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Cisco Bug: CSCvt39916 - Zookeeper out-of-sync situation during quick keepalived flaps

Last Modified

Oct 07, 2020

Products (1)

  • Cisco Ultra Services Framework

Known Affected Releases


Description (partial)

Symptoms are varied. One possible symptom is the removal of functioning VMs from the system leading to potential service outages.

On the EMs, examination of the zookeeper logs under /var/log/em/zookeeper show a continuous stream of warning messages complaining that the accepted epoch is greater than the leader epoch.

Here is an example:

2020-02-18 08:43:26,900 [myid:51] - WARN  [QuorumPeer[myid=51]/] - Exception when following the leader Leaders epoch, 6 is less than accepted epoch, 9
        at org.apache.zookeeper.server.quorum.Learner.registerWithLeader(
        at org.apache.zookeeper.server.quorum.Follower.followLeader(

2 EM deployments where connectivity is impacted simultaneously on management and orchestration networks between the 2 EM instances.
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