[jira] [Updated] (LUCENE-6561) Add a TermContextCache to IndexSearcher

["Alan Woodward (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-6561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Woodward updated LUCENE-6561:
----------------------------------
    Attachment: LUCENE-6561.patch

Very rough patch that adds a TermContextCache to IndexSearcher, and moves TermContext.build() to IndexSearcher.getTermContext(Term).  There are three cache implementations, one no-op (the default), one that caches everything, and a dumb LRU implementation that uses LinkedHashMap.  LuceneTestCase.newSearcher() randomly selects the various implementations.

Needs some proper tests, and probably the concurrency on the LRUCache needs more thought.  And benchmarking! (do our benchmark tests re-use queries at all?) But I thought I'd put this up to see what people think.

> Add a TermContextCache to IndexSearcher
> ---------------------------------------
>
>                 Key: LUCENE-6561
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6561
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Alan Woodward
>         Attachments: LUCENE-6561.patch
>
>
> TermContexts can be quite expensive to build, and if you have fairly complex queries that re-use the same terms you can end up spending a lot of time re-building the same ones over and over again.  It would be nice to be able to cache them on an IndexSearcher, so that they can be re-used.



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