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https://issues.apache.org/jira/browse/HBASE-4540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramkrishna.s.vasudevan resolved HBASE-4540.
-------------------------------------------
Resolution: Fixed
Fix Version/s: 0.90.5
Resolved both in 0.92 and 0.90.5.
> 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
> Fix For: 0.92.0, 0.90.5
>
> Attachments: HBASE-4540_1.patch, HBASE-4540_90.patch,
> HBASE-4540_90_1.patch
>
>
> -> 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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