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Vinod Kumar Vavilapalli commented on MAPREDUCE-3901: ---------------------------------------------------- Reviewed the patch. Looks good. +1. After this, I think we can have separate caches for list of CompletedJob with tasks loaded and list of CompletedJob with no tasks loaded. Will open a separate ticket. Pushing this in. > lazy load JobHistory Task and TaskAttempt details > ------------------------------------------------- > > 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 > Attachments: MR3901.txt, MR3901_v2.txt, MR3901_v3.txt > > > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira