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https://issues.apache.org/jira/browse/SOLR-2548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040124#comment-13040124
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Adrien Grand commented on SOLR-2548:
------------------------------------
Hello Janne,
Is there any reason why you didn't make facet queries and facet ranges
multi-threaded ?
You create a thread pool with ${nProcessors} worker threads locally, meaning
that a server with 8 processors serving 10 concurrent requests would have to
start and then run 80 threads simultaneously before stopping each of them. At
this level, multi-threaded facet computation may be slower than single-threaded
facet computation. I suggest instead to share a single thread pool for every
facet computation with coreSize=0, a SynchronousQueue, and
ThreadPoolExecutor.CallerRunsPolicy as a RejectExecutionHandler. This way you
would avoid the overhead of starting and then stopping threads and have a
better control over the total number of threads computing facets.
> 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
> Priority: Minor
> Labels: facet
> Attachments: SOLR-2548.patch, SOLR-2548_for_31x.patch
>
>
> Add multithreading support for faceting.
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