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From "Zhihong Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6567) make memory locking configuration of regioservers more flexible
Date Mon, 13 Aug 2012 17:51:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433359#comment-13433359
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Zhihong Ted Yu commented on HBASE-6567:
---------------------------------------

Looks like two variable approach would minimize misunderstanding of this feature.
                
> make memory locking configuration of regioservers more flexible
> ---------------------------------------------------------------
>
>                 Key: HBASE-6567
>                 URL: https://issues.apache.org/jira/browse/HBASE-6567
>             Project: HBase
>          Issue Type: Improvement
>          Components: scripts
>    Affects Versions: 0.96.0
>            Reporter: Roman Shaposhnik
>            Assignee: Roman Shaposhnik
>             Fix For: 0.96.0
>
>
> The current implementation of the memory locking feature of regisoservers has a downside
of not being flexible to configure for permanent use. Sure there is a --mlock flag but that
needs to be explicitly passed on every invocation and thus require extra steps to be configured
for permanent use (IOW, there's not a single env variable I can set to have a desired effect).
The only other alternative -- the explicit setting of HBASE_REGIONSERVER_OPTS -- has a downside
of being pretty cryptic to the novice user and has a killer problem of not explicitly telling
higher level scripts (like init.d or upstart ones) which user the initial hbase process should
be executed as.
> I propose a very simple solution (which is essentially making --mlock setting into an
env. variable): add a variable called HBASE_REGIONSERVER_MLOCK that can be set in hbase-env.sh
and has the following semantics:
>    * [default] not set: mlocking feature is disabled
>    * set but empty: mlocking feature is enabled and the target user is hbase
>    * set and not empty: mlocking feature is enabled and the target user is the value
of the variable
> Thoughts?

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