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https://issues.apache.org/jira/browse/SOLR-5381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803672#comment-13803672
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Mark Miller commented on SOLR-5381:
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bq. In a big enough cluster you can expect a state change event almost every
few seconds. So , it is not ideal to update the state on each node all the time
I don't believe that is the case for a couple thousand node cluster. And while
not ideal, the size of the file at a couple thousand nodes and network speeds
keeps it from being any kind of bottle neck until you can scale well beyond
what SolrCloud can do right now due to many other factors I think.
> Split Clusterstate and scale
> -----------------------------
>
> Key: SOLR-5381
> URL: https://issues.apache.org/jira/browse/SOLR-5381
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Reporter: Noble Paul
> Assignee: Noble Paul
> Original Estimate: 2,016h
> Remaining Estimate: 2,016h
>
> clusterstate.json is a single point of contention for all components in
> SolrCloud. It would be hard to scale SolrCloud beyond a few thousand nodes
> because there are too many updates and too many nodes need to be notified of
> the changes. As the no:of nodes go up the size of clusterstate.json keeps
> going up and it will soon exceed the limit impossed by ZK.
> The first step is to store the shards information in separate nodes and each
> node can just listen to the shard node it belongs to. We may also need to
> split each collection into its own node and the clusterstate.json just
> holding the names of the collections .
> This is an umbrella issue
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