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https://issues.apache.org/jira/browse/SOLR-7716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14598009#comment-14598009
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Erick Erickson commented on SOLR-7716:
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SOLR-5128 mentions allowing parameters like maxShardsPerNode to be changed
after collection creation.
> misleading errors reported for CREATESHARD if new shard would exceed
> maxShardsPerNode
> -------------------------------------------------------------------------------------
>
> Key: SOLR-7716
> URL: https://issues.apache.org/jira/browse/SOLR-7716
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: Trunk, 5x
> Reporter: Erick Erickson
> Priority: Minor
>
> If I create a collection with implicit routing and, say, maxShardsPerNode=3,
> then start creating shards, when I create the 4th shard I get an error. So
> far so good. The error is very misleading though, see below.
> Saw this on a degenerate case of a single Solr instance, not sure if you get
> the same error on a multi-node cluster.
> <str name="Operation createshard caused exception:">
> ...... Cannot create collection eoe. No live Solr-instances
> </str>
> <lst name="exception">
> <str name="msg">Cannot create collection eoe. No live Solr-instances</str>
> <int name="rspCode">400</int>
> .
> .
> .
> Related question is I don't think there's a graceful way to increase
> maxShardsPerNode after the collection is created.
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