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Posted to mapreduce-issues@hadoop.apache.org by "Mariappan Asokan (JIRA)" <ji...@apache.org> on 2013/02/27 00:08:13 UTC

[jira] [Created] (MAPREDUCE-5034) Class cast exception in MergeManagerImpl.java

Mariappan Asokan created MAPREDUCE-5034:
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             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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