[jira] [Commented] (HBASE-16401) Enable HeapMemoryManager by default in 2.0

["Anoop Sam John (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-16401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15644898#comment-15644898 ] 

Anoop Sam John commented on HBASE-16401:
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I think we need to keep it lower. 2.0 we recommend G1GC ?  It would be better not to keep permanent reserved heap at a so high rate.
Block cache we allow to be 0% even and till 40% as def.  On side note, after the off heaping work, we can suggest off heap L2 cache as default for the data cache now. We can keep L1 cache for index data.  This should be very less size requirement.
Even memstore also 20 - 40% is good enough? Or may be 20 - 50%?  Just saying.

> Enable HeapMemoryManager by default in 2.0
> ------------------------------------------
>
>                 Key: HBASE-16401
>                 URL: https://issues.apache.org/jira/browse/HBASE-16401
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Priority: Critical
>             Fix For: 2.0.0
>
>
> Back in HBASE-5349, on the end of the issue, we talked about enabling HeapMemoryManager by default. Lets do it for 2.0 with some conservative boundaries. Do it now so we have some experience running it before release.



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