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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12569) Control MaxDirectMemorySize in the same manner as heap size
Date Thu, 29 Jan 2015 07:05:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14296488#comment-14296488

ramkrishna.s.vasudevan commented on HBASE-12569:

I just hit this issue in an older version.  In the older versions the HBASE_OFFHEAPSIZE was
never getting used at all. 
So just in case some one is trying to set MaxDirectMemory for offheap bucketCache that does
not have this JIRA's fix
thinking that setting HBASE_OFFHEAPSIZE would help to control the maxDirectMemory size based
on the reference here
http://hbase.apache.org/book.html#perf.reading.  Ensure that you set SET_THIS_TO_HOW_MANY_GIGS_OF_OFFHEAP
or directly use export HBASE_OPTS="$HBASE_OPTS -XX:MaxDirectMemorySize=8G option. 
Just adding for reference.

> Control MaxDirectMemorySize in the same manner as heap size
> -----------------------------------------------------------
>                 Key: HBASE-12569
>                 URL: https://issues.apache.org/jira/browse/HBASE-12569
>             Project: HBase
>          Issue Type: Improvement
>          Components: scripts
>    Affects Versions: 0.98.7
>         Environment: CentOS 6
>            Reporter: Patrick White
>            Assignee: Patrick White
>            Priority: Minor
>             Fix For: 2.0.0, 0.99.2
>         Attachments: 0001-HBASE-12569-Update-scripts-to-control-MaxDirectMemor.patch,
> It would make it much easier on us if we could manage MaxDirectMemorySize in the same
way as heap. This patch allows that to happen.
> Note: I have not tested the *.cmd modifications as I don't have a Windows box (at the
moment, can test at home) but look like they should work (famous last words).

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