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https://issues.apache.org/jira/browse/SOLR-14966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17899572#comment-17899572
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David Smiley commented on SOLR-14966:
-------------------------------------

Noted, but this seems more of a minor optimization opportunity than a bug.

> Solr should use cache collection state to validate _stateVer_ sent by SolrJ
> ---------------------------------------------------------------------------
>
>                 Key: SOLR-14966
>                 URL: https://issues.apache.org/jira/browse/SOLR-14966
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Varun Thacker
>            Priority: Major
>
> Whenever Solr receives a request with the __stateVer__  parameter it's 
> supposed to validate the version the server has vs what the client has. The 
> server was meant to cache the state.json for 2 seconds but it's not doing so.
>  
> If you follow this 
> [code|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java#L928]
>  you'll see _clusterState.getCollectionOrNull(coll)_ resulting it a ZK fetch 
> ( 
> [LazyCollectionRef|https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/common/cloud/ZkStateReader.java#L656]
>  ) . If the code was doing _clusterState.getCollectionOrNull(coll, true)_ 
> then we would call ZK only after the 2s TTL has expired



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