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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5425) JVM reuse across task types
Date Mon, 04 May 2009 05:52:30 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Devaraj Das updated HADOOP-5425:
--------------------------------

    Status: Open  (was: Patch Available)

Vinod pointed out that we cannot reuse the same jvm across multiple task types at least for
the reason that one might want to specify different heap sizes for the map and reduce jvms.


> JVM reuse across task types
> ---------------------------
>
>                 Key: HADOOP-5425
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5425
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.19.0
>            Reporter: Vinod K V
>            Assignee: Devaraj Das
>             Fix For: 0.21.0
>
>         Attachments: 5425.1.patch
>
>
> Currently, JVM-reuse is across tasks of same type of the same job, i.e. JVMs are kind
of marked as map-JVMs and reduce JVMs. May be we can reuse JVMs across tasks of different
types but of the same job.

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