Varun Thacker created SOLR-14967:
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Summary: CloudSolrClient does not pass _stateVer_ if
ModifiableSolrParams isn't used
Key: SOLR-14967
URL: https://issues.apache.org/jira/browse/SOLR-14967
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Varun Thacker
Attachments: zk-cpu-idle.png
If you are using CloudSolrClient and *only* if you are making a request with
ModifiableSolrParams , SolrJ passes __stateVer__ to the server on every
request -
[code|https://github.com/apache/lucene-solr/blob/3730719ff2ba9051278638e34bac91a4f44e9c3e/solr/solrj/src/java/org/apache/solr/client/solrj/impl/BaseCloudSolrClient.java#L920-L927]
This means callers who aren't passing ModifiableSolrParams ( let's say someone
is using {color:#000000}MultiMapSolrParams which is totally allowed and correct
) never end up updating it's state of the collection{color}
{color:#000000}The combination of Solr's handling of __stateVer_
(_https://issues.apache.org/jira/browse/SOLR-14966) and this Jira has a
terrible effect and causes every request to hit ZK ( this caused ZK cpu to fall
of a cliff in our case ){color}
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