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https://issues.apache.org/jira/browse/SOLR-6538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14262145#comment-14262145
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ASF GitHub Bot commented on SOLR-6538:
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Github user andyetitmoves closed the pull request at:
https://github.com/apache/lucene-solr/pull/82
> Add an event API to register for cluster state updates and leader updates
> -------------------------------------------------------------------------
>
> Key: SOLR-6538
> URL: https://issues.apache.org/jira/browse/SOLR-6538
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Fix For: 5.0
>
>
> There is no way for plugins to listen for cluster state updates or leader
> changes short of adding their own watches on ZK nodes directly.
> Let's add an event listener API to listen for such events.
> A simple use-case is a long running request handler (such as DIH) which:
> # pulls data from other sources
> # runs only on leaders (or really just one node per collection or shard)
> # should fail-over automatically to other nodes
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