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From "Michael McCandless (Updated) (JIRA)" <>
Subject [jira] [Updated] (LUCENE-3486) Add SearcherLifetimeManager, so you can retrieve the same searcher you previously used
Date Tue, 04 Oct 2011 21:30:35 GMT


Michael McCandless updated LUCENE-3486:

    Attachment: LUCENE-3486.patch

Patch w/ Shai's suggestions, and tweaked some jdocs.
> Add SearcherLifetimeManager, so you can retrieve the same searcher you previously used
> --------------------------------------------------------------------------------------
>                 Key: LUCENE-3486
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: core/search
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 3.5, 4.0
>         Attachments: LUCENE-3486.patch, LUCENE-3486.patch
> The idea is similar to SOLR-2809 (adding searcher leases to Solr).
> This utility class sits above whatever your source is for "the
> current" searcher (eg NRTManager, SearcherManager, etc.), and records
> (holds a reference to) each searcher in recent history.
> The idea is to ensure that when a user does a follow-on action (clicks
> next page, drills down/up), or when two or more searcher invocations
> within a single user search need to happen against the same searcher
> (eg in distributed search), you can retrieve the same searcher you
> used "last time".
> I think with the new searchAfter API (LUCENE-2215), doing follow-on
> searches on the same searcher is more important, since the "bottom"
> (score/docID) held for that API can easily shift when a new searcher
> is opened.
> When you do a "new" search, you record the searcher you used with the
> manager, and it returns to you a long token (currently just the
> IR.getVersion()), which you can later use to retrieve the same
> searcher.
> Separately you must periodically call prune(), to prune the old
> searchers, ideally from the same thread / at the same time that
> you open a new searcher.

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