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https://issues.apache.org/jira/browse/HDFS-3477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-3477:
------------------------------
Attachment: hdfs-3477.txt
Fix inconsistent synchronization findbugs - just had to add a synchronized
block around an access to the {{zk}} variable in the watcher
> FormatZK and ZKFC startup can fail due to zkclient connection establishment
> delay
> ---------------------------------------------------------------------------------
>
> Key: HDFS-3477
> URL: https://issues.apache.org/jira/browse/HDFS-3477
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: auto-failover
> Affects Versions: 2.0.0-alpha
> Reporter: suja s
> Assignee: Rakesh R
> Attachments: HDFS-3477.1.patch, HDFS-3477.2.patch, HDFS-3477.3.patch,
> HDFS-3477.3.patch, HDFS-3477.patch, hdfs-3477.txt, hdfs-3477.txt
>
>
> Format and ZKFC startup flows continue further after creation of zkclient
> connection without waiting to check whether the connection is completely
> established. This leads to failure at the subsequent point if connection was
> not complete by then.
> Exception trace for format
> {noformat}
> 12/05/30 19:48:24 INFO zookeeper.ClientCnxn: Socket connection established to
> HOST-xx-xx-xx-55/xx.xx.xx.55:2182, initiating session
> 12/05/30 19:48:24 INFO zookeeper.ClientCnxn: Session establishment complete
> on server HOST-xx-xx-xx-55/xx.xx.xx.55:2182, sessionid = 0x1379da4660c0014,
> negotiated timeout = 5000
> 12/05/30 19:48:24 WARN ha.ActiveStandbyElector: Ignoring stale result from
> old client with sessionId 0x1379da4660c0014
> 12/05/30 19:48:24 INFO zookeeper.ZooKeeper: Session: 0x1379da4660c0014 closed
> 12/05/30 19:48:24 INFO zookeeper.ClientCnxn: EventThread shut down
> Exception in thread "main" java.io.IOException: Couldn't determine existence
> of znode '/hadoop-ha/hacluster'
> at
> org.apache.hadoop.ha.ActiveStandbyElector.parentZNodeExists(ActiveStandbyElector.java:263)
> at
> org.apache.hadoop.ha.ZKFailoverController.formatZK(ZKFailoverController.java:257)
> at
> org.apache.hadoop.ha.ZKFailoverController.doRun(ZKFailoverController.java:195)
> at
> org.apache.hadoop.ha.ZKFailoverController.access$000(ZKFailoverController.java:58)
> at
> org.apache.hadoop.ha.ZKFailoverController$1.run(ZKFailoverController.java:163)
> at
> org.apache.hadoop.ha.ZKFailoverController$1.run(ZKFailoverController.java:159)
> at
> org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:438)
> at
> org.apache.hadoop.ha.ZKFailoverController.run(ZKFailoverController.java:159)
> at
> org.apache.hadoop.hdfs.tools.DFSZKFailoverController.main(DFSZKFailoverController.java:171)
> Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException:
> KeeperErrorCode = ConnectionLoss for /hadoop-ha/hacluster
> at
> org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
> at
> org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1021)
> at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1049)
> at
> org.apache.hadoop.ha.ActiveStandbyElector.parentZNodeExists(ActiveStandbyElector.java:261)
> ... 8 more
> {noformat}
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