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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4655) MergeManager.reserve can OutOfMemoryError if more than 10% of max memory is used on non-MapOutputs
Date Thu, 13 Sep 2012 18:51:07 GMT
Sandy Ryza created MAPREDUCE-4655:
-------------------------------------

             Summary: 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
            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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