below
// and then get back a properties object to inspect the JOB_TRACKER_LOCATION
// and FILE_SYSTEM_LOCATION. The reason to do this is if we looked only at
// the existing properties object, we may not get the right settings. So we want
// to read the configurations in the order specified below and only then look
// for JOB_TRACKER_LOCATION and FILE_SYSTEM_LOCATION.
// Hadoop by default specifies two resources, loaded in-order from the classpath:
// 1. hadoop-default.xml : Read-only defaults for hadoop.
// 2. hadoop-site.xml: Site-specific configuration for a given hadoop installation.
// Now add the settings from "properties" object to override any existing properties
// All of the above is accomplished in the method call below
JobConf jc = null;
if ( this.pigContext.getExecType() == ExecType.MAPREDUCE ) {
// Check existence of hadoop-site.xml or core-site.xml
Configuration testConf = new Configuration();
ClassLoader cl = testConf.getClassLoader();
URL hadoop_site = cl.getResource( HADOOP_SITE );
URL core_site = cl.getResource( CORE_SITE );
if( hadoop_site == null && core_site == null ) {
throw new ExecException("Cannot find hadoop configurations in classpath (neither hadoop-site.xml nor core-site.xml was found in the classpath)." +
" If you plan to use local mode, please put -x local option in command line",
4010);
}
jc = new JobConf();
jc.addResource("pig-cluster-hadoop-site.xml");
jc.addResource(YARN_SITE);
// Trick to invoke static initializer of DistributedFileSystem to add hdfs-default.xml
// into configuration
new DistributedFileSystem();
//the method below alters the properties object by overriding the
//hadoop properties with the values from properties and recomputing
//the properties
recomputeProperties(jc, properties);
} else {
// If we are running in local mode we dont read the hadoop conf file
jc = new JobConf(false);
jc.addResource("core-default.xml");
jc.addResource("mapred-default.xml");
jc.addResource("yarn-default.xml");
recomputeProperties(jc, properties);
properties.setProperty("mapreduce.framework.name", "local");
properties.setProperty(JOB_TRACKER_LOCATION, LOCAL );
properties.setProperty(FILE_SYSTEM_LOCATION, "file:///");
properties.setProperty(ALTERNATIVE_FILE_SYSTEM_LOCATION, "file:///");
}
cluster = properties.getProperty(JOB_TRACKER_LOCATION);
nameNode = properties.getProperty(FILE_SYSTEM_LOCATION);
if (nameNode==null)
nameNode = (String)pigContext.getProperties().get(ALTERNATIVE_FILE_SYSTEM_LOCATION);
if (cluster != null && cluster.length() > 0) {
if(!cluster.contains(":") && !cluster.equalsIgnoreCase(LOCAL)) {
cluster = cluster + ":50020";
}
properties.setProperty(JOB_TRACKER_LOCATION, cluster);
}
if (nameNode!=null && nameNode.length() > 0) {
if(!nameNode.contains(":") && !nameNode.equalsIgnoreCase(LOCAL)) {
nameNode = nameNode + ":8020";
}
properties.setProperty(FILE_SYSTEM_LOCATION, nameNode);
}
log.info("Connecting to hadoop file system at: " + (nameNode==null? LOCAL: nameNode) ) ;
// constructor sets DEFAULT_REPLICATION_FACTOR_KEY
ds = new HDataStorage(properties);
if(cluster != null && !cluster.equalsIgnoreCase(LOCAL)){
log.info("Connecting to map-reduce job tracker at: " + jc.get(JOB_TRACKER_LOCATION));
}
// Set job-specific configuration knobs
jobConf = jc;
}
public void updateConfiguration(Properties newConfiguration)
throws ExecException {
init(newConfiguration);
}
@SuppressWarnings("unchecked")
public PhysicalPlan compile(LogicalPlan plan,
Properties properties) throws FrontendException {
if (plan == null) {
int errCode = 2041;
String msg = "No Plan to compile";
throw new FrontendException(msg, errCode, PigException.BUG);
}
newPreoptimizedPlan = new LogicalPlan( plan );
if (pigContext.inIllustrator) {
// disable all PO-specific optimizations
POOptimizeDisabler pod = new POOptimizeDisabler( plan );
pod.visit();
}
DanglingNestedNodeRemover DanglingNestedNodeRemover = new DanglingNestedNodeRemover( plan );
DanglingNestedNodeRemover.visit();
UidResetter uidResetter = new UidResetter( plan );
uidResetter.visit();
SchemaResetter schemaResetter = new SchemaResetter( plan, true /*skip duplicate uid check*/ );
schemaResetter.visit();
HashSet<String> optimizerRules = null;
try {
optimizerRules = (HashSet<String>) ObjectSerializer
.deserialize(pigContext.getProperties().getProperty(
"pig.optimizer.rules"));
} catch (IOException ioe) {
int errCode = 2110;
String msg = "Unable to deserialize optimizer rules.";
throw new FrontendException(msg, errCode, PigException.BUG, ioe);
}
if (pigContext.inIllustrator) {
// disable MergeForEach in illustrator
if (optimizerRules == null)
optimizerRules = new HashSet<String>();
optimizerRules.add("MergeForEach");
optimizerRules.add("PartitionFilterOptimizer");
optimizerRules.add("LimitOptimizer");
optimizerRules.add("SplitFilter");
optimizerRules.add("PushUpFilter");
optimizerRules.add("MergeFilter");
optimizerRules.add("PushDownForEachFlatten");
optimizerRules.add("ColumnMapKeyPrune");
optimizerRules.add("AddForEach");
optimizerRules.add("GroupByConstParallelSetter");
}
StoreAliasSetter storeAliasSetter = new StoreAliasSetter( plan );
storeAliasSetter.visit();
// run optimizer
LogicalPlanOptimizer optimizer = new LogicalPlanOptimizer( plan, 100, optimizerRules );
optimizer.optimize();
// compute whether output data is sorted or not
SortInfoSetter sortInfoSetter = new SortInfoSetter( plan );
sortInfoSetter.visit();
if (!pigContext.inExplain) {
// Validate input/output file. Currently no validation framework in
// new logical plan, put this validator here first.
