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From "Karam Singh (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4558) Scheduler fails to reclaim capacity if Jobs are submitted to queue one after the other
Date Fri, 31 Oct 2008 14:43:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644308#action_12644308
] 

Karam Singh commented on HADOOP-4558:
-------------------------------------

Submitted sleep Job J1 to Q1 with maps and reduces tasks = 210 each.
Sleep time per map =10 mins and reduces = 20 mins.
When all maps and reduces of J1 starts running, submitted sleep Job J2 to Q2 with maps and
reduces tasks = 210 each. 

J2  started only after 10 mins when maps of J1 starts finishing up. 
J2 should get its slots after 2 mins (i.e after its reclaim time limit).



> Scheduler fails to reclaim capacity if Jobs are submitted to queue one after the other
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4558
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4558
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/capacity-sched
>    Affects Versions: 0.19.0
>         Environment: Cluster Capacity Maps=Reduces =210 each
> Two Queues: 
> Q1:  default, GC (%) =40, GC=84 (Maps and Reduces each). Reclaim time = 3 mins.
> Q2: test_q1, GC (%) =60, GC=126 (Maps and Reduces each) Reclaim time = 2 mins
>            Reporter: Karam Singh
>
> Scheduler fails to reclaim capacity if Jobs are submitted to queue one after the other.
> First job submitted with tasks equal to cluster's M/R Capacity
> Second is submitted to different queue when all tasks of First Job are running, scheduler
fails to reclaim capacity for second job.

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