Gil Vernik created MAPREDUCE-6857:
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Summary: Reduce number of exists() calls on the target object
Key: MAPREDUCE-6857
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6857
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: distcp
Affects Versions: 3.0.0-alpha2
Reporter: Gil Vernik
Fix For: 3.0.0-alpha2
CopyMapper.map(..) calls targetStatus = targetFS.getFileStatus(target).
Few steps later RetriableFileCopyCommand.promoteTmpToTarget(..) will call again
exists(target) and delete if present.
The second exists() is useless, since if targetStatus==null it can be easily
seen if overwrite mode is activated and so target object can be deleted.
The propose of this patch is to delete target object by using targetStatus and
thus avoid calling exists() method.
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