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https://issues.apache.org/jira/browse/HBASE-4348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13246892#comment-13246892
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jirapos...@reviews.apache.org commented on HBASE-4348:
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Ship it!


I'm happy with this.  Ted do you have comments?  If no, I'll commit in about 24 
hours.


src/main/java/org/apache/hadoop/hbase/HConstants.java
<https://reviews.apache.org/r/4402/#comment14507>

    I like this name.


- jmhsieh


On 2012-04-04 21:47:04, Himanshu Vashishtha wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/4402/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2012-04-04 21:47:04)
bq.  
bq.  
bq.  Review request for hbase.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  This patch is for adding Region in transition metrics to the HMaster 
metrics system. It also adds these metrics in the master ui, in the Region in 
transition section. I have attached the proposed new format in the jira 4348.
bq.  
bq.  
bq.  This addresses bug HBase-4348.
bq.      https://issues.apache.org/jira/browse/HBase-4348
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    
src/main/jamon/org/apache/hadoop/hbase/tmpl/master/AssignmentManagerStatusTmpl.jamon
 0dc0691 
bq.    src/main/java/org/apache/hadoop/hbase/HConstants.java 21ac4ba 
bq.    src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java 
64def15 
bq.    src/main/java/org/apache/hadoop/hbase/master/HMaster.java 9bd4ace 
bq.    src/main/java/org/apache/hadoop/hbase/master/metrics/MasterMetrics.java 
83abc52 
bq.    src/test/java/org/apache/hadoop/hbase/master/TestAssignmentManager.java 
91dce36 
bq.  
bq.  Diff: https://reviews.apache.org/r/4402/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  Ran on a 5 node cluster and kill region servers randomly to observe the 
changes in the RIT metrics as emitted out by the Master's mxbean;
bq.  
bq.  mvn test passes without any failure.
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Himanshu
bq.  
bq.


                
> 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
>             Fix For: 0.96.0
>
>         Attachments: 4348-metrics-v3.patch, 4348-v1.patch, 4348-v2.patch, 
> RITs.png, RegionInTransitions2.png, metrics-v2.patch
>
>
> 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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