[jira] [Created] (HBASE-21283) Add new shell command 'rit' for listing regions in transition

["Andrew Purtell (JIRA)" <ji...@apache.org>]

Andrew Purtell created HBASE-21283:
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             Summary: Add new shell command 'rit' for listing regions in transition
                 Key: HBASE-21283
                 URL: https://issues.apache.org/jira/browse/HBASE-21283
             Project: HBase
          Issue Type: Improvement
            Reporter: Andrew Purtell
            Assignee: Andrew Purtell
             Fix For: 3.0.0, 1.5.0, 2.2.0


The 'status' shell command shows regions in transition but sometimes an operator may want to retrieve a simple list of regions in transition. Here's a patch that adds a new 'rit' command to the TOOLS group that does just that. 

No test, because it seems hard to mock RITs from the ruby test code, but I have run TestShell and it passes, so the command is verified to meet minimum requirements, like help text, and manually verified with branch-1 (shell in branch-2 and up doesn't return until TransitRegionProcedure has completed so by that time no RIT):

{noformat}
HBase Shell
Use "help" to get list of supported commands.
Use "exit" to quit this interactive shell.
Version 1.5.0-SNAPSHOT, r9bb6d2fa8b760f16cd046657240ebd4ad91cb6de, Mon Oct  8 21:05:50 UTC 2018

hbase(main):001:0> help 'rit'
List all regions in transition.
Examples:
  hbase> rit

hbase(main):002:0> create ...
0 row(s) in 2.5150 seconds
=> Hbase::Table - IntegrationTestBigLinkedList

hbase(main):003:0> rit
0 row(s) in 0.0340 seconds

hbase(main):004:0> unassign '56f0c38c81ae453d19906ce156a2d6a1'
0 row(s) in 0.0540 seconds

hbase(main):005:0> rit 
IntegrationTestBigLinkedList,L\xCC\xCC\xCC\xCC\xCC\xCC\xCB,1539117183224.56f0c38c81ae453d19906ce156a2d6a1. state=PENDING_CLOSE, ts=Tue Oct 09 20:33:34 UTC 2018 (0s ago), server=null                                                                                                                                                                                   
1 row(s) in 0.0170 seconds
{noformat}




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