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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6706) ZKFailoverController failed to recognize the quorum is not met
Date Tue, 22 Jul 2014 02:44:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069731#comment-14069731
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Yongjun Zhang commented on HDFS-6706:
-------------------------------------

HI [~brandonli], thanks for the explanation!


> ZKFailoverController failed to recognize the quorum is not met
> --------------------------------------------------------------
>
>                 Key: HDFS-6706
>                 URL: https://issues.apache.org/jira/browse/HDFS-6706
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>
> Thanks Kenny Zhang for finding this problem.
> The zkfc cannot be startup due to ha.zookeeper.quorum is not met. "zkfc -format" doesn't
log the real problem. And then user will see the error message instead of the real issue when
starting zkfc:
> 2014-07-01 17:08:17,528 FATAL ha.ZKFailoverController (ZKFailoverController.java:doRun(213))
- Unable to start failover controller. Parent znode does not exist.
> Run with -formatZK flag to initialize ZooKeeper.
> 2014-07-01 16:00:48,678 FATAL ha.ZKFailoverController (ZKFailoverController.java:fatalError(365))
- Fatal error occurred:Received create error from Zookeeper. code:NONODE for path /hadoop-ha/prodcluster/ActiveStandbyElectorLock
> 2014-07-01 17:24:44,202 - INFO ProcessThread(sid:2 cport:-1)::PrepRequestProcessor@627
- Got user-level KeeperException when processing sessionid:0x346f36191250005 type:create cxid:0x2
zxid:0xf00000033 txntype:-1 reqpath:n/a Error Path:/hadoop-ha/prodcluster/ActiveStandbyElectorLock
Error:KeeperErrorCode = NodeExists for /hadoop-ha/prodcluster/ActiveStandbyElectorLock
> To reproduce the problem:
> 1. use HDFS cluster with automatic HA enable and set the ha.zookeeper.quorum to 3.
> 2. start two zookeeper servers.
> 3. do "hdfs zkfc -format", and then "hdfs zkfc"



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