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Date: Sat, 26 Nov 2011 05:47:39 +0000 (UTC)
From: "Ted Yu (Commented) (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-4875)
 ZKLeaderManager.handleLeaderChange() doesn't handle
 KeeperException$SessionExpiredException
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    [ https://issues.apache.org/jira/browse/HBASE-4875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157376#comment-13157376 ] 

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

I think we can follow the example from Master dealing with SessionExpiredException:
{code}
    if (t != null && t instanceof KeeperException.SessionExpiredException) {
      try {
        LOG.info("Primary Master trying to recover from ZooKeeper session " +
            "expiry.");
        return !tryRecoveringExpiredZKSession();
{code}
                
> 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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