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https://issues.apache.org/jira/browse/LUCENE-2453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865688#action_12865688
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Shai Erera commented on LUCENE-2453:
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Patch looks good ! Few comments:
* buffer can still be final (and should) since it's only initialized in the ctor
* I'd inline checkBufferSize in the ctor
* I think that adding the same level of control to BufferedIndexInput would be
useful too?
In general, I think the size of the buffer (1024) is set like that because
larger buffer sizes did not improve the performance. Can you perhaps run on the
benchmark indexing algorithms, w/ the buffer size set to larger values and
report the results? It'd be interesting to note if there are any improvements
before we open up the API like that.
> Make Index Output Buffer Size Configurable
> ------------------------------------------
>
> Key: LUCENE-2453
> URL: https://issues.apache.org/jira/browse/LUCENE-2453
> 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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