// We might decide to move it out to a validator framework in future
InputOutputFileValidator validator = new InputOutputFileValidator( plan, pigContext );
validator.validate();
}
// translate new logical plan to physical plan
LogToPhyTranslationVisitor translator = new LogToPhyTranslationVisitor( plan );
translator.setPigContext(pigContext);
translator.visit();
newLogToPhyMap = translator.getLogToPhyMap();
return translator.getPhysicalPlan();
}
public Map<Operator, PhysicalOperator> getLogToPhyMap() {
return newLogToPhyMap;
}
public Map<LOForEach, Map<LogicalRelationalOperator, PhysicalOperator>> getForEachInnerLogToPhyMap(LogicalPlan plan) {
Map<LOForEach, Map<LogicalRelationalOperator, PhysicalOperator>> result =
new HashMap<LOForEach, Map<LogicalRelationalOperator, PhysicalOperator>>();
Iterator<Operator> outerIter = plan.getOperators();
while (outerIter.hasNext()) {
Operator oper = outerIter.next();
if (oper instanceof LOForEach) {
LogicalPlan innerPlan = ((LOForEach) oper).getInnerPlan();
Map<LogicalRelationalOperator, PhysicalOperator> innerOpMap = new HashMap<LogicalRelationalOperator, PhysicalOperator>();
Iterator<Operator> innerIter = innerPlan.getOperators();
while (innerIter.hasNext()) {
Operator innerOper = innerIter.next();
innerOpMap.put(((LogicalRelationalOperator)innerOper), newLogToPhyMap.get(innerOper));
}
result.put((LOForEach) oper, innerOpMap);
}
}
return result;
}
public LogicalPlan getNewPlan() {
return newPreoptimizedPlan;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private void setSSHFactory(){
Properties properties = this.pigContext.getProperties();
String g = properties.getProperty("ssh.gateway");
if (g == null || g.length() == 0) return;
try {
Class clazz = Class.forName("org.apache.pig.shock.SSHSocketImplFactory");
SocketImplFactory f = (SocketImplFactory)clazz.getMethod("getFactory", new Class[0]).invoke(0, new Object[0]);
Socket.setSocketImplFactory(f);
}
catch (SocketException e) {}
catch (Exception e){
throw new RuntimeException(e);
}
}
/**
* Method to apply pig properties to JobConf
* (replaces properties with resulting jobConf values)
* @param conf JobConf with appropriate hadoop resource files
* @param properties Pig properties that will override hadoop properties; properties might be modified
*/
@SuppressWarnings("deprecation")
private void recomputeProperties(JobConf jobConf, Properties properties) {
// We need to load the properties from the hadoop configuration
// We want to override these with any existing properties we have.
if (jobConf != null && properties != null) {
// set user properties on the jobConf to ensure that defaults
// and deprecation is applied correctly
Enumeration<Object> propertiesIter = properties.keys();
while (propertiesIter.hasMoreElements()) {
String key = (String) propertiesIter.nextElement();
String val = properties.getProperty(key);
// We do not put user.name, See PIG-1419
if (!key.equals("user.name"))
jobConf.set(key, val);
}
//clear user defined properties and re-populate
properties.clear();
Iterator<Map.Entry<String, String>> iter = jobConf.iterator();
while (iter.hasNext()) {
Map.Entry<String, String> entry = iter.next();
properties.put(entry.getKey(), entry.getValue());
}
}
}
}