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From "Vivek Ratan (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 Mon, 10 Nov 2008 14:51:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646273#action_12646273
] 

Vivek Ratan commented on HADOOP-4558:
-------------------------------------

We should leave this as is. The right solution depends on how we handle HADOOP-4421. If the
schedulers are aware of setup tasks and handle them directly, then the solution is different
from if setup tasks are handled outside of the Scheduler. 

> 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
>         Attachments: 4558.1.patch
>
>
> 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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