JobTracker should not try to promote a (map) task if it dis not write to DFS at
all
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Key: HADOOP-3140
URL: https://issues.apache.org/jira/browse/HADOOP-3140
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Runping Qi
In most cases, map tasks do not write to dfs.
Thus, when they complete, they should not be put into commit_pending queue at
all.
This will improve the task promotion significantly.
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