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https://issues.apache.org/jira/browse/MAPREDUCE-5271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13666300#comment-13666300
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Jason Lowe commented on MAPREDUCE-5271:
---------------------------------------
This looks to be the same issue reported in MAPREDUCE-5034 and MAPREDUCE-4965.
The problem has since been fixed by having {{CompressAwarePath}} extend
{{Path}}.
> Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in
> shuffle in InMemoryMerger - Thread to merge in-memory shuffled map-outputs
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5271
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5271
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 2.0.0-alpha
> Environment: linux 64
> Reporter: lijuanhzou
> Assignee: lijuanhzou
> Labels: hadoop
>
> (hadoop-2.0.0-cdh4.2.0)I encounter following question when do a simple
> words-count working.small input data is ok,there is problem when using big
> datas:
> Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in
> shuffle in InMemoryMerger - Thread to merge in-memory shuffled map-outputs
> at
> org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:121)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:379)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:157)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1408)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:152)
> Caused by: java.lang.ClassCastException:
> org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl$CompressAwarePath
> cannot be cast to java.lang.Comparable
> at java.util.TreeMap.put(TreeMap.java:542)
> at java.util.TreeSet.add(TreeSet.java:238)
> at
> org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.closeOnDiskFile(MergeManagerImpl.java:340)
> at
> org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl$InMemoryMerger.merge(MergeManagerImpl.java:495)
> at
> org.apache.hadoop.mapreduce.task.reduce.MergeThread.run(MergeThread.java:94)
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