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https://issues.apache.org/jira/browse/SOLR-5381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803686#comment-13803686
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Noble Paul commented on SOLR-5381:
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bq.t would like to know the state of the other shards as it often has to query
against all the shards in a collection
You are missing the point that it's very unlikely for anyone to query across
all shards in a VERY LARGE cluster. It is going to be almost useless and will
bring the whole cluster down to a crawl. A node needs to know about other
shards only when it gets a request /update for another shard. But even that may
be a rare case if you use SolrJ as your client which will route requests at the
client level. We will have to attack this problem sooner or later if we
actually take SolrCloud to a very large scale .I'm not saying this has to be
the first step. We will pluck the low hanging fruits first of course
> 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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