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https://issues.apache.org/jira/browse/ZOOKEEPER-2307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16665018#comment-16665018
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Mohammad Arshad commented on ZOOKEEPER-2307:
--------------------------------------------
Work for this issue was completed long back. Now the last given patch need to
be re based.
I will rebase the changes and raise a PR.
> 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: Mohammad Arshad
> Assignee: Mohammad Arshad
> Priority: Major
> Fix For: 3.6.0, 3.5.5
>
> Attachments: ZOOKEEPER-2307-01.patch, ZOOKEEPER-2307-02.patch,
> ZOOKEEPER-2307-03.patch, ZOOKEEPER-2307-04.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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