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stack commented on HBASE-4540: ------------------------------ Can we resolve this issue now Ram? > 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 > > 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} -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira