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https://issues.apache.org/jira/browse/LUCENE-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977375#action_12977375
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Michael McCandless commented on LUCENE-2837:
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bq. can we just make the executorservice arg mandatory for parallel?
The thing is, I'd like for "use threads" to be easy for the app/user.
But: we aren't near a good solution here (the threads are tied to segments,
which I don't like).
So I agree, for now, how about I remove the IS ctor that takes boolean
useThreads, leaving only the one that takes an ES? And in the jdoc I can say
"for example here's how to get an ES, but, be sure you properly shut it down
when done, and then close the IS/IR"?
Ideally, in the future, we make it very easy to use concurrency within a single
search...
> Collapse Searcher/Searchable/IndexSearcher; remove contrib/remote; merge PMS
> into IndexSearcher
> -----------------------------------------------------------------------------------------------
>
> Key: LUCENE-2837
> URL: https://issues.apache.org/jira/browse/LUCENE-2837
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Michael McCandless
> Fix For: 4.0
>
> Attachments: LUCENE-2837.patch
>
>
> We've discussed cleaning up our *Searcher stack for some time... I
> think we should try to do this before releasing 4.0.
> So I'm attaching an initial patch which:
> * Removes Searcher, Searchable, absorbing all their methods into
> IndexSearcher
> * Removes contrib/remote
> * Removes MultiSearcher
> * Absorbs ParallelMultiSearcher into IndexSearcher (ie you can now
> pass useThreads=true, or a custom ES to the ctor)
> The patch is rough -- I just ripped stuff out, did search/replace to
> IndexSearcher, etc. EG nothing is directly testing using threads with
> IndexSearcher, but before committing I think we should add a
> newSearcher to LuceneTestCase, which randomly chooses whether the
> searcher uses threads, and cutover tests to use this instead of making
> their own IndexSearcher.
> I think MultiSearcher has a useful purpose, but as it is today it's
> too low-level, eg it shouldn't be involved in rewriting queries: the
> Query.combine method is scary. Maybe in its place we make a higher
> level class, with limited API, that's able to federate search across
> multiple IndexSearchers? It'd also be able to optionally use thread
> per IndexSearcher.
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