Github user asdf2014 commented on the issue:
https://github.com/apache/zookeeper/pull/262
Hi, @yunfan123 . Thank you for your suggestion. As you said in the opinion,
so that it can guarantee a smooth upgrade. However, if the 16-bit `epoch`
overflow rather than the `counter` overflow, it will make Zookeeper cannot keep
provide services by re-election anymore. So, i thought we should keep enough
space for `epoch`. What you think?
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