MR2 memory limits should be pmem, not vmem
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Key: MAPREDUCE-3205
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3205
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: mrv2, nodemanager
Affects Versions: 0.23.0
Reporter: Todd Lipcon
Currently, the memory resources requested for a container limit the amount of
virtual memory used by the container. On my test clusters, at least, Java
processes take up nearly twice as much vmem as pmem - a Java process running
with -Xmx500m uses 935m of vmem and only about 560m of pmem.
This will force admins to either under-utilize available physical memory, or
oversubscribe it by configuring the available resources on a TT to be larger
than the true amount of physical RAM.
Instead, I would propose that the resource limit apply to pmem, and allow the
admin to configure a "vmem overcommit ratio" which sets the vmem limit as a
function of pmem limit.
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