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https://issues.apache.org/jira/browse/HBASE-4348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222173#comment-13222173
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Himanshu Vashishtha commented on HBASE-4348:
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I have some some analysis and some questions regarding the metrics here. Please
correct me if I am wrong.
RegionServer updates its metrics at fix intervals defined by
"hbase.regionserver.msginterval" and the metrics are pushed to the record after
specified interval.
Master don't use this methodology; rather whenever the master statistics are
changed, the caller is supposed to update the metrics value on its own.
I am wondering why we don't follow the same approach for master (because the
stats we are recording are not changing that often?). The reason I am asking is
because the regionsInTransition map is mutated at bunch of places in the
AssignmentManager class; so either I should invoke the method to compute and
push the stats at all such callstacks, or may be we can have a similar approach
as used by RegionServer.
> Add metrics for regions in transition
> -------------------------------------
>
> Key: HBASE-4348
> URL: https://issues.apache.org/jira/browse/HBASE-4348
> Project: HBase
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Assignee: Himanshu Vashishtha
> Priority: Minor
> Labels: noob
> Attachments: 4348-v1.patch, 4348-v2.patch, RITs.png
>
>
> The following metrics would be useful for monitoring the master:
> - the number of regions in transition
> - the number of regions in transition that have been in transition for more
> than a minute
> - how many seconds has the oldest region-in-transition been in transition
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