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From "Brandon Li (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6706) ZKFailoverController failed to recognize the quorum is not met
Date Fri, 18 Jul 2014 21:50:10 GMT
Brandon Li created HDFS-6706:

             Summary: 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 setup the ha.zookeeper.quorum to 3.
2. start two zookeeper servers.
3. do "hdfs zkfc -format", and then "hdfs zkfc"

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