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https://issues.apache.org/jira/browse/PIG-3148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13578507#comment-13578507
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Koji Noguchi commented on PIG-3148:
-----------------------------------
Thanks Dmitriy, Rohini! I like the fixed ratio suggestion. Is 5% ok? Maybe
10%?
Also, do we still want a configurable flag to enable this feature?
> OutOfMemory exception while spilling stale DefaultDataBag. Extra option to
> gc() before spilling large bag.
> ----------------------------------------------------------------------------------------------------------
>
> Key: PIG-3148
> URL: https://issues.apache.org/jira/browse/PIG-3148
> Project: Pig
> Issue Type: Improvement
> Components: impl
> Reporter: Koji Noguchi
> Assignee: Koji Noguchi
> Attachments: pig-3148-v01.patch
>
>
> Our user reported that one of their jobs in pig 0.10 occasionally failed with
> 'Error: GC overhead limit exceeded' or 'Error: Java heap space', but
> rerunning it sometimes finishes successfully.
> For 1G heap reducer, heap dump showed it contained two huge DefaultDataBag
> with 300-400MBytes each when failing with OOM.
> Jstack at the time of OOM always showed that spill was running.
> {noformat}
> "Low Memory Detector" daemon prio=10 tid=0xb9c11800 nid=0xa52 runnable
> [0xb9afc000]
> java.lang.Thread.State: RUNNABLE
> at java.io.FileOutputStream.writeBytes(Native Method)
> at java.io.FileOutputStream.write(FileOutputStream.java:260)
> at
> java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
> at java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
> - locked <0xe57c6390> (a java.io.BufferedOutputStream)
> at java.io.DataOutputStream.write(DataOutputStream.java:90)
> - locked <0xe57c60b8> (a java.io.DataOutputStream)
> at java.io.FilterOutputStream.write(FilterOutputStream.java:80)
> at org.apache.pig.data.utils.SedesHelper.writeBytes(SedesHelper.java:46)
> at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:537)
> at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:435)
> at
> org.apache.pig.data.utils.SedesHelper.writeGenericTuple(SedesHelper.java:135)
> at org.apache.pig.data.BinInterSedes.writeTuple(BinInterSedes.java:613)
> at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:443)
> at org.apache.pig.data.DefaultDataBag.spill(DefaultDataBag.java:106)
> - locked <0xceb16190> (a java.util.ArrayList)
> at
> org.apache.pig.impl.util.SpillableMemoryManager.handleNotification(SpillableMemoryManager.java:243)
> - locked <0xbeb86318> (a java.util.LinkedList)
> at
> sun.management.NotificationEmitterSupport.sendNotification(NotificationEmitterSupport.java:138)
> at sun.management.MemoryImpl.createNotification(MemoryImpl.java:171)
> at
> sun.management.MemoryPoolImpl$PoolSensor.triggerAction(MemoryPoolImpl.java:272)
> at sun.management.Sensor.trigger(Sensor.java:120)
> {noformat}
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