[PIG-4104] Accumulator UDF throws OOM in Tez

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.14.0
• Component/s: tez
• Hadoop Flags: Reviewed
• Assignee: Rohini Palaniswamy
• Reporter: Cheolsoo Park
• Created: 05/Aug/14 15:19
• Updated: 21/Nov/14 05:58
• Resolved: 15/Sep/14 16:24

Description

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-

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)

Issue Links

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