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List:       apache-httpd-bugs
Subject:    DO NOT REPLY [Bug 39442]  New:  - More usage of network bandwidth with Apache Proxy Server
From:       bugzilla () apache ! org
Date:       2006-04-28 6:11:02
Message-ID: bug-39442-7868 () http ! issues ! apache ! org/bugzilla/
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http://issues.apache.org/bugzilla/show_bug.cgi?id=39442

           Summary: More usage of network bandwidth with Apache Proxy Server
           Product: Apache httpd-2
           Version: 2.0.50
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: All
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: saleem@cordys.com
                CC: saleem@cordys.com


Hi,

We have been using Apache Proxy Server and we have noticed some strange 
bahavior w.r.t network usage.

The network usage of Apache Proxy server and the client machine which is 
connected to it are being monitored. A download 
(http://ftp.surfnet.nl/ftp/pub/os/Linux/distr/fedora/1/i386/iso/) have been 
initiated from the client machine. Before the download gets completed, it is 
cancelled from the client.

It is noticed that the network usage of Apache Proxy Server is still high, 
even if the download gets cancelled and it remains high for considerable time( 
the time equivalent for the entire download to complete). 

What are the reasons for this behavior?

To ascertain the fact that Proxy server still process the download, when it is 
cancelled from client, we did few more tests with only one client connected to 
Apache Proxy. 

1. Download initiated from client, cancelled it after 20 minutes. The after 20 
minutes, the Apache Proxy Server is stopped.

It is noticed that as soon as download is initiated, the network bandwidth 
usage (transmit bps ) by Apache Proxy Server goes high ( almost 0.8 Mbps ). 
When the download is cancelled from client, the transmit bps of Apache proxy 
serve remains same. 

Only when Apache is stopped, the transmit bps comes down (obvious). In one of 
the tests, Apache was not stopped, and monitored the transmit bps, which has 
remained high for the time equivalent to complete download time.

2. Two proxy servers were used in the second test, where the client is 
connected to first Apche Proxy Server, which is connected to Second Proxy 
Server.

The download is initiated from client, cancelled it from client, then First 
Apache Proxy Server is stopped and Finally Second Apache Proxy Server is 
stopped.

When the download is cancelled, the transmit bps of both the First Apache 
Proxy and Second Apache Proxy remains high. Even if the First Proxy Server is 
stopped, the transmit bps of Second Proxy Server remains high.


We would like to know why is such behavior being exhibited by Apache Proxy. 

In case, more information is required, I can send more details.


Thanks and Regards,
Saleem.

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