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https://issues.apache.org/jira/browse/HBASE-10632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917721#comment-13917721
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Andrew Purtell commented on HBASE-10632:
----------------------------------------
Thanks Enis, very much appreciated
> Region lost in limbo after ArrayIndexOutOfBoundsException during assignment
> ---------------------------------------------------------------------------
>
> Key: HBASE-10632
> URL: https://issues.apache.org/jira/browse/HBASE-10632
> Project: HBase
> Issue Type: Bug
> Components: Region Assignment
> Affects Versions: hbase-10070
> Reporter: Nick Dimiduk
> Assignee: Enis Soztutar
> Fix For: 0.96.2, 0.98.1, 0.99.0, hbase-10070
>
> Attachments: hbase-10632_v1.patch
>
>
> Discovered while running IntegrationTestBigLinkedList. Region
> 24d68aa7239824e42390a77b7212fcbf is scheduled for move from hor13n19 to
> hor13n13. During the process an exception is thrown.
> {noformat}
> 2014-02-25 15:30:42,613 INFO [MASTER_SERVER_OPERATIONS-hor13n12:60000-4]
> master.RegionStates: Transitioning {24d68aa7239824e42390a77b7212fcbf
> state=OPENING, ts=1393342207107,
> server=hor13n19.gq1.ygridcore.net,60020,1393341563552} will be handled by SSH
> for hor13n19.gq1.ygridcore.net,60020,1393341563552
> 2014-02-25 15:30:42,613 INFO [MASTER_SERVER_OPERATIONS-hor13n12:60000-4]
> handler.ServerShutdownHandler: Reassigning 7 region(s) that
> hor13n19.gq1.ygridcore.net,60020,1393341563552 was carrying (and 0 regions(s)
> that were opening on this server)
> 2014-02-25 15:30:42,613 INFO [MASTER_SERVER_OPERATIONS-hor13n12:60000-4]
> handler.ServerShutdownHandler: Reassigning region with rs =
> {24d68aa7239824e42390a77b7212fcbf state=OPENING, ts=1393342207107,
> server=hor13n19.gq1.ygridcore.net,60020,1393341563552} and deleting zk node
> if exists
> 2014-02-25 15:30:42,623 INFO [MASTER_SERVER_OPERATIONS-hor13n12:60000-4]
> master.RegionStates: Transitioned {24d68aa7239824e42390a77b7212fcbf
> state=OPENING, ts=1393342207107,
> server=hor13n19.gq1.ygridcore.net,60020,1393341563552} to
> {24d68aa7239824e42390a77b7212fcbf state=OFFLINE, ts=1393342242623,
> server=hor13n19.gq1.ygridcore.net,60020,1393341563552}
> 2014-02-25 15:30:42,623 DEBUG [AM.ZK.Worker-pool2-t46]
> master.AssignmentManager: Znode
> IntegrationTestBigLinkedList,\x80\x06\x1A,1393342105093.24d68aa7239824e42390a77b7212fcbf.
> deleted, state: {24d68aa7239824e42390a77b7212fcbf state=OFFLINE,
> ts=1393342242623, server=hor13n19.gq1.ygridcore.net,60020,1393341563552}
> ...
> 2014-02-25 15:30:43,993 ERROR [MASTER_SERVER_OPERATIONS-hor13n12:60000-4]
> executor.EventHandler: Caught throwable while processing event
> M_SERVER_SHUTDOWN
> java.lang.ArrayIndexOutOfBoundsException: 0
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.<init>(BaseLoadBalancer.java:250)
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.createCluster(BaseLoadBalancer.java:921)
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.roundRobinAssignment(BaseLoadBalancer.java:860)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:2482)
> at
> org.apache.hadoop.hbase.master.handler.ServerShutdownHandler.process(ServerShutdownHandler.java:282)
> at
> org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:128)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:722)
> {noformat}
> After that, region is left in limbo and is never reassigned.
> {noformat}
> 2014-02-25 15:35:11,581 INFO [FifoRpcScheduler.handler1-thread-6]
> master.HMaster: Client=hrt_qa//68.142.246.29 move
> hri=IntegrationTestBigLinkedList,\x80\x06\x1A,1393342105093.24d68aa7239824e42390a77b7212fcbf.,
> src=hor13n19.gq1.ygridcore.net,60020,1393341563552,
> dest=hor13n13.gq1.ygridcore.net,60020,1393342222275, running balancer
> 2014-02-25 15:35:11,581 INFO [FifoRpcScheduler.handler1-thread-6]
> master.AssignmentManager: Ignored moving region not assigned: {ENCODED =>
> 24d68aa7239824e42390a77b7212fcbf, NAME =>
> 'IntegrationTestBigLinkedList,\x80\x06\x1A,1393342105093.24d68aa7239824e42390a77b7212fcbf.',
> STARTKEY => '\x80\x06\x1A', ENDKEY => ''}, {24d68aa7239824e42390a77b7212fcbf
> state=OFFLINE, ts=1393342242623,
> server=hor13n19.gq1.ygridcore.net,60020,1393341563552}
> ...
> 2014-02-25 15:35:26,586 DEBUG
> [hor13n12.gq1.ygridcore.net,60000,1393341917402-BalancerChore]
> master.HMaster: Not running balancer because 1 region(s) in transition:
> {24d68aa7239824e42390a77b7212fcbf={24d68aa7239824e42390a77b7212fcbf
> state=OFFLINE, ts=1393342242623,
> server=hor13n19.gq1.ygridcore.net,60020,1393341563552}}
> ...
> 2014-02-25 15:35:51,945 DEBUG [FifoRpcScheduler.handler1-thread-16]
> master.HMaster: Client=hrt_qa//68.142.246.29 unassign
> IntegrationTestBigLinkedList,\x80\x06\x1A,1393342105093.24d68aa7239824e42390a77b7212fcbf.
> in current location if it is online and reassign.force=false
> 2014-02-25 15:35:51,945 DEBUG [FifoRpcScheduler.handler1-thread-16]
> master.AssignmentManager: Starting unassign of
> IntegrationTestBigLinkedList,\x80\x06\x1A,1393342105093.24d68aa7239824e42390a77b7212fcbf.
> (offlining), current state: {24d68aa7239824e42390a77b7212fcbf state=OFFLINE,
> ts=1393342242623, server=hor13n19.gq1.ygridcore.net,60020,1393341563552}
> 2014-02-25 15:35:51,945 DEBUG [FifoRpcScheduler.handler1-thread-16]
> master.AssignmentManager: Attempting to unassign
> IntegrationTestBigLinkedList,\x80\x06\x1A,1393342105093.24d68aa7239824e42390a77b7212fcbf.
> but it is already in transition (OFFLINE, force=false)
> ...
> 2014-02-25 15:40:26,587 DEBUG
> [hor13n12.gq1.ygridcore.net,60000,1393341917402-BalancerChore]
> master.HMaster: Not running balancer because 1 region(s) in transition:
> {24d68aa7239824e42390a77b7212fcbf={24d68aa7239824e42390a77b7212fcbf
> state=OFFLINE, ts=1393342242623,
> server=hor13n19.gq1.ygridcore.net,60020,1393341563552}}
> {noformat}
> Spoke with [~enis] about it earlier, assigning to him.
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