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Date: Fri, 18 Jun 2010 19:33:23 -0400 (EDT)
From: "Jean-Daniel Cryans (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Subject: [jira] Commented: (HBASE-2741) NPE in ServerManager when a region
 is closing
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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 ] 

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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