TaskTracker does not need to fully unjar job jars
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Key: MAPREDUCE-967
URL: https://issues.apache.org/jira/browse/MAPREDUCE-967
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: tasktracker
Affects Versions: 0.21.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
In practice we have seen some users submitting job jars that consist of 10,000+
classes. Unpacking these jars into mapred.local.dir and then cleaning up after
them has a significant cost (both in wall clock and in unnecessary heavy disk
utilization). This cost can be easily avoided
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