Varun Thacker created SOLR-14966:
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Summary: 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
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Varun Thacker
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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