Enhance JobClient API implementations to look at history files to get
information about jobs that are not in memory
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Key: MAPREDUCE-864
URL: https://issues.apache.org/jira/browse/MAPREDUCE-864
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Components: jobtracker
Reporter: Devaraj Das
Fix For: 0.21.0
MAPREDUCE-817 added an API to get the JobHistory URL from the JobTracker. This
is useful in two ways:
1) Users can use this API to get the URL, copy the history files to their local
disk, and, do processing on them
2) APIs like JobSubmissionProtocol.getJobCounters, can read a part of the
history file, and then return the information to the caller (if the job is not
there in JT memory). This would mimic most of the CompletedJobsStatusStore
functionality.
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