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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1313) Realtime Search
Date Mon, 01 Jun 2009 00:53:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714948#action_12714948
] 

Michael McCandless commented on LUCENE-1313:
--------------------------------------------

{quote} 
I want to run the Lucene unit tests in NRT mode without creating and/or 
modifying all the test cases. 
{quote} 
You can just temporarily set the default then run all tests? 

We never reached consensus on a back compat sort of setting... 

{quote} 
I ran a test case successfully that writes to a file while 
opening threads that read from flushed sections on windows. 
{quote} 

Excellent; let's take this up under a new issue? If this holds true across platform (and Windows
is the most challenging one) then it'll make sharing much easier. 

{quote} 
Closing docstores for every flush would seem to cause a lot of 
overhead. With NRT + FSD aren't termvector files merged on disk for 
every segment? 
{quote} 

Yes it adds overhead, though, it's not on the critical path for opening a new reader since
it happens in the BG. So... things like LUCENE-1526 (making deletions, norms incrementally
copy-on-write) I think are higher priority. 

bq. Doesn't FSDir open only one FD per file? 

No, it opens a real file every time openInput is called. I guess we could think about having
it share/clone internally?

> 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,
lucene-1313.patch, lucene-1313.patch
>
>
> Enable near realtime search in Lucene without external
> dependencies. When RAM NRT is enabled, the implementation adds a
> RAMDirectory to IndexWriter. Flushes go to the ramdir unless
> there is no available space. Merges are completed in the ram
> dir until there is no more available ram. 
> IW.optimize and IW.commit flush the ramdir to the primary
> directory, all other operations try to keep segments in ram
> until there is no more space.

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