Alan Woodward commented on SOLR-9659:

I started out by looking at Curator, but this API ended up being at a higher 
level.  Here, clients don't need to care at all about Watcher objects, or ZK 
exceptions, or anything like that.  Instead, you just say "I'm interesting in 
path x/y/z - when the data there changes, call me with the new contents"; or 
"I'm interested in the children of path z/q - when the child list changes, call 
me with the new list".

> Add zookeeper DataWatch API
> ---------------------------
>                 Key: SOLR-9659
>                 URL: https://issues.apache.org/jira/browse/SOLR-9659
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Alan Woodward
>            Assignee: Alan Woodward
>         Attachments: SOLR-9659.patch
> We have several components which need to set up watches on ZooKeeper nodes 
> for various aspects of cluster management.  At the moment, all of these 
> components do this themselves, leading to large amounts of duplicated code, 
> and complicated logic for dealing with reconnections, etc, scattered across 
> the codebase.  We should replace this with a simple API controlled by 
> SolrZkClient, which should make the code more robust, and testing 
> considerably easier.

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