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https://issues.apache.org/jira/browse/HBASE-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294622#comment-13294622
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Matteo Bertozzi commented on HBASE-4391:
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Accumulo has a "tserver.memory.lock" property used to enable mlock in
TabletServer. At startup the property is read and if true mlockall() is called.
Different approach but the result is the same... the Todd proposed solution is
external from the RegionServer code (and maybe can be integrated in
hadoop-common to be used by datanode & co without changing the hdfs code), the
accumulo one is integrated in the tablet code...
> 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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