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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3039) Stuck in regionsInTransition because rebalance came in at same time as a split
Date Sat, 25 Sep 2010 21:46:33 GMT
Stuck in regionsInTransition because rebalance came in at same time as a split
------------------------------------------------------------------------------

                 Key: HBASE-3039
                 URL: https://issues.apache.org/jira/browse/HBASE-3039
             Project: HBase
          Issue Type: Bug
          Components: master
            Reporter: stack
             Fix For: 0.90.0


Saw this doing cluster tests:

{code}
2010-09-25 21:31:48,212 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer
because regions in transition: {73781e505e452221c9cd0e03585eb5d1=usertable,user800184056,

128...
{code}

Here's the problem:

{code}
2010-09-25 08:16:48,186 INFO org.apache.hadoop.hbase.master.HMaster: balance hri=usertable,user800184056,1285397376525.73781e505e452221c9cd0e03585eb5d1.,
src=su184,60020,      
1285371621579, dest=sv2borg189,60020,1285371621577

2010-09-25 08:16:48,186 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Starting unassignment
of region usertable,user800184056,1285397376525.                               
73781e505e452221c9cd0e03585eb5d1. (offlining)

2010-09-25 08:16:52,656 INFO org.apache.hadoop.hbase.master.ServerManager: Received REGION_SPLIT:
usertable,user800184056,1285397376525.73781e505e452221c9cd0e03585eb5d1.:           
Daughters; usertable,user800184056,1285402609029.c05825561e7ea3cc6507c70bfb21541a., usertable,user804024623,1285402609029.28f64903a7875bdafc1e7ee344b225b0.
2010-09-25 08:17:11,414 INFO org.apache.hadoop.hbase.master.AssignmentManager: Regions in
transition timed out:  usertable,user800184056,1285397376525.                            
 
73781e505e452221c9cd0e03585eb5d1. state=PENDING_CLOSE, ts=1285402608186
{code}


....just as we were doing a balance, the region split.

Over on RS, I see the split starting up and then in comes the balance 'close' message.  By
the time the close handler runs on regionserver the split is well underway and close handler
actually doesn't find an online region to split.

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