lazy load JobHistory Task and TaskAttempt details
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Key: MAPREDUCE-3901
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3901
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: jobhistoryserver, mrv2
Affects Versions: 0.23.0
Reporter: Siddharth Seth
Assignee: Siddharth Seth
The job history UI and MRClientProtocol calls routed via JobHistory are very
slow for large jobs. Some of this time is spent parsing the history file. A
good chunk is spent pre-creating lots of objects which may never be used. Those
can be create when required - bringing down the load times of job history pages
and getJobReport etc calls to approximately the history file parse time.
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