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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
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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
{code}
# export HBASE_OPTS="$HBASE_OPTS -XX:MaxDirectMemorySize=SET_THIS_TO_HOW_MANY_GIGS_OF_OFFHEAP"
{code}
thinking that setting HBASE_OFFHEAPSIZE would help to control the maxDirectMemory size based
on the reference here
http://hbase.apache.org/book.html#perf.reading.  Ensure that you set SET_THIS_TO_HOW_MANY_GIGS_OF_OFFHEAP
or directly use export HBASE_OPTS="$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,
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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