TaskTracker can skip a dfs check on every task launch.
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Key: HADOOP-3712
URL: https://issues.apache.org/jira/browse/HADOOP-3712
Project: Hadoop Core
Issue Type: Improvement
Components: mapred
Reporter: Amar Kamat
When tasktracker gets a new task to run, it queries the namenode to find out
the job directory _size_. This _size_ is required if the job files are not yet
localized. But if its already localized then the dfs call gets wasted. This
will be true for all but 1 tasks that run for a job on a tracker. One can avoid
it but checking if the job is already localized.
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