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https://issues.apache.org/jira/browse/LUCENE-6294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337863#comment-14337863
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David Smiley commented on LUCENE-6294:
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I didn't look it over in great detail but I like it. At first I was hoping
that there might be a Collector subclass to declare it's parallel-izability
with the reduce method but then realized it wouldn't look good since the
factory method to create itself wouldn't feel right.
> Generalize how IndexSearcher parallelizes collection execution
> --------------------------------------------------------------
>
> Key: LUCENE-6294
> URL: https://issues.apache.org/jira/browse/LUCENE-6294
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Trivial
> Attachments: LUCENE-6294.patch
>
>
> IndexSearcher takes an ExecutorService that can be used to parallelize
> collection execution. This is useful if you want to trade throughput for
> latency.
> However, this executor service will only be used if you search for top docs.
> In that case, we will create one collector per slide and call TopDocs.merge
> in the end. If you use search(Query, Collector), the executor service will
> never be used.
> But there are other collectors that could work the same way as top docs
> collectors, eg. TotalHitCountCollector. And maybe also some of our users'
> collectors. So maybe IndexSearcher could expose a generic way to take
> advantage of the executor service?
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