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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1018) Regionservers should report detailed health to master; master should flag troubled regionservers in UI
Date Mon, 24 Nov 2008 19:25:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650288#action_12650288
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Andrew Purtell commented on HBASE-1018:
---------------------------------------

I tried using Runtime. Seemed no good way to get a good read on 'used'. The MBean gets it
right and the JRE >= 5.0 includes everything needed. Runtime.getRuntime().maxMemory behaved
as you'd expect. Runtime.getRuntime().freeMemory would start off in the single digits and
climb. Runtime.getRuntime().totalMemory didn't look right either. 


> Regionservers should report detailed health to master; master should flag troubled regionservers
in UI
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-1018
>                 URL: https://issues.apache.org/jira/browse/HBASE-1018
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: master, regionserver
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>             Fix For: 0.19.0
>
>         Attachments: 1018.patch
>
>
> Regionservers should report detailed health to master. The master should flag troubled
regionservers in the UI.
> The concern at the moment is primarily heap. Regionservers should report used, committed,
and max heap metrics in the periodic report. The master should flag in the regionserver list
on /master.jsp those regionservers where available heap is below a configurable threshold.


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