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Posted to mapreduce-issues@hadoop.apache.org by "Mariappan Asokan (JIRA)" <ji...@apache.org> on 2013/02/27 00:38:14 UTC
[jira] [Resolved] (MAPREDUCE-5034) Class cast exception in
MergeManagerImpl.java
[ https://issues.apache.org/jira/browse/MAPREDUCE-5034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mariappan Asokan resolved MAPREDUCE-5034.
-----------------------------------------
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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