[ http://issues.apache.org/jira/browse/LUCENE-709?page=comments#action_12450791 ] Yonik Seeley commented on LUCENE-709: -------------------------------------
A couple of points: - synchronizing the hashTable doesn't help solve the outlined scenario above since the logic that first adds merged segments and removes old segments doesn't synchronize on the hashTable. This is another case that requires synchronization at a higher level. - for the specific case of the buffered docs in the IndexWriter, they are not merged to the same RAMDirectory anyway. > [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, 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. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
