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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