JT should not try to remove mapred.system.dir during startup
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Key: MAPREDUCE-2219
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2219
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker
Affects Versions: 0.22.0
Reporter: Todd Lipcon
During startup, the JT tries to clean up mapred.system.dir by recursively
removing it and then recreating it. This requires that mapred.system.dir is
inside a directory owned by the mapred user. For example, if set to
/system/mapred then /system must be owned by the mapred account. This isn't
documented properly and also seems unnecessary. Instead we can remove the
*contents* of mapred.system.dir instead of the directory itself.
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