[jira] [Commented] (HBASE-4391) Add ability to start RS as root and call mlockall

["Matteo Bertozzi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13290307#comment-13290307 ] 

Matteo Bertozzi commented on HBASE-4391:
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todd's code looks good to me.

One way to avoid using root to start the RS is adding hbase user to /etc/security/limits.d/
{code}echo "$USER - memlock $MAX_MEMLOCK_SIZE" >/etc/security/limits.d/$USER.conf{code}

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?
                
> 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
>
>
> 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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