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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4391) Add ability to start RS as root and call mlockall
Date Thu, 14 Jun 2012 20:05:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295276#comment-13295276
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stack commented on HBASE-4391:
------------------------------

@Matteo What about Andrew's suggested location for the src and native bits?  Whats it like
when we add compile of mlockall to our compile goal in mvn?  Is it fast?  On this question:

bq. If this will be integrated in hbase, do you want to force everyone to use root or add
hbase user in limits.d to start RS? or we can add some --no-swap flag to region server start
script?

We cannot require you be root to start hbase.  It looks like this not necessary anyways? 
If you want the mlockall facility, then you can require folks be root (or do you security.conf
trick).

The Todd trick is nice as is your tidy up.  Thanks.
                
> 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: Todd Lipcon
>             Fix For: 0.96.0
>
>         Attachments: HBASE-4391-v0.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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