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From Shawn Heisey <>
Subject Re: When does Solr write in Zookeeper ?
Date Mon, 18 Nov 2019 18:28:36 GMT
On 11/18/2019 8:39 AM, Dominique Bejean wrote:
> How Solr nodes know that something was changed in Zookeeper by an other
> node ? Is there any notification from ZK or do Solr nodes read
> systematically in ZK (without local caching) ?

This is built-in functionality of ZooKeeper.  The client allows setting 
what's called watches, which trigger when the watched node changes.

This functionality is used extensively in SolrCloud.


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