Hi Ted, I think the problem you are seeing is due to this issue:
which is fixed in 3.3.2.
On Apr 20, 2010, at 11:14 PM, Ted Dunning wrote:
> We have just done an upgrade of ZK to 3.3.0. Previous to this, ZK
> has been
> up for about a year with no problems.
> On two nodes, we killed the previous instance and started the 3.3.0
> instance. The first node was a follower and the second a leader.
> All went according to plan and no clients seemed to notice
> anything. The
> stat command showed connections moving around as expected and all
> indicators were normal.
> When we did the third node, we saw this in the log:
> 2010-04-20 14:07:49,010 - FATAL [QuorumPeer:/
> 0.0.0.0:2181:Follower@71] -
> Leader epoch 18 is less than our epoch 19
> The third node refused all connections.
> We brought down the third node, wiped away its snapshot, restarted
> and it
> joined without complaint. Note that the third node
> was originally a follower and had never been a leader during the
> Does anybody know why this happened?
> We are fully upgraded and there was no interruption to normal
> service, but
> this seems strange.
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