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https://issues.apache.org/jira/browse/PIG-4104?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rohini Palaniswamy resolved PIG-4104.
-------------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Committed to trunk. Thanks for reviewing and trying it out Cheolsoo.
> Accumulator UDF throws OOM in Tez
> ---------------------------------
>
> Key: PIG-4104
> URL: https://issues.apache.org/jira/browse/PIG-4104
> Project: Pig
> Issue Type: Sub-task
> Components: tez
> Reporter: Cheolsoo Park
> Assignee: Rohini Palaniswamy
> Fix For: 0.14.0
>
> Attachments: PIG-4104-2.patch
>
>
> This is somewhat expected since we copy lots of object in POShuffleLoadTez
> for accumulator UDF. With large data, it consistently fails with OOM. We need
> to re-implement it.
> Here is an example stack trace-
> {code}
> 2014-08-02 02:59:15,801 ERROR [TezChild]
> org.apache.tez.runtime.task.TezTaskRunner: Exception of type Error. Exiting
> now
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> at java.lang.StringCoding$StringDecoder.decode(StringCoding.java:149)
> at java.lang.StringCoding.decode(StringCoding.java:193)
> at java.lang.String.<init>(String.java:416)
> at
> org.apache.pig.data.BinInterSedes$BinInterSedesTupleRawComparator.compareBinInterSedesDatum(BinInterSedes.java:964)
> at
> org.apache.pig.data.BinInterSedes$BinInterSedesTupleRawComparator.compareBinSedesTuple(BinInterSedes.java:770)
> at
> org.apache.pig.data.BinInterSedes$BinInterSedesTupleRawComparator.compare(BinInterSedes.java:728)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigTupleSortComparator.compare(PigTupleSortComparator.java:100)
> at
> org.apache.tez.runtime.library.common.sort.impl.TezMerger$MergeQueue.lessThan(TezMerger.java:539)
> at org.apache.hadoop.util.PriorityQueue.downHeap(PriorityQueue.java:144)
> at org.apache.hadoop.util.PriorityQueue.adjustTop(PriorityQueue.java:108)
> at
> org.apache.tez.runtime.library.common.sort.impl.TezMerger$MergeQueue.adjustPriorityQueue(TezMerger.java:486)
> at
> org.apache.tez.runtime.library.common.sort.impl.TezMerger$MergeQueue.next(TezMerger.java:503)
> at
> org.apache.tez.runtime.library.common.ValuesIterator.readNextKey(ValuesIterator.java:179)
> at
> org.apache.tez.runtime.library.common.ValuesIterator.access$300(ValuesIterator.java:45)
> at
> org.apache.tez.runtime.library.common.ValuesIterator$1$1.next(ValuesIterator.java:138)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.POShuffleTezLoad.getNextTuple(POShuffleTezLoad.java:176)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:301)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNextTuple(POForEach.java:242)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:301)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNextTuple(POForEach.java:242)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:301)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNextTuple(POForEach.java:242)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:301)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.POStoreTez.getNextTuple(POStoreTez.java:113)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor.runPipeline(PigProcessor.java:313)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor.run(PigProcessor.java:196)
> at
> org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:324)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:180)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:172)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
> {code}
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