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From "Gera Shegalov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5785) Derive task attempt JVM max heap size automatically from mapreduce.*.memory.mb
Date Sat, 08 Mar 2014 12:44:42 GMT
Gera Shegalov created MAPREDUCE-5785:
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             Summary: Derive task attempt JVM max heap size automatically from mapreduce.*.memory.mb
                 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


Currently users have to set 2 memory-related configs for per Job / per task type.  One fist
choses some container size mapreduce.*.memory.mb and then a corresponding Xmx < mapreduce.*.memory.mb
to make sure that the JVM with the user code heap, and its native memory do not  exceed this
limit. If one forgets to tune Xmx, MR-AM might be allocating big containers whereas the JVM
will only use the default -Xmx200m.

With this JIRA, we propose to set Xmx automatically base on an empirical ratio that can be
adjusted. Xmx is not changed if provided by the user.




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