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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:
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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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