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Brandon Li commented on HDFS-6706: ---------------------------------- [~yzhangal], I should have added more explanation. In the case, the 3 zookeeper was not correctly configured as an ensemble. Basically none of them was in an ensemble. However, all of them were configured in core-site.xml in "ha.zookeeper.quorum". When zkfs is started, it talked to a different zk server which is not the previously formatted one. > 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" -- This message was sent by Atlassian JIRA (v6.2#6252)