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https://issues.apache.org/jira/browse/SOLR-2548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762750#comment-13762750
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David Smiley commented on SOLR-2548:
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bq. If any of the faceting methods are blocked on IO (e.g. docvalues faceting),
this will close file descriptors with NIO/MMAP directory implementations: see
the documentation in org.apache.lucene.store for more information.
Ok; I'll look into that later.
{quote}
> Only the first facet.threads worth of facets are actually done concurrently;
> the rest are done serially.
I remember that being my initial reaction too - but then when you think a
little about it, you realize that it's not the case.
{quote}
Aha; now I see it! This is confusing code -- adding to the
completionService/executor in two different loops; and the 2nd loop is
particularly un-obvious to me.
bq. Just as a (likely controversial) suggestion in general here, its hard to
"see" the single-threaded case (which is the most common case).
+0 not controversial to me
> Multithreaded faceting
> ----------------------
>
> Key: SOLR-2548
> URL: https://issues.apache.org/jira/browse/SOLR-2548
> Project: Solr
> Issue Type: Improvement
> Components: search
> Affects Versions: 3.1
> Reporter: Janne Majaranta
> Assignee: Erick Erickson
> Priority: Minor
> Labels: facet
> Fix For: 4.5, 5.0
>
> Attachments: SOLR-2548_4.2.1.patch, SOLR-2548_for_31x.patch,
> SOLR-2548_multithreaded_faceting,_dsmiley.patch, SOLR-2548.patch,
> SOLR-2548.patch, SOLR-2548.patch, SOLR-2548.patch, SOLR-2548.patch,
> SOLR-2548.patch
>
>
> Add multithreading support for faceting.
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