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From "Andrzej Bialecki (JIRA)" <>
Subject [jira] Commented: (LUCENE-2453) Make Index Output Buffer Size Configurable
Date Sun, 04 Jul 2010 20:54:49 GMT


Andrzej Bialecki  commented on LUCENE-2453:

Karthick, I'm interested in moving forward with this and LUCENE-2456. Could you perhaps prepare
an updated patch that incorporates the comments above?

> Make Index Output Buffer Size Configurable
> ------------------------------------------
>                 Key: LUCENE-2453
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Store
>    Affects Versions: 3.0.1
>            Reporter: Karthick Sankarachary
>         Attachments: LUCENE-2453.patch
> Currently, the buffered index input class allows sub-classes and users thereof to specify
a size for the input buffer, which by default is 1024 bytes. In practice, this option is leveraged
by the simple file and compound segment index input sub-classes. 
> By the same token, it would be nice if the buffered index output class could open up
it's buffer size for users to configure. In particular, this would allow sub-classes thereof
to align the output buffer size, which by default is 16348 bytes, to that of the underlying
directory's data unit. For example, a network-based directory might want to buffer data in
multiples of it's maximum transmission unit. To use an existing use-case, the file system-based
directory could potentially choose to align it's output buffer size to the operating system's
file block size.
> The proposed change to the buffered index output class involves defining a one-arg constructor
that takes a user-defined buffer size, and a default constructor that uses the currently defined
buffer size.

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