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From "Mariappan Asokan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5034) Class cast exception in MergeManagerImpl.java
Date Tue, 26 Feb 2013 23:08:13 GMT
Mariappan Asokan created MAPREDUCE-5034:
-------------------------------------------

             Summary: 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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