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https://issues.apache.org/jira/browse/MAPREDUCE-5034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mariappan Asokan resolved MAPREDUCE-5034.
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Resolution: Not A Problem
> Class cast exception in MergeManagerImpl.java
> ---------------------------------------------
>
> Key: MAPREDUCE-5034
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5034
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Mariappan Asokan
>
> When reduce side merge spills to disk, the following exception was thrown:
> 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)
> It looks like a bug introduced by MAPREDUCE-2264
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