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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 48738] New: GzipOutputFilter blocking data to the client browser when flushBuffer is invoked
Date Sat, 13 Feb 2010 23:28:28 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=48738

           Summary: GzipOutputFilter blocking data to the client browser
                    when flushBuffer is invoked
           Product: Tomcat 6
           Version: 6.0.20
          Platform: All
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: major
          Priority: P2
         Component: Connectors
        AssignedTo: dev@tomcat.apache.org
        ReportedBy: jiwang@linkedin.com


Created an attachment (id=24979)
 --> (https://issues.apache.org/bugzilla/attachment.cgi?id=24979)
patch for the making GzipOutputFilter work with early flush

As part of our site speed optimizations (at Linkedin) we bumped into a problem
when trying to do partial flush of compressed content stream from Tomcat to the
browser. We discovered the root cause to be a couple of long outstanding JDK
bugs:

 http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4255743
 http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4813885

Basically, with the GzipOutputFilter turned on, the GZIPOutputStream it uses
internally buffers the data that's been sent over, and does not flush to client
(browser) when flushBuffer() is invoked.

We have produced a patch which we verified internally, that it did work to do a
partial flush on the compressed stream. We also have a unit testcase included
in the patch to quickly show the problem. 

Early flush is a quite useful technique that many sites out there can benefit
from to speed up the page download/rendering time, and by having it working in
tomcat would benefit the existing and new customers. 

Thanks!

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