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From skamille <...@git.apache.org>
Subject [GitHub] zookeeper issue #136: [ZOOKEEPER-1416] Persistent Recursive Watch
Date Fri, 18 Aug 2017 14:44:46 GMT
Github user skamille commented on the issue:

    https://github.com/apache/zookeeper/pull/136
  
    > 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.
    
    Well, I would personally expect that a watch that doesn't remove itself when triggered
is going to never drop an event so long as the session is alive. My understanding of the raft-based
stores is that they can give you the historical change log that guarantees it won't lose events.
I haven't done the mental exercise of determining if we could do that in ZK (probably? maybe?)
but it is certainly a difference that partially arises from the underlying design differences
between the systems, and we should be more specific about what will really happen with this
feature.


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