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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