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From "ramkrishna.s.vasudevan (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4540) OpenedRegionHandler is not enforcing atomicity of the operation it is performing
Date Wed, 05 Oct 2011 09:37:34 GMT
OpenedRegionHandler is not enforcing atomicity of the operation it is performing
--------------------------------------------------------------------------------

                 Key: HBASE-4540
                 URL: https://issues.apache.org/jira/browse/HBASE-4540
             Project: HBase
          Issue Type: Bug
            Reporter: ramkrishna.s.vasudevan
            Assignee: ramkrishna.s.vasudevan


-> OpenedRegionHandler has not yet deleted the znode of the region R1 opened by RS1.
-> RS1 goes down.
-> Servershutdownhandler assigns the region R1 to RS2.
-> The znode of R1 is moved to OFFLINE state by master or OPENING state by RS2 if RS2 has
started opening the region.
-> Now the first OpenedRegionHandler tries to delete the znode thinking its in OPENED state
but fails.
-> Though it fails it removes the node from RIT and adds RS1 as the owner of R1 in master's
memory.
-> Now when RS2 completes opening the region the master is not able to open the region
as already the reigon has been deleted from RIT.
{code}
Master
======
2011-10-05 20:49:45,301 INFO org.apache.hadoop.hbase.master.handler.ServerShutdownHandler:
Finished processing of shutdown of linux146,60020,1317827727647
2011-10-05 20:49:54,177 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer
because 1 region(s) in transition: {3e69d628a8bd8e9b7c5e7a2a6e03aad9=t1,,1317827883842.3e69d628a8bd8e9b7c5e7a2a6e03aad9.
state=PENDING_OPEN, ts=1317827985272, server=linux76,60020,1317827746847}
2011-10-05 20:49:57,720 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=M_ZK_REGION_OFFLINE,
server=linux76,60000,1317827742012, region=3e69d628a8bd8e9b7c5e7a2a6e03aad9
2011-10-05 20:50:14,501 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: master:60000-0x132d3dc13090023
Deleting existing unassigned node for 3e69d628a8bd8e9b7c5e7a2a6e03aad9 that is in expected
state RS_ZK_REGION_OPENED
2011-10-05 20:50:14,505 WARN org.apache.hadoop.hbase.zookeeper.ZKAssign: master:60000-0x132d3dc13090023
Attempting to delete unassigned node 3e69d628a8bd8e9b7c5e7a2a6e03aad9 in RS_ZK_REGION_OPENED
state but node is in RS_ZK_REGION_OPENING state

After the region is opened in RS2
=================================
2011-10-05 20:50:48,066 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=RS_ZK_REGION_OPENING,
server=linux76,60020,1317827746847, region=3e69d628a8bd8e9b7c5e7a2a6e03aad9, which is more
than 15 seconds late
2011-10-05 20:50:48,290 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received OPENING
for region 3e69d628a8bd8e9b7c5e7a2a6e03aad9 from server linux76,60020,1317827746847 but region
was in  the state null and not in expected PENDING_OPEN or OPENING states
2011-10-05 20:50:53,743 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=RS_ZK_REGION_OPENING,
server=linux76,60020,1317827746847, region=3e69d628a8bd8e9b7c5e7a2a6e03aad9
2011-10-05 20:50:54,182 DEBUG org.apache.hadoop.hbase.master.CatalogJanitor: Scanned 1 catalog
row(s) and gc'd 0 unreferenced parent region(s)
2011-10-05 20:50:54,397 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received OPENING
for region 3e69d628a8bd8e9b7c5e7a2a6e03aad9 from server linux76,60020,1317827746847 but region
was in  the state null and not in expected PENDING_OPEN or OPENING states
{code}


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