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From "Himanshu Vashishtha (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4348) Add metrics for regions in transition
Date Mon, 05 Mar 2012 06:11:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222173#comment-13222173

Himanshu Vashishtha commented on HBASE-4348:

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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