Anoop Sam John commented on HBASE-16417:

Are you seeing that a long pause GC happened and so RS got killed by master 
You said RS got OOME..  That is strange.
Because consider 32 GB heap and 50 regions and each region having 128 MB flush 
size.   By default we have 4 as the blocking memstore size.  Means this 128MB 
can become 512 MB. After that the memstore wont receive writes.
50* 128 * 4 =  25 GB.   
So am not getting how u got OOME.   U might get long GC pause.

> In-Memory MemStore Policy for Flattening and Compactions
> --------------------------------------------------------
>                 Key: HBASE-16417
>                 URL: https://issues.apache.org/jira/browse/HBASE-16417
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>            Assignee: Anastasia Braginsky
>             Fix For: 2.0.0

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