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Date: Tue, 19 Mar 2013 20:41:17 +0000 (UTC)
From: "Karthik Kambatla (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Message-ID: <JIRA.12634050.1361850865994.14180.1363725677893@arcas>
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Subject: [jira] [Updated] (MAPREDUCE-5028) Maps fail when io.sort.mb is set
 to high value
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-5028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karthik Kambatla updated MAPREDUCE-5028:
----------------------------------------

    Status: Patch Available  (was: Reopened)
    
> Maps fail when io.sort.mb is set to high value
> ----------------------------------------------
>
>                 Key: MAPREDUCE-5028
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5028
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.23.5, 2.0.3-alpha, 1.1.1
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>            Priority: Critical
>             Fix For: 1.2.0, 0.23.7, 2.0.5-beta
>
>         Attachments: mr-5028-branch1.patch, mr-5028-branch1.patch, mr-5028-branch1.patch, mr-5028-trunk.patch, mr-5028-trunk.patch, org.apache.hadoop.mapreduce.v2.TestMRJobs-output.txt
>
>
> Verified the problem exists on branch-1 with the following configuration:
> Pseudo-dist mode: 2 maps/ 1 reduce, mapred.child.java.opts=-Xmx2048m, io.sort.mb=1280, dfs.block.size=2147483648
> Run teragen to generate 4 GB data
> Maps fail when you run wordcount on this configuration with the following error: 
> {noformat}
> java.io.IOException: Spill failed
> 	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:1031)
> 	at org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:692)
> 	at org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
> 	at org.apache.hadoop.examples.WordCount$TokenizerMapper.map(WordCount.java:45)
> 	at org.apache.hadoop.examples.WordCount$TokenizerMapper.map(WordCount.java:34)
> 	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
> 	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:766)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
> 	at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at javax.security.auth.Subject.doAs(Subject.java:396)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
> 	at org.apache.hadoop.mapred.Child.main(Child.java:249)
> Caused by: java.io.EOFException
> 	at java.io.DataInputStream.readInt(DataInputStream.java:375)
> 	at org.apache.hadoop.io.IntWritable.readFields(IntWritable.java:38)
> 	at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:67)
> 	at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:40)
> 	at org.apache.hadoop.mapreduce.ReduceContext.nextKeyValue(ReduceContext.java:116)
> 	at org.apache.hadoop.mapreduce.ReduceContext.nextKey(ReduceContext.java:92)
> 	at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:175)
> 	at org.apache.hadoop.mapred.Task$NewCombinerRunner.combine(Task.java:1505)
> 	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1438)
> 	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.access$1800(MapTask.java:855)
> 	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer$SpillThread.run(MapTask.java:1346)
> {noformat}

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