[PATCH] Enable application-level management of IndexWriter.ramDirectory size
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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
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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