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From "Mariappan Asokan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5034) Class cast exception in MergeManagerImpl.java
Date Tue, 26 Feb 2013 23:36:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587738#comment-13587738
] 

Mariappan Asokan commented on MAPREDUCE-5034:
---------------------------------------------

Hi Sandy,
  You are right.  It is from a previous version of the patch.  Sorry, about the confusion.
 I will reject this Jira.

-- Asokan
                
> 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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