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https://issues.apache.org/jira/browse/HBASE-20654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16495488#comment-16495488
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Sean Busbey commented on HBASE-20654:
-------------------------------------

you can also get this in the Java API from the ClusterMetrics object returned 
from Admin, I think.

In the shell it'd look like:

{code}
hbase(main):038:0> regions_in_transition = @hbase.admin.instance_eval do
hbase(main):039:1*   @admin.get_cluster_metrics.get_region_states_in_transition
hbase(main):040:1> end
=> #<Java::JavaUtil::Collections::UnmodifiableRandomAccessList:0x51508029>
{code}

> Expose regions in transition thru JMX
> -------------------------------------
>
>                 Key: HBASE-20654
>                 URL: https://issues.apache.org/jira/browse/HBASE-20654
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: liubangchen
>            Priority: Major
>         Attachments: HBASE-20654-1.patch, HBASE-20654-2.patch
>
>
> Currently only the count of regions in transition is exposed thru JMX.
> Here is a sample snippet of the /jmx output:
> {code}
> {
>   "beans" : [ {
> ...
>   }, {
>     "name" : "Hadoop:service=HBase,name=Master,sub=AssignmentManager",
>     "modelerType" : "Master,sub=AssignmentManager",
>     "tag.Context" : "master",
> ...
>     "ritCount" : 3
> {code}
> It would be desirable to expose region name, state for the regions in 
> transition as well.
> We can place configurable upper bound on the number of entries returned in 
> case there're a lot of regions in transition.



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