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From "Eks Dev (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2691) Consolidate Near Real Time and Reopen API semantics
Date Thu, 25 Nov 2010 14:45:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935772#action_12935772
] 

Eks Dev commented on LUCENE-2691:
---------------------------------

strictly speaking not really this issue, but somehow fits into discussion about  IR.reopen()
semantics.

What would be the best way to support the following case? (Imo, very often needed. )


Directory d = FSDirectory.open("/path/to/somewhere"); // Nice
d_ram = RAMDirectory(d); 
r_ram = IndexReader.open(d_ram);  
r_ram.reload(); //Here we want to reload from the  FSDirecotory?

Point being, reload need not only IR/IW semantics consideration, but Directory as well.

Does this make sense?
A solution that looks doable would be to have "DiskBoundRAMDirectory extends RAMDirectory",
that would remain read-only and keep a reference to FSDirectory (or whatewer Directory). 
What is missing is a "signal" from IR.reload() to RAMdirectory to slurp fresh information
from FSDirecory? 


 


> Consolidate Near Real Time and Reopen API semantics
> ---------------------------------------------------
>
>                 Key: LUCENE-2691
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2691
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-2691.patch, LUCENE-2691.patch
>
>
> We should consolidate the IndexWriter.getReader and the IndexReader.reopen semantics,
since most people are already using the IR.reopen() method, we should simply add::
> {code}
> IR.reopen(IndexWriter)
> {code}
> Initially, it could just call the IW.getReader(), but it probably should switch to just
using package private methods for sharing the internals

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