Fabrizio Massara created PIG-5116:
-------------------------------------
Summary: Pig Job failed because ConcurrentModificationException()
arised
Key: PIG-5116
URL: https://issues.apache.org/jira/browse/PIG-5116
Project: Pig
Issue Type: Bug
Affects Versions: 0.16.0
Environment: Mac OSX 10.11.6 El Capitan
Reporter: Fabrizio Massara
Hello, I'm trying to run a Pig Job that have to do a FULL Join over two large
datasets. I'm running in local mode and I'm testing it on a very limited part
of the datasets.
I started with a LIMIT of 5000 and it worked, after that I tried with a LIMIT
of 10000 and the job failed. It arised this error:
2017-01-27 10:56:14,197 [Thread-1516] WARN
org.apache.hadoop.mapred.LocalJobRunner - job_local1966159905_0005
java.lang.Exception: java.io.IOException: java.io.IOException:
java.util.ConcurrentModificationException
at
org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:529)
Caused by: java.io.IOException: java.io.IOException:
java.util.ConcurrentModificationException
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:470)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.processOnePackageOutput(PigGenericMapReduce.java:433)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:413)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:262)
at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171)
at
org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389)
at
org.apache.hadoop.mapred.LocalJobRunner$Job$ReduceTaskRunnable.run(LocalJobRunner.java:319)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: java.util.ConcurrentModificationException
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.StoreFuncDecorator.putNext(StoreFuncDecorator.java:83)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:144)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:97)
at
org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:558)
at
org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
at
org.apache.hadoop.mapreduce.lib.reduce.WrappedReducer$Context.write(WrappedReducer.java:105)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:468)
... 12 more
Caused by: java.util.ConcurrentModificationException
at java.util.Hashtable$Enumerator.next(Hashtable.java:1367)
at org.apache.pig.data.BinInterSedes.writeMap(BinInterSedes.java:616)
at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:478)
at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:462)
at
org.apache.pig.data.utils.SedesHelper.writeGenericTuple(SedesHelper.java:135)
at org.apache.pig.data.BinInterSedes.writeTuple(BinInterSedes.java:650)
at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:470)
at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:462)
at
org.apache.pig.impl.io.InterRecordWriter.write(InterRecordWriter.java:73)
at org.apache.pig.impl.io.InterStorage.putNext(InterStorage.java:88)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.StoreFuncDecorator.putNext(StoreFuncDecorator.java:75)
... 18 more
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