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From "Andor Molnar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-2307) ZooKeeper not starting because acceptedEpoch is less than the currentEpoch
Date Fri, 26 Oct 2018 09:59:00 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andor Molnar updated ZOOKEEPER-2307:
------------------------------------
    Priority: Major  (was: Critical)

> 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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