[jira] Commented: (LUCENE-2837) Collapse Searcher/Searchable/IndexSearcher; remove contrib/remote; merge PMS into IndexSearcher

["Michael McCandless (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977375#action_12977375 ] 

Michael McCandless commented on LUCENE-2837:
--------------------------------------------

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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