"map.input.path" is null at the first split when use CombieFileInputFormat
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Key: MAPREDUCE-3517
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3517
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: task
Affects Versions: 0.20.203.0
Reporter: wanbin
"map.input.path" is null at the first split when use CombieFileInputFormat.
because in runNewMapper function, mapContext instead of taskContext which is
set "map.input.path". so we need set "map.input.path" again to mapContext
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