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From "Gera Shegalov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5785) Derive heap size or mapreduce.*.memory.mb automatically
Date Thu, 22 Jan 2015 02:58:36 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gera Shegalov updated MAPREDUCE-5785:
-------------------------------------
    Resolution: Fixed
      Assignee: Gera Shegalov  (was: Karthik Kambatla)
        Status: Resolved  (was: Patch Available)

Committed to trunk. Thanks [~kasha] for collaborating on this patch! 

> Derive heap size or mapreduce.*.memory.mb automatically
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-5785
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5785
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: mr-am, task
>            Reporter: Gera Shegalov
>            Assignee: Gera Shegalov
>             Fix For: 3.0.0
>
>         Attachments: MAPREDUCE-5785.v01.patch, MAPREDUCE-5785.v02.patch, MAPREDUCE-5785.v03.patch,
mr-5785-4.patch, mr-5785-5.patch, mr-5785-6.patch, mr-5785-7.patch, mr-5785-8.patch, mr-5785-9.patch
>
>
> Currently users have to set 2 memory-related configs per Job / per task type.  One first
chooses some container size map reduce.\*.memory.mb and then a corresponding maximum Java
heap size Xmx < map reduce.\*.memory.mb. This makes sure that the JVM's C-heap (native
memory + Java heap) does not exceed this mapreduce.*.memory.mb. If one forgets to tune Xmx,
MR-AM might be 
> - allocating big containers whereas the JVM will only use the default -Xmx200m.
> - allocating small containers that will OOM because Xmx is too high.
> With this JIRA, we propose to set Xmx automatically based on an empirical ratio that
can be adjusted. Xmx is not changed automatically if provided by the user.



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