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https://issues.apache.org/jira/browse/MAPREDUCE-5028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657505#comment-13657505
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Gopal V commented on MAPREDUCE-5028:
------------------------------------

HADOOP_CLASSPATH=./hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/target/hadoop-mapreduce-client-jobclient-2.0.5-SNAPSHOT-tests.jar
 hadoop  org.apache.hadoop.mapreduce.LargeSorter -D io.sort.mb=1280  -D 
mapreduce.map.memory.mb=3072 -D mapred.map.child.java.opts="-server  -Xmx2248m 
-Djava.net.preferIPv4Stack=true" /tmp/q.$RANDOM -r 2 

ran with extra logging

2013-05-14 20:52:52,911 INFO [main] org.apache.hadoop.mapred.MapTask: Starting 
flush of map output
2013-05-14 20:52:56,794 INFO [SpillThread] org.apache.hadoop.mapred.MapTask: 
Finished spill 0
2013-05-14 20:52:56,795 INFO [main] org.apache.hadoop.mapred.MapTask: kvstart, 
kvend = int(-134521988) or long(268131196)


                
> 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, 2.0.5-beta
>
>         Attachments: mr-5028-branch1.patch, mr-5028-branch1.patch, 
> mr-5028-branch1.patch, MR-5028_testapp.patch, mr-5028-trunk.patch, 
> mr-5028-trunk.patch, mr-5028-trunk.patch, repro-mr-5028.patch
>
>
> 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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