[jira] Resolved: (LUCENE-1339) Add IndexReader.acquire() and release() methods using IndexReader's ref counting

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

     [ https://issues.apache.org/jira/browse/LUCENE-1339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless resolved LUCENE-1339.
----------------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 2.3.2)
                   2.4
    Lucene Fields: [New, Patch Available]  (was: [Patch Available, New])

Thanks Andi!

> Add IndexReader.acquire() and release() methods using IndexReader's ref counting
> --------------------------------------------------------------------------------
>
>                 Key: LUCENE-1339
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1339
>             Project: Lucene - Java
>          Issue Type: New Feature
>            Reporter: Andi Vajda
>            Assignee: Michael McCandless
>             Fix For: 2.4
>
>         Attachments: lucene-1339.patch
>
>
> From: http://mail-archives.apache.org/mod_mbox/lucene-java-dev/200807.mbox/%3cPine.OSX.4.64.0807170752080.1708@c5850-a3-2-62-147-22-102.dial.proxad.net%3e
> I have a server where a bunch of threads are handling search requests. I
> have a another process that updates the index used by the search server and
> that asks the searcher server to reopen its index reader after the updates
> completed.
> When I reopen() the index reader, I also close the old one (if the reopen()
> yielded a new instance). This causes problems for the other threads that
> are currently in the middle of a search request.
> I'd like to propose the addition of two methods, acquire() and release() 
> (attached to this bug report), that increment/decrement the ref count that IndexReader 
> instances currently maintain for related purposes. That ref count prevents 
> the index reader from being actually closed until it reaches zero.
> My server's search threads, thus acquiring and releasing the index reader 
> can be sure that the index reader they're currently using is good until 
> they're done with the current request, ie, until they release() it.

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