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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-4655) MergeManager.reserve can OutOfMemoryError if more than 10% of max memory is used on non-MapOutputs
Date Thu, 03 Jan 2013 19:48:13 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Sandy Ryza resolved MAPREDUCE-4655.

    Resolution: Invalid
> MergeManager.reserve can OutOfMemoryError if more than 10% of max memory is used on non-MapOutputs
> --------------------------------------------------------------------------------------------------
>                 Key: MAPREDUCE-4655
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4655
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.0.1-alpha
>            Reporter: Sandy Ryza
> The MergeManager does a memory check, using a limit that defaults to 90% of Runtime.getRuntime().maxMemory().
Allocations that would bring the total memory allocated by the MergeManager over this limit
are asked to wait until memory frees up. Disk is used for single allocations that would be
over 25% of the memory limit.
> If some other part of the reducer were to be using more than 10% of the memory. the current
check wouldn't stop an OutOfMemoryError.
> Before creating an in-memory MapOutput, a check can be done using Runtime.getRuntime().freeMemory(),
waiting until memory is freed up if it fails.
> 12/08/17 10:36:29 INFO mapreduce.Job: Task Id : attempt_1342723342632_0010_r_000005_0,
Status : FAILED 
> Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle
in fetcher#6 
> at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:123) 
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:371) 
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:152) 
> at java.security.AccessController.doPrivileged(Native Method) 
> at javax.security.auth.Subject.doAs(Subject.java:416) 
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232)

> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:147) 
> Caused by: java.lang.OutOfMemoryError: Java heap space 
> at org.apache.hadoop.io.BoundedByteArrayOutputStream.<init>(BoundedByteArrayOutputStream.java:58)

> at org.apache.hadoop.io.BoundedByteArrayOutputStream.<init>(BoundedByteArrayOutputStream.java:45)

> at org.apache.hadoop.mapreduce.task.reduce.MapOutput.<init>(MapOutput.java:97)

> at org.apache.hadoop.mapreduce.task.reduce.MergeManager.unconditionalReserve(MergeManager.java:286)

> at org.apache.hadoop.mapreduce.task.reduce.MergeManager.reserve(MergeManager.java:276)

> at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyMapOutput(Fetcher.java:327) 
> at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:273) 
> at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:153)

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