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https://issues.apache.org/jira/browse/SOLR-8988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15294136#comment-15294136
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Dennis Gove commented on SOLR-8988:
-----------------------------------
[~k317h], could you explain the javadocs on FACET_DISTRIB_MCO a little bit
more? I don't quite follow the documentation on it
{code}
+ public static final String FACET_DISTRIB = FACET + ".distrib";
+
+ /**
+ * The default mincount to request on distributed facet queries.
+ * This param only applies to COUNT sorted queries which have a limit > -1
+ *
+ * Default values:
+ * Sort COUNT and facet.limit = -1: Math.min(facet.minCount, 1)
+ * Sort COUNT and facet.limit > 0: 0
+ * Sort INDEX and facet.mincount <= 1: facet.mincount
+ * Sort INDEX and facet.mincount > 1: (int) Math.ceil((double)
dff.minCount / rb.slices.length)
+ *
+ * EXPERT
+ */
+
+ public static final String FACET_DISTRIB_MCO = FACET_DISTRIB + ".mco";
+
{code}
> Improve facet.method=fcs performance in SolrCloud
> -------------------------------------------------
>
> Key: SOLR-8988
> URL: https://issues.apache.org/jira/browse/SOLR-8988
> Project: Solr
> Issue Type: Improvement
> Reporter: Keith Laban
> Attachments: SOLR-8988.patch, SOLR-8988.patch, Screen Shot 2016-04-25
> at 2.54.47 PM.png, Screen Shot 2016-04-25 at 2.55.00 PM.png
>
>
> This relates to SOLR-8559 -- which improves the algorithm used by fcs
> faceting when {{facet.mincount=1}}
> This patch allows {{facet.mincount}} to be sent as 1 for distributed queries.
> As far as I can tell there is no reason to set {{facet.mincount=0}} for
> refinement purposes . After trying to make sense of all the refinement logic,
> I cant see how the difference between _no value_ and _value=0_ would have a
> negative effect.
> *Test perf:*
> - ~15million unique terms
> - query matches ~3million documents
> *Params:*
> {code}
> facet.mincount=1
> facet.limit=500
> facet.method=fcs
> facet.sort=count
> {code}
> *Average Time Per Request:*
> - Before patch: ~20seconds
> - After patch: <1 second
> *Note*: all tests pass and in my test, the output was identical before and
> after patch.
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