JT should ensure history directory is a directory
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Key: MAPREDUCE-2427
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2427
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker
Affects Versions: 0.20.2
Reporter: E. Sammer
If the JT history directory doesn't exist or isn't a directory retired job
files are renamed to a file called 'history' and eventually start overwriting
each other. The JT should ensure 'history' exists and is a directory before
performing the move.
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