[HBASE-20654] Expose regions in transition thru JMX

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Assignee: liubangchen
• Reporter: Ted Yu
• Created: 27/May/18 19:04
• Updated: 22/Sep/18 23:34
• Resolved: 22/Sep/18 23:34

Description

Currently only the count of regions in transition is exposed thru JMX.
Here is a sample snippet of the /jmx output:

{
  "beans" : [ {
...
  }, {
    "name" : "Hadoop:service=HBase,name=Master,sub=AssignmentManager",
    "modelerType" : "Master,sub=AssignmentManager",
    "tag.Context" : "master",
...
    "ritCount" : 3

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.