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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3477) FormatZK and ZKFC startup can fail due to zkclient connection establishment delay
Date Thu, 12 Jul 2012 10:30:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13412675#comment-13412675
] 

Rakesh R commented on HDFS-3477:
--------------------------------

Added links to HDFS-3635 as I feel the cause is same and failing after timeout:
{code}java.lang.Exception: test timed out after 30000 milliseconds
	at java.lang.Object.wait(Native Method)
	at org.apache.hadoop.ha.ZKFailoverController.waitForActiveAttempt(ZKFailoverController.java:457)
	at org.apache.hadoop.ha.ZKFailoverController.doGracefulFailover(ZKFailoverController.java:645)
	at org.apache.hadoop.ha.ZKFailoverController.access$400(ZKFailoverController.java:58)
	at org.apache.hadoop.ha.ZKFailoverController$3.run(ZKFailoverController.java:590)
	at org.apache.hadoop.ha.ZKFailoverController$3.run(ZKFailoverController.java:587){code}
                
> 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: 2.0.1-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
>
>
> 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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