[jira] [Updated] (MAPREDUCE-3769) [Gridmix] Improve the way job monitor maintains running jobs

["Amar Kamat (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amar Kamat updated MAPREDUCE-3769:
----------------------------------

    Priority: Minor  (was: Major)

We have worked around this issue by enhancing other parts of Gridmix and making the monitor multi-threaded. See MAPREDUCE-1687 and MAPREDUCE-3787 for more details. Since there is some scope of future enhancements, I will keep this ticket open but lower its priority.
                
> [Gridmix] Improve the way job monitor maintains running jobs
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-3769
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3769
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/gridmix
>    Affects Versions: 0.24.0
>            Reporter: Amar Kamat
>            Priority: Minor
>              Labels: gridmix, job-monitor
>             Fix For: 0.24.0
>
>
> Gridmix maintains a list (L) of running jobs via {{JobMonitor}}. As soon as a job is submitted, a handle for that job is cached inside the {{JobMonitor}}. The {{JobMonitor}} does the following in a thread:
> {code}
> 1. remove the first job in the list, say j
> 2. if j is complete :
>      goto #1.
>    else :
>      add j to the end of the list L. 
>      sleep for 5 seconds. 
>      goto #1.
> {code}
> Gridmix STRESS mode logic uses the list L to compute the cluster load. It iterates over map/reduce progress of each and every job in L to figure out the pending+running task count. We need to investigate and optimize the {{JobMonitor}} algorithm and make sure that the total number of completed jobs in L is minimum. The overhead of polling for the map and reduce task progress of a completed job is pretty high as it incurs an additional (RPC) step of contacting the JobHistory server.

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