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https://issues.apache.org/jira/browse/SOLR-5381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803676#comment-13803676
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Mark Miller commented on SOLR-5381:
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bq. The only instance when a node needs to know about the state of other shards
is when it needs to forward a request.
It would like to know the state of the other shards as it often has to query
against all the shards in a collection and we don't want to keep hitting a
shard that is down and we don't want to take forever to hit a shard that just
came up ...
bq. That information can be looked up on demand and cached.
I don't think I'm sold on that yet. Perhaps you need to do stuff like that for
truly massive clusters, but until we proof point everything on a few thousand
nodes, it doesn't seem worth this kind of change to me.
bq. Nobody should need to watch other shards on a realtime basis. I
I do think it's important that we continue to propagate cluster state changes
relatively quickly after they happen.
> 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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