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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4391) Add ability to start RS as root and call mlockall
Date Sun, 24 Jun 2012 15:34:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13400167#comment-13400167
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Matteo Bertozzi commented on HBASE-4391:
----------------------------------------

Yeah .dylib is the equivalent to .so
but I've hardcoded .so in the bin/ and assembly script 
any idea to pick the right one?

(Do we need to support this on mac? you can always load by it hand as explained by todd)
                
> Add ability to start RS as root and call mlockall
> -------------------------------------------------
>
>                 Key: HBASE-4391
>                 URL: https://issues.apache.org/jira/browse/HBASE-4391
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver
>    Affects Versions: 0.94.0
>            Reporter: Todd Lipcon
>            Assignee: Matteo Bertozzi
>             Fix For: 0.96.0
>
>         Attachments: HBASE-4391-v0.patch, HBASE-4391-v1.patch, HBASE-4391-v2.patch, HBASE-4391-v3.patch
>
>
> A common issue we've seen in practice is that users oversubscribe their region servers
with too many MR tasks, etc. As soon as the machine starts swapping, the RS grinds to a halt,
loses ZK session, aborts, etc.
> This can be combatted by starting the RS as root, calling mlockall(), and then setuid
down to the hbase user. We should not require this, but we should provide it as an option.

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