xmlui BitstreamReader holds database connections open while large files
download, exhausting connection pool
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Key: DS-677
URL: http://jira.dspace.org/jira/browse/DS-677
Project: DSpace 1.x
Issue Type: Bug
Components: XMLUI
Affects Versions: 1.6.2, 1.6.1, 1.6.0, 1.5.2, 1.5.1, 1.5.0
Reporter: Keith Gilbertson
Attachments: bitstreamreader_closedb.patch.txt
The BitstreamReader in the xmlui needs a database connection to locate
Bitstreams in the assetstore before sending them back to the client's browser.
The database connection seems to be held open until the file is sent
completely. This can cause problems on systems with many users, especially
where the bitstreams are very large, as with video files. Users will see an
error when the application is unable to successfully get a connection from the
database pool.
A patch is attached that forces the database connection closed by calling
context.complete() early. Fix has worked very successfully in 1.5.x under
heavy usage. It has only been tested lightly in DSpace 1.6.x. I'd like to
commit this for a fix in 1.7, but am unsure:
- Does this patch violate some part of the DSpace architecture by closing
the db connection in the wrong place?
- Could JSPUI have a similar problem? Is anyone aware of a technique for
automatically finding this sort of issue?
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