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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} -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira