optimize JobInProgress.getTaskInProgress(taskid)
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Key: MAPREDUCE-2339
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2339
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: jobtracker
Affects Versions: 0.21.0, 0.20.2
Reporter: Kang Xiao
JobInProgress.getTaskInProgress(taskid) use a linner search to get the
TaskInProgress object by taskid. In fact, it can be replaced by much more
efficient array index operation.
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