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From "Koji Noguchi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-3148) OutOfMemory exception while spilling stale DefaultDataBag. Extra option to gc() before spilling large bag.
Date Tue, 29 Jan 2013 23:29:13 GMT
Koji Noguchi created PIG-3148:
---------------------------------

             Summary: 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


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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