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Posted to users@tomcat.apache.org by Mohit Anchlia <mo...@gmail.com> on 2011/01/06 23:58:41 UTC
Simple Question about reading http transmission using mod_jk
We are using mod_jk. My question is when apache receives a request
with http payload does it first read the entire payload and then
transfers it to tomcat or does it just sends the handle to the stream
and then tomcat reads from it. It's little confusing.
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Re: Simple Question about reading http transmission using mod_jk
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Mohit,
On 1/7/2011 2:54 PM, Mohit Anchlia wrote:
> I read through it and based on how I interpret that section is that it
> buffers some data and streams the remaining data if it wasn't
> completely transferred to server and server asks for it (GET_BODY). Am
> I reading it correctly? I know you will correct me :)
I believe the request will be buffered (and stall in mod_jk) until all
headers have been received from the client. After that, all is
streaming, though it might be buffered using ajp_packet_size so mod_jk
always waits for ajp_packet_size bytes (or EOF) before sending to the
backend.
The mod_jk heavy hitters on the list will have to comment.
- -chris
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Re: Simple Question about reading http transmission using mod_jk
Posted by Mohit Anchlia <mo...@gmail.com>.
On Fri, Jan 7, 2011 at 7:22 AM, Christopher Schultz
<ch...@christopherschultz.net> wrote:
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> Chuck,
>
> On 1/6/2011 6:01 PM, Caldarale, Charles R wrote:
>>> From: Mohit Anchlia [mailto:mohitanchlia@gmail.com]
>>> Subject: Simple Question about reading http transmission using mod_jk
>>
>>> does it just sends the handle to the stream and then tomcat
>>> reads from it. It's little confusing.
>>
>> Think about it: the connection between httpd and Tomcat is a comm
>> link; how could httpd give Tomcat a handle when Tomcat may well be
>> running on a completely different system?
>
> There's a legitimate questions hidden in this one: does mod_jk work on a
> streaming model or a buffering model?
>
> To answer /that/ question, one need only read
> http://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html in the section
> "overview of the protocol" (hint to the OP).
>
I read through it and based on how I interpret that section is that it
buffers some data and streams the remaining data if it wasn't
completely transferred to server and server asks for it (GET_BODY). Am
I reading it correctly? I know you will correct me :)
> If the client (mod_jk) and the server (Tomcat) are on the same machine
> (localhost), then any respectable TCP/IP stack significantly optimizes
> such communication by playing wonderful shared memory tricks that
> increase performance significantly.
>
> - -chris
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> =TTvI
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Re: Simple Question about reading http transmission using mod_jk
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Chuck,
On 1/6/2011 6:01 PM, Caldarale, Charles R wrote:
>> From: Mohit Anchlia [mailto:mohitanchlia@gmail.com]
>> Subject: Simple Question about reading http transmission using mod_jk
>
>> does it just sends the handle to the stream and then tomcat
>> reads from it. It's little confusing.
>
> Think about it: the connection between httpd and Tomcat is a comm
> link; how could httpd give Tomcat a handle when Tomcat may well be
> running on a completely different system?
There's a legitimate questions hidden in this one: does mod_jk work on a
streaming model or a buffering model?
To answer /that/ question, one need only read
http://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html in the section
"overview of the protocol" (hint to the OP).
If the client (mod_jk) and the server (Tomcat) are on the same machine
(localhost), then any respectable TCP/IP stack significantly optimizes
such communication by playing wonderful shared memory tricks that
increase performance significantly.
- -chris
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=TTvI
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RE: Simple Question about reading http transmission using mod_jk
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Mohit Anchlia [mailto:mohitanchlia@gmail.com]
> Subject: Simple Question about reading http transmission using mod_jk
> does it just sends the handle to the stream and then tomcat
> reads from it. It's little confusing.
Think about it: the connection between httpd and Tomcat is a comm link; how could httpd give Tomcat a handle when Tomcat may well be running on a completely different system?
- Chuck
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