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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3368) Split message can come in before region opened message; results in 'Region has been PENDING_CLOSE for too long' cycle
Date Thu, 16 Dec 2010 06:39:00 GMT
Split message can come in before region opened message; results in 'Region has been PENDING_CLOSE
for too long' cycle

                 Key: HBASE-3368
                 URL: https://issues.apache.org/jira/browse/HBASE-3368
             Project: HBase
          Issue Type: Bug
            Reporter: stack
             Fix For: 0.90.0

Another good one.  Look at these excerpts from master log:

2010-12-16 00:49:45,749 INFO org.apache.hadoop.hbase.master.ServerManager: Received REGION_SPLIT:
TestTable,0078922610,1292373363753.490b382bae33642d12cd717b5785698b.: Daughters; TestTable,0078922610,1292460584999.c8b95dfc9a671083bafdaa0341279777.,
1292460584999.7cc636c9a7274eec4e784df2efebbca3. from XXX185,60020,1292460570976
2010-12-16 00:49:46,132 DEBUG org.apache.hadoop.hbase.master.handler.OpenedRegionHandler:
Opened region TestTable,0078922610,1292373363753.490b382bae33642d12cd717b5785698b. on XXX185,60020,1292460570976

... so the split will have cleared the parent from in-memory data structures and then the
open handler will add them back (though region is offlined, split).

Then the balancer runs....... only no one is holding the region thats being balanced.

Over on XXX185 I see the open and then split at these times:

2010-12-16 00:49:43,740 DEBUG org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler:
Opened TestTable,0078922610,1292373363753.490b382bae33642d12cd717b5785698b.
2010-12-16 00:49:45,003 INFO org.apache.hadoop.hbase.regionserver.SplitTransaction: Starting
split of region TestTable,0078922610,1292373363753.490b382bae33642d12cd717b5785698b.


So, the fact that it takes the Master a while to get around to the zk watcher processing messes
us up.

Root problem is that we're using two different message buses, zk and then heartbeat.  Intent
is to do all over zk and remove hearbeat but looking at what to do for 0.90.0.

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