[ http://issues.apache.org/jira/browse/LUCENE-709?page=all ]
Chuck Williams updated LUCENE-709:
----------------------------------
Attachment: ramDirSizeManagement.patch
> [PATCH] Enable application-level management of IndexWriter.ramDirectory size
> ----------------------------------------------------------------------------
>
> Key: LUCENE-709
> URL: http://issues.apache.org/jira/browse/LUCENE-709
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.0.1
> Environment: All
> Reporter: Chuck Williams
> Attachments: ramDirSizeManagement.patch
>
>
> IndexWriter currently only supports bounding of in the in-memory index cache
> using maxBufferedDocs, which limits it to a fixed number of documents. When
> document sizes vary substantially, especially when documents cannot be
> truncated, this leads either to inefficiencies from a too-small value or
> OutOfMemoryErrors from a too large value.
> This simple patch exposes IndexWriter.flushRamSegments(), and provides access
> to size information about IndexWriter.ramDirectory so that an application can
> manage this based on total number of bytes consumed by the in-memory cache,
> thereby allow a larger number of smaller documents or a smaller number of
> larger documents. This can lead to much better performance while elimianting
> the possibility of OutOfMemoryErrors.
> The actual job of managing to a size constraint, or any other constraint, is
> left up the applicatation.
> The addition of synchronized to flushRamSegments() is only for safety of an
> external call. It has no significant effect on internal calls since they all
> come from a sychronized caller.
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