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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5028) Maps fail when io.sort.mb is set to high value
Date Wed, 20 Mar 2013 06:05:15 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607322#comment-13607322
] 

Hadoop QA commented on MAPREDUCE-5028:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12574490/mr-5028-trunk.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3440//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3440//console

This message is automatically generated.
                
> 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: 1.1.1, 2.0.3-alpha, 0.23.5
>            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, 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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