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From Randgalt <...@git.apache.org>
Subject [GitHub] zookeeper issue #136: [ZOOKEEPER-1416] Persistent Recursive Watch
Date Wed, 16 Aug 2017 19:35:28 GMT
Github user Randgalt commented on the issue:

    https://github.com/apache/zookeeper/pull/136
  
    Per 1. I posted some performance numbers in the issue. There's a definite hit but it's
worth it in my view. We should discuss this.
    
    Per 2. What this PR is aimed at is users of Curator's TreeCache - one of the most widely
used "recipes" in the library. Many users want to know everything that happens to a tree of
ZNodes. With the current APIs this is extraordinarily difficult (thus the complexity of the
TreeCache code) and inefficient. You must set 2 watches for every single node in the tree
(data and children) and then work very hard to keep those watches set as they trigger, through
network issues, etc.
    
    Per 3. This PR does not guarantee that you will see all events. I'll double check the
doc to make sure that that's clear. These watches behave exactly as other watches in ZK other
than they don't remove themselves when triggered.


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