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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2312) Search on IndexWriter's RAM Buffer
Date Wed, 17 Mar 2010 02:29:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846261#action_12846261
] 

Jason Rutherglen commented on LUCENE-2312:
------------------------------------------

I think the easiest way to test out the concurrency is to add a
flush method to ByteBlockPool. Then allocate a read only version
of the buffers array (not copying the byte arrays, just the 1st
dimension pointers). The only issue is to rework the code to
read from the read only array, and write to the write only
array... 

> Search on IndexWriter's RAM Buffer
> ----------------------------------
>
>                 Key: LUCENE-2312
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2312
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Search
>    Affects Versions: 3.0.1
>            Reporter: Jason Rutherglen
>            Assignee: Michael Busch
>             Fix For: 3.1
>
>
> In order to offer user's near realtime search, without incurring
> an indexing performance penalty, we can implement search on
> IndexWriter's RAM buffer. This is the buffer that is filled in
> RAM as documents are indexed. Currently the RAM buffer is
> flushed to the underlying directory (usually disk) before being
> made searchable. 
> Todays Lucene based NRT systems must incur the cost of merging
> segments, which can slow indexing. 
> Michael Busch has good suggestions regarding how to handle deletes using max doc ids.
 
> https://issues.apache.org/jira/browse/LUCENE-2293?focusedCommentId=12841923&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12841923
> The area that isn't fully fleshed out is the terms dictionary,
> which needs to be sorted prior to queries executing. Currently
> IW implements a specialized hash table. Michael B has a
> suggestion here: 
> https://issues.apache.org/jira/browse/LUCENE-2293?focusedCommentId=12841915&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12841915

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