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https://issues.apache.org/jira/browse/SOLR-8323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15238207#comment-15238207
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Scott Blum commented on SOLR-8323:
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fetchCollectionState() expectExists parameter doesn't make sense to me... I
would have thought that if a non-null watcher is passed in, you always want to
setup an exists watch if the node doesn't exist. And if a null watcher is
passed in, calling exists() is a waste of energy.
> Add CollectionWatcher API to ZkStateReader
> ------------------------------------------
>
> Key: SOLR-8323
> URL: https://issues.apache.org/jira/browse/SOLR-8323
> Project: Solr
> Issue Type: Improvement
> Affects Versions: master
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Attachments: SOLR-8323.patch, SOLR-8323.patch, SOLR-8323.patch
>
>
> An API to watch for changes to collection state would be a generally useful
> thing, both internally and for client use.
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