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From "Ted Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4875) ZKLeaderManager.handleLeaderChange() doesn't handle KeeperException$SessionExpiredException
Date Tue, 29 Nov 2011 02:19:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159047#comment-13159047
] 

Ted Yu commented on HBASE-4875:
-------------------------------

In HMaster, this.zooKeeper is replenished:
{code}
  private boolean tryRecoveringExpiredZKSession() throws InterruptedException,
      IOException, KeeperException {
    this.zooKeeper = new ZooKeeperWatcher(conf, MASTER + ":"
        + this.serverName.getPort(), this, true);
{code}
To handle expired session in a general way, we need to update the ZooKeeperWatcher of the
caller.
                
> ZKLeaderManager.handleLeaderChange() doesn't handle KeeperException$SessionExpiredException
> -------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4875
>                 URL: https://issues.apache.org/jira/browse/HBASE-4875
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.0
>            Reporter: Ted Yu
>
> TestMasterFailover#testSimpleMasterFailover has failed twice in a row for builds 15 and
16.
> From https://builds.apache.org/view/G-L/view/HBase/job/HBase-0.92-security/16/testReport/org.apache.hadoop.hbase.master/TestMasterFailover/testSimpleMasterFailover/:
> {code}
> 2011-11-26 01:34:49,217 DEBUG [RegionServer:0;hemera.apache.org,57516,1322271278190-EventThread]
zookeeper.ZooKeeperWatcher(257): regionserver:57516-0x133dd8281300003 Received ZooKeeper Event,
type=NodeDeleted, state=SyncConnected, path=/hbase/tokenauth/keymaster
> 2011-11-26 01:34:49,217 WARN  [Thread-1-EventThread] zookeeper.ZKUtil(234): master:52934-0x133dd8281300001
Unable to set watcher on znode /hbase/tokenauth/keymaster
> org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode = Session
expired for /hbase/tokenauth/keymaster
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:127)
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> 	at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1003)
> 	at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:154)
> 	at org.apache.hadoop.hbase.zookeeper.ZKUtil.watchAndCheckExists(ZKUtil.java:225)
> 	at org.apache.hadoop.hbase.zookeeper.ZKLeaderManager.handleLeaderChange(ZKLeaderManager.java:85)
> 	at org.apache.hadoop.hbase.zookeeper.ZKLeaderManager.nodeDeleted(ZKLeaderManager.java:78)
> 	at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:281)
> 	at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:521)
> 	at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:497)
> 2011-11-26 01:34:49,218 ERROR [Thread-1-EventThread] zookeeper.ZooKeeperWatcher(403):
master:52934-0x133dd8281300001 Received unexpected KeeperException, re-throwing exception
> org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode = Session
expired for /hbase/tokenauth/keymaster
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:127)
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> 	at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1003)
> 	at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:154)
> 	at org.apache.hadoop.hbase.zookeeper.ZKUtil.watchAndCheckExists(ZKUtil.java:225)
> 	at org.apache.hadoop.hbase.zookeeper.ZKLeaderManager.handleLeaderChange(ZKLeaderManager.java:85)
> 	at org.apache.hadoop.hbase.zookeeper.ZKLeaderManager.nodeDeleted(ZKLeaderManager.java:78)
> 	at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:281)
> 	at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:521)
> 	at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:497)
> 2011-11-26 01:34:49,216 DEBUG [RegionServer:2;hemera.apache.org,44702,1322271278232-EventThread]
zookeeper.ZKUtil(230): hconnection-0x133dd8281300009 /hbase/master does not exist. Watcher
is set.
> 2011-11-26 01:34:49,215 DEBUG [Thread-1-EventThread] zookeeper.ZKUtil(230): master:44883-0x133dd8281300002
/hbase/master does not exist. Watcher is set.
> 2011-11-26 01:34:49,219 DEBUG [Thread-1-EventThread] master.ActiveMasterManager(104):
No master available. Notifying waiting threads
> 2011-11-26 01:34:49,215 INFO  [Master:1;hemera.apache.org,52934,1322271278115] master.HMaster(338):
HMaster main thread exiting
> {code}

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