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Posted to dev@zookeeper.apache.org by "Arshad Mohammad (JIRA)" <ji...@apache.org> on 2015/11/02 08:24:27 UTC
[jira] [Commented] (ZOOKEEPER-2307) ZooKeeper not starting because
acceptedEpoch is less than the currentEpoch
[ https://issues.apache.org/jira/browse/ZOOKEEPER-2307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14984821#comment-14984821 ]
Arshad Mohammad commented on ZOOKEEPER-2307:
--------------------------------------------
The issue seems similar but actually it is not. Scenarios are completely different.
> ZooKeeper not starting because acceptedEpoch is less than the currentEpoch
> --------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2307
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2307
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Reporter: Arshad Mohammad
> Assignee: Arshad Mohammad
> Priority: Critical
> Fix For: 3.5.2, 3.6.0
>
> Attachments: ZOOKEEPER-2307-01.patch
>
>
> This issue occurred in one of our test environment where disk was being changed to read only very frequently.
> The the scenario is as follows:
> # Configure three node ZooKeeper cluster, lets say nodes are A, B and C
> # Start A and B. Both A and B start successfully, quorum is running.
> # Start C, because of IO error C fails to update acceptedEpoch file. But C also starts successfully, joins the quorum as follower
> # Stop C
> # Start C, bellow exception with message "The accepted epoch, 0 is less than the current epoch, 1" is thrown
> {code}
> 2015-10-29 16:52:32,942 [myid:3] - ERROR [main:QuorumPeer@784] - Unable to load database on disk
> java.io.IOException: The accepted epoch, 0 is less than the current epoch, 1
> at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:781)
> at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:720)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:202)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:139)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:88)
> 2015-10-29 16:52:32,946 [myid:3] - ERROR [main:QuorumPeerMain@111] - Unexpected exception, exiting abnormally
> java.lang.RuntimeException: Unable to run quorum server
> at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:785)
> at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:720)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:202)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:139)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:88)
> Caused by: java.io.IOException: The accepted epoch, 0 is less than the current epoch, 1
> at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:781)
> {code}
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