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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HADOOP-5964) Fix the 'cluster drain' problem in the Capacity Scheduler wrt High RAM Jobs
Date Fri, 05 Jun 2009 07:08:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy reassigned HADOOP-5964:
-------------------------------------

    Assignee: Arun C Murthy

> Fix the 'cluster drain' problem in the Capacity Scheduler wrt High RAM Jobs
> ---------------------------------------------------------------------------
>
>                 Key: HADOOP-5964
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5964
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/capacity-sched
>    Affects Versions: 0.20.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-5964_0_20090602.patch
>
>
> When a HighRAMJob turns up at the head of the queue, the current implementation of support
for HighRAMJobs in the Capacity Scheduler has problem in that the scheduler stops assigning
tasks to all TaskTrackers in the cluster until a HighRAMJob finds a suitable TaskTrackers
for all its tasks.
> This causes a severe utilization problem since effectively no new tasks are allowed to
run until the HighRAMJob (at the head of the queue) gets slots.

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