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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5802) Change the default metrics class to NullContextWithUpdateThread
Date Tue, 17 Apr 2012 04:17:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255295#comment-13255295
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stack commented on HBASE-5802:
------------------------------

So, enable jmx emissions?  Would suggest that your patch include comment explaining what the
exotic-sounding NullContextWithUpdateThread does.  Maybe copy the class comment into your
patch somewhere:

{code}
 * A null context which has a thread calling
 * periodically when monitoring is started. This keeps the data sampled
 * correctly.
 * In all other respects, this is like the NULL context: No data is emitted.
 * This is suitable for Monitoring systems like JMX which reads the metrics
 *  when someone reads the data from JMX.
 *
 * The default impl of start and stop monitoring:
 *  is the AbstractMetricsContext is good enough.
{code}

Maybe update the reference guide too especially if you are changing default.

Good stuff E.
                
> Change the default metrics class to NullContextWithUpdateThread
> ---------------------------------------------------------------
>
>                 Key: HBASE-5802
>                 URL: https://issues.apache.org/jira/browse/HBASE-5802
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>            Priority: Minor
>         Attachments: HBASE-5802-0.patch
>
>
> Since lots more metrics are being placed into the Dynamic metrics bucket changing the
default class to NullContextWithUpdateThread seems like it might be worth it.

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