Arshad Mohammad created ZOOKEEPER-2307:
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Summary: 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
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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