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https://issues.apache.org/jira/browse/CURATOR-476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16576199#comment-16576199
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Rohan Suri commented on CURATOR-476:
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The fix is ready, I'll be raising a PR real soon.
> PathChildrenCache never get initialized if a child dies before a data watch
> is registered for it
> ------------------------------------------------------------------------------------------------
>
> Key: CURATOR-476
> URL: https://issues.apache.org/jira/browse/CURATOR-476
> Project: Apache Curator
> Issue Type: Bug
> Components: Recipes
> Reporter: Rohan Suri
> Priority: Major
>
> PathChildrenCache started with
> PathChildrenCache.StartMode.POST_INITIALIZED_EVENT there could be the
> following scenario:
> 1. PCC calls getChildren("../parent") and gets the list of it's children
> 2. PCC calls processChildren(...) where it puts them into it's \{initialSet}
> – set of children whose data it will fetch and cache
> 3. Later in the same method it calls getDataAndStat(..."/parent/somechild")
> where it calls getData(...) on this child and registers a dataWatcher for
> this child
> Midst of step 2&3, child node could get deleted – but since step 3 hasn't
> completed yet, the dataWatcher isn't triggered (since it is not even
> registered)
> and we miss the NodeDeleted event.
> Since our \{initialSet} still contains the child path, the initialized event
> is never fired.
> The fix:
> As of now there's only one codepath to removing a path from the \{initialSet}
> (from the data watcher)
> The remove should also be called in the callback of our
> getData(..."/parent/somechild") being done in Step 3 if the
> resultCode=-101(KeeperException.NoNode)
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