[jira] Created: (JCR-2173) Inefficient spooling from File DataStore to Webdav servlet response

["Greg Schueler (JIRA)" <ji...@apache.org>]

Inefficient spooling from File DataStore to Webdav servlet response
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                 Key: JCR-2173
                 URL: https://issues.apache.org/jira/browse/JCR-2173
             Project: Jackrabbit Content Repository
          Issue Type: Improvement
          Components: jackrabbit-webdav
    Affects Versions: 1.5.6
         Environment: Jetty 6.1.14 server
            Reporter: Greg Schueler


When downloading large files (200MB+) via webdav, there is a long delay in the request prior to the first response happening.

I think the problem is that the webdav servlet is first copying the file out of the datastore into a temporary file, and then using that temporary file as the source for streaming the response to the client.

1. The DefaultHandler IOHandler spools the data from the content Node to the ExportContext's output stream
2. The ExportContext simply uses a temporary file to write the data to
3. Once written to a temp file the ExportContext then spools the content of the file to the OutputContext's output stream (the HTTP response).

So in the case of a large file, the entire content must be written to a temp file before any data is sent to the HTTP response, taking up both extra time for both parties, and disk space on the server.

When using the File DataStore, the content is already in a file, and should simply be spooled to the HTTP response

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