Github user yunfan123 commented on the issue:
https://github.com/apache/zookeeper/pull/262
Hi, @asdf2014
In most cases, I don't think the epoch can overflow 16-bit.
In general, zookeeper leader election is very rare, and it may take several
seconds even several minutes to finish leader election.
And zookeeper is totally unavailable during leader election.
If the zookeeper that you use can overflow 16-bits, it turns out the
zookeeper you used is totally unreliable.
Finally, compatible with old version is really important.
If not compatible with old versions, I must restart all my zookeeper nodes.
All of nodes need reload snapshot and log from disk, it will cost a lot of
time.
I believe this upgrade process is unacceptable by most zookeeper users.
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