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https://issues.apache.org/jira/browse/SOLR-9659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15586044#comment-15586044
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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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