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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