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https://issues.apache.org/jira/browse/HBASE-4473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean-Daniel Cryans updated HBASE-4473:
--------------------------------------
Attachment: HBASE-4473-v2.patch
Attaching the patch I committed with Stack's comment.
> NPE when executors are down but events are still coming in
> ----------------------------------------------------------
>
> Key: HBASE-4473
> URL: https://issues.apache.org/jira/browse/HBASE-4473
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.90.4
> Reporter: Jean-Daniel Cryans
> Assignee: Jean-Daniel Cryans
> Priority: Minor
> Fix For: 0.90.5
>
> Attachments: HBASE-4473-0.90.patch, HBASE-4473-v2.patch,
> HBASE-4473.patch
>
>
> Minor annoyance when shutting down a cluster and the master is still
> receiving events from Zookeeper:
> {quote}
> 2011-09-22 23:53:01,552 DEBUG
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher:
> master:60000-0x3292d87deb004f Received InterruptedException, doing nothing
> here
> java.lang.InterruptedException
> at java.lang.Object.wait(Native Method)
> at java.lang.Object.wait(Object.java:485)
> at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1317)
> at org.apache.zookeeper.ZooKeeper.delete(ZooKeeper.java:726)
> at
> org.apache.hadoop.hbase.zookeeper.ZKUtil.deleteNode(ZKUtil.java:938)
> at
> org.apache.hadoop.hbase.zookeeper.ZKAssign.deleteNode(ZKAssign.java:407)
> at
> org.apache.hadoop.hbase.zookeeper.ZKAssign.deleteOpenedNode(ZKAssign.java:284)
> at
> org.apache.hadoop.hbase.master.handler.OpenedRegionHandler.process(OpenedRegionHandler.java:88)
> at
> org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:156)
> 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:662)
> ...
> 2011-09-22 23:53:01,558 DEBUG
> org.apache.hadoop.hbase.executor.ExecutorService: Executor service
> [MASTER_OPEN_REGION-sv2borg170:60000] not found in {}
> 2011-09-22 23:53:01,558 ERROR org.apache.zookeeper.ClientCnxn: Error while
> calling watcher
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.executor.ExecutorService.submit(ExecutorService.java:220)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.handleRegion(AssignmentManager.java:447)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.nodeDataChanged(AssignmentManager.java:546)
> at
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:281)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:530)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506)
> {quote}
> It's annoying because it then spams you with a bunch of NPEs that have
> nothing to do with the reason the Master is shutting down. Googling I saw
> someone also had that issue in June: http://pastebin.com/5Tqrj0nq
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