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https://issues.apache.org/jira/browse/SOLR-5381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13804385#comment-13804385
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Noble Paul commented on SOLR-5381:
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[~markrmil...@gmail.com]  Whatever we are building, will not be committed to 
trunk anytime soon . This being a big ticket item it will probably have to live 
in another branch for  a while for others to see and evaluate. But someone has 
to start it at some point

If you have to identify the top 5 low hanging fruits what would they be?

> 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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