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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14082) Add replica id to JMX metrics names
Date Thu, 06 Aug 2015 21:34:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14660839#comment-14660839
] 

Nick Dimiduk commented on HBASE-14082:
--------------------------------------

[~enis]'s proposal should work, and I believe we've followed this pattern in other places
related to replicas (tacking on the replicaId when it's > 0). At least for OpenTSDB users,
this will [effectively result|https://github.com/OpenTSDB/tcollector/blob/master/collectors/0/hbase_regionserver.py#L29]
in new regions showing up of the form {{aaaa_replicaid_x}}. I don't think it's native tools
will allow for rollups by logical region though.

[~leochen4891]'s most recent suggestion seems also fine, but it means replica metrics will
always be aggregated by OpenTSDB (if I'm understanding this correctly).

Pros/cons of these scenarios [~eclark], [~clayb], [~tsuna], [~phobos182], [~toffer] ?

> Add replica id to JMX metrics names
> -----------------------------------
>
>                 Key: HBASE-14082
>                 URL: https://issues.apache.org/jira/browse/HBASE-14082
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics
>            Reporter: Lei Chen
>            Assignee: Lei Chen
>         Attachments: HBASE-14082-v1.patch, HBASE-14082-v2.patch
>
>
> Today, via JMX, one cannot distinguish a primary region from a replica. A possible solution
is to add replica id to JMX metrics names. The benefits may include, for example:
> # Knowing the latency of a read request on a replica region means the first attempt to
the primary region has timeout.
> # Write requests on replicas are due to the replication process, while the ones on primary
are from clients.
> # In case of looking for hot spots of read operations, replicas should be excluded since
TIMELINE reads are sent to all replicas.
> To implement, we can change the format of metrics names found at {code}Hadoop->HBase->RegionServer->Regions->Attributes{code}
> from 
> {code}namespace_<namespace>_table_<tablename>_region_<regionname>_metric_<metricname>{code}
> to
> {code}namespace_<namespace>_table_<tablename>_region_<regionname>_replicaid_<replicaid>_metric_<metricname>{code}



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