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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-6294) Generalize how IndexSearcher parallelizes collection execution
Date Wed, 25 Feb 2015 12:42:04 GMT
Adrien Grand created LUCENE-6294:
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             Summary: 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


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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