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