Github user yunfan123 commented on the issue:
https://github.com/apache/zookeeper/pull/262
Hi, I think 48 bits low is better for large throughput zk cluster.
Another benefits is when use 48 bits low we assuming the epoch low than
(1<<16), so we can 16 bits high to judge whether it is old version or new
version.
So use 48 bits low we can make the upgrade progress smoothly
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