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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1313) Realtime Search
Date Wed, 06 May 2009 23:38:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706662#action_12706662
] 

Jason Rutherglen commented on LUCENE-1313:
------------------------------------------

In the patch the merge policies are split up which requires some
of the RAM NRT logic to be in updatePendingMerges. 

One solution is to have a merge policy that manages merging to
ram and to disk, kind of an overarching merge policy for the
primary MP and the RAM MP. This would push the logic of ram
merging and primary dir merging to the meta merge policy which
would clean up IW from managing ram segs vs. prim segs.

Does IW.optimize and IW.expungeDeletes operate on the ramdir as
well (the expungeDeletes javadoc implies calling
IR.numDeletedDocs will return zero when there are no deletes). 

> Realtime Search
> ---------------
>
>                 Key: LUCENE-1313
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1313
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>    Affects Versions: 2.4.1
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1313.jar, LUCENE-1313.patch, LUCENE-1313.patch, LUCENE-1313.patch,
LUCENE-1313.patch, LUCENE-1313.patch, LUCENE-1313.patch, LUCENE-1313.patch, LUCENE-1313.patch,
LUCENE-1313.patch, lucene-1313.patch, lucene-1313.patch, lucene-1313.patch, lucene-1313.patch
>
>
> Realtime search with transactional semantics.  
> Possible future directions:
>   * Optimistic concurrency
>   * Replication
> Encoding each transaction into a set of bytes by writing to a RAMDirectory enables replication.
 It is difficult to replicate using other methods because while the document may easily be
serialized, the analyzer cannot.
> I think this issue can hold realtime benchmarks which include indexing and searching
concurrently.

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