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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-475) RAMDirectory(Directory dir, boolean closeDir) constructor uses memory inefficiently.
Date Thu, 01 Dec 2005 23:31:31 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-475?page=comments#action_12359098 ] 

Doug Cutting commented on LUCENE-475:
-------------------------------------

Why not just use BufferedIndexOutput.BUFFER_SIZE, a constant declared elsewhere and already
used for all RAMDirectory buffers?  That way you're not introducing any new constants and
disturbing the constant averse...

And I disagree that the default behaviour should be as before:  there's no good reason to
buffer the entire file.  That was a bug that this patch fixes.

>  RAMDirectory(Directory dir, boolean closeDir)  constructor uses memory inefficiently.
> --------------------------------------------------------------------------------------
>
>          Key: LUCENE-475
>          URL: http://issues.apache.org/jira/browse/LUCENE-475
>      Project: Lucene - Java
>         Type: Improvement
>   Components: Store
>     Reporter: Volodymyr Bychkoviak
>  Attachments: RamDirectory.diff
>
> recently I found that  RAMDirectory(Directory dir, boolean closeDir)  constructor uses
memory inefficiently.
> files from source index are read entirely intro memory as single byte array which is
after all is thrown away. And if I want to load my 200M optimized, compound format index to
memory for faster search I should give JVM at least 400Mb memory limit. For larger indexes
this can be an issue.
> I've attached patch how to solve this problem.

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