Koji Noguchi created PIG-3148:
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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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