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From "Zhihong Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4391) Add ability to start RS as root and call mlockall
Date Sun, 24 Jun 2012 16:18:43 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhihong Ted Yu updated HBASE-4391:
----------------------------------

    Attachment: 4391-v4.patch

Patch v4 corrects some grammatical errors.
                
> 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: Matteo Bertozzi
>             Fix For: 0.96.0
>
>         Attachments: 4391-v4.patch, HBASE-4391-v0.patch, HBASE-4391-v1.patch, HBASE-4391-v2.patch,
HBASE-4391-v3.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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