Github user lvfangmin commented on the issue:
https://github.com/apache/zookeeper/pull/632
This is a really useful feature, which helps us find multiple data
inconsistent issues, like ZOOKEEPER-3144, ZOOKEEPER-3127, ZOOKEEPER-3125.
It can avoid introducing new inconsistent bugs in ZooKeeper in the future,
so please take a look when you have time. I'll introduce the 2nd part after
this got reviewed and merged.
For performance, we saw some very minor impact, will provide the
micro-benchmark result.
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