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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11206) Enable automagically tweaking memstore and blockcache sizes
Date Tue, 25 Jul 2017 17:54:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16100442#comment-16100442
] 

Anoop Sam John commented on HBASE-11206:
----------------------------------------

We can.  As Nick pointed above, it works with on heap things only. This is   HeapMemory tuner.
 So the Memstore (MSLAB) and BC both in on heap.  Now we have off heap support for both these
in 2.0.  But there is  not auto tuner for off heap.  But any way another story and  can be
done later.  This can be helpful for those who use both on heap.

> Enable automagically tweaking memstore and blockcache sizes
> -----------------------------------------------------------
>
>                 Key: HBASE-11206
>                 URL: https://issues.apache.org/jira/browse/HBASE-11206
>             Project: HBase
>          Issue Type: Task
>            Reporter: stack
>            Assignee: stack
>
> HBASE-5349
> "Automagically tweak global memstore and block cache sizes based on workload" adds a
nice new feature. It is off by default.  Lets turn it on for 0.99.  Liang Xie is concerned
that automatically shifting blockcache and memstore sizes could wreck havoc w/ GC'ing in low-latency
serving situation -- a valid concern -- but lets enable this feature in 0.99 and see how it
does.  Can always disable it before 1.0 if a problem.



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