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https://issues.apache.org/jira/browse/SOLR-7614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14566557#comment-14566557
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Yonik Seeley commented on SOLR-7614:
------------------------------------
This may be the root cause of SOLR-7605
> Distributed Pivot Facet not thread safe
> ---------------------------------------
>
> Key: SOLR-7614
> URL: https://issues.apache.org/jira/browse/SOLR-7614
> Project: Solr
> Issue Type: Bug
> Reporter: Yonik Seeley
>
> I just happened to notice the following added to FacetComponent:
> {code}
> /**
> * Incremented counter used to track the values being refined in a given
> request.
> * This counter is used in conjunction with {@link PivotFacet#REFINE_PARAM}
> to identify
> * which refinement values are associated with which pivots.
> */
> int pivotRefinementCounter = 0;
> {code}
> That counter is incremented for each refinement request for correlation, and
> then reset to 0 at the end. This will obviously break for concurrent
> distributed pivot facet requests.
> pivotRefinementCounter should be moved to per-request storage.
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