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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