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https://issues.apache.org/jira/browse/HBASE-2741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880367#action_12880367
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Jean-Daniel Cryans commented on HBASE-2741:
-------------------------------------------
Also HBaseEventHandler has static members like serverManager, and since it's
not static it means that when the second master boots up it replaces the
instance with his own.
> NPE in ServerManager when a region is closing
> ---------------------------------------------
>
> Key: HBASE-2741
> URL: https://issues.apache.org/jira/browse/HBASE-2741
> Project: HBase
> Issue Type: Bug
> Reporter: Jean-Daniel Cryans
> Assignee: Karthik Ranganathan
> Fix For: 0.21.0
>
>
> While running TestReplication I bumped into:
> {code}
> 2010-06-16 16:44:07,576 DEBUG [IPC Server handler 3 on 62423]
> master.RegionManager(357): Created UNASSIGNED zNode
> test,,1276731846828.de5dcd3df0fbc58207ce6ccff9ff2870. in state
> M2ZK_REGION_OFFLINE
> 2010-06-16 16:44:07,577 INFO [RegionServer:0]
> regionserver.HRegionServer(511): MSG_REGION_OPEN:
> test,,1276731846828.de5dcd3df0fbc58207ce6ccff9ff2870.
> 2010-06-16 16:44:07,577 INFO [RegionServer:0.worker]
> regionserver.HRegionServer$Worker(1358): Worker: MSG_REGION_OPEN:
> test,,1276731846828.de5dcd3df0fbc58207ce6ccff9ff2870.
> 2010-06-16 16:44:07,578 DEBUG [RegionServer:0.worker]
> regionserver.RSZookeeperUpdater(157): Updating ZNode
> /1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870 with [RS2ZK_REGION_OPENING]
> expected version = 0
> 2010-06-16 16:44:07,580 DEBUG [main-EventThread] master.HMaster(1142): Event
> NodeDataChanged with state SyncConnected with path
> /1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,580 DEBUG [main-EventThread]
> master.ZKMasterAddressWatcher(64): Got event NodeDataChanged with path
> /1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,580 DEBUG [main-EventThread]
> master.ZKUnassignedWatcher(71): ZK-EVENT-PROCESS: Got zkEvent NodeDataChanged
> state:SyncConnected path:/1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,580 INFO [main-EventThread]
> regionserver.HRegionServer(379): Got ZooKeeper event, state: SyncConnected,
> type: NodeDataChanged, path: /1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,581 DEBUG [RegionServer:0.worker]
> regionserver.HRegion(294): Creating region
> test,,1276731846828.de5dcd3df0fbc58207ce6ccff9ff2870.
> 2010-06-16 16:44:07,582 DEBUG [MASTER_CLOSEREGION-master-1]
> handler.MasterOpenRegionHandler(70): Event = RS2ZK_REGION_OPENING, region =
> de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,582 DEBUG [MASTER_CLOSEREGION-master-1]
> handler.MasterOpenRegionHandler(81): NO-OP call to handling region opening
> event
> 2010-06-16 16:44:07,589 INFO [RegionServer:0.worker]
> regionserver.HRegion(369): region
> test,,1276731846828.de5dcd3df0fbc58207ce6ccff9ff2870. available; sequence id
> is 1
> 2010-06-16 16:44:07,590 DEBUG [RegionServer:0.worker]
> regionserver.RSZookeeperUpdater(157): Updating ZNode
> /1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870 with [RS2ZK_REGION_OPENED]
> expected version = 1
> 2010-06-16 16:44:07,591 DEBUG [main-EventThread] master.HMaster(1142): Event
> NodeDataChanged with state SyncConnected with path
> /1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,591 DEBUG [main-EventThread]
> master.ZKMasterAddressWatcher(64): Got event NodeDataChanged with path
> /1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,592 DEBUG [main-EventThread]
> master.ZKUnassignedWatcher(71): ZK-EVENT-PROCESS: Got zkEvent NodeDataChanged
> state:SyncConnected path:/1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,591 INFO [main-EventThread]
> regionserver.HRegionServer(379): Got ZooKeeper event, state: SyncConnected,
> type: NodeDataChanged, path: /1/UNASSIGNED/de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,593 DEBUG [MASTER_CLOSEREGION-master-1]
> handler.MasterOpenRegionHandler(70): Event = RS2ZK_REGION_OPENED, region =
> de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,594 DEBUG [MASTER_CLOSEREGION-master-1]
> handler.MasterOpenRegionHandler(96): RS 10.10.1.130,62425,1276731832950 has
> opened region de5dcd3df0fbc58207ce6ccff9ff2870
> 2010-06-16 16:44:07,594 ERROR [MASTER_CLOSEREGION-master-1]
> server.NIOServerCnxn$Factory$1(81): Thread
> Thread[MASTER_CLOSEREGION-master-1,5,main] died
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.master.ServerManager.processRegionOpen(ServerManager.java:607)
> at
> org.apache.hadoop.hbase.master.handler.MasterOpenRegionHandler.handleRegionOpenedEvent(MasterOpenRegionHandler.java:99)
> at
> org.apache.hadoop.hbase.master.handler.MasterOpenRegionHandler.process(MasterOpenRegionHandler.java:75)
> at
> org.apache.hadoop.hbase.executor.HBaseEventHandler.run(HBaseEventHandler.java:215)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:637)
> {code}
> This looks very new. Assigning Karthik as he was there recently.
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