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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4391) Add ability to start RS as root and call mlockall
Date Mon, 11 Jun 2012 18:50:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292975#comment-13292975
] 

Enis Soztutar commented on HBASE-4391:
--------------------------------------

I've seen smt similar in accumulo code base: 
http://svn.apache.org/viewvc/accumulo/trunk/server/src/main/c%2B%2B/mlock/
http://svn.apache.org/viewvc/accumulo/trunk/server/src/main/java/org/apache/accumulo/server/tabletserver/MLock.java?view=log
                
> 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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