Using acceptCount in server.xml

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Using acceptCount in server.xml

Using acceptCount in server.xml

2004-01-09 - By Donie Kelly

Back

Reply: 1 2

Hi all

Just wondering how to use acceptCount in the Connector class. Default
example here modified to show what I'm trying to test to understand how this
works.

<Connector className="org.apache.coyote.tomcat4.CoyoteConnector

Source code of org.apache.coyote.tomcat4.CoyoteConnector

"
port="8443" minProcessors="1" maxProcessors="1"
enableLookups="true" acceptCount="2" debug="0"
scheme="https" secure="true"
useURIValidationHack="false" disableUploadTimeout="true">
<Factory
className="org.apache.coyote.tomcat4.CoyoteServerSocketFactory

Source code of org.apache.coyote.tomcat4.CoyoteServerSocketFactory

"
clientAuth="false" protocol="TLS" />
</Connector>

I start Tomcat with this setup and see that it has only one object in it's
connection pool as expected.

I have a small servlet that just returns a number (incrementing) and has a
forced pause to simulate work being done. 2 seconds wait.

1. I send the request with Browser 1 to the servlet and it doesn't
return yet. Should be asleep for 2 seconds
2. I send the request with Browser 2 to the servlet and it does noting
but looks like it's busy as expected as maxProcessors=1 above
3. Browser 1 now returns with it's incrementing number
4. Now I expect browser 2 to be assigned to the free connection in
Tomcat's pool but nothing happens... ever.
5. Browser 1 goes again and works after 2 seconds.

Q: Why did browser 2 not get assigned the servlet that browser 1 freed up
when it finished the request

Q: Does the acceptCount does what I think it does?

Thanks for any help in understanding how this works.
Donie

<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft
-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:dt=
"uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns="http://www.w3.org/TR/REC
-html40">

<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859 (See http://iso-8859.ora-code.com)-1">

<meta name="Microsoft Theme 2.00" content="capsules 001">

<meta name=ProgId content=Word.Document>
<meta name=Generator content="Microsoft Word 9">
<meta name=Originator content="Microsoft Word 9">
<link rel=File-List href="cid:filelist.xml@(protected)">

<style>

</style>

</head>

<body bgcolor=white background="cid:image001.gif@(protected)" lang=EN-GB
link="#000099" vlink="#339966" style='tab-interval:36.0pt'>
<img src="cid:image001.gif@(protected)"
v:src="cid:image001.gif@(protected)" v:shapes="_x0000_Mail" width=0
height=0 class=shape style='display:none;width:0;height:0'>

<div class=Section1>

Hi all<o:p>
</o:p>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

Just
wondering how to use acceptCount in the Connector class. Default example here
modified to show what I’m trying to test to understand how this works.<o
:p></o:p>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

&lt
;Connector
className="org.apache.coyote.tomcat4.CoyoteConnector

"  port="8443"
minProcessors="1" maxProcessors="1"<o:p></o:p>

            
  
enableLookups="true" 
acceptCount="2" debug="0" scheme="https"
secure="true"<o:p></o:p>

            
  
useURIValidationHack="false"
disableUploadTimeout="true"><o:p></o:p>

      <Factory
className="org.apache.coyote.tomcat4.CoyoteServerSocketFactory

"
clientAuth="false" protocol="TLS" /><o:p></o:p>

    </Connector><o:p></o
:p>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

I start
Tomcat with this setup and see that it has only one object in it’s
connection pool
as expected.<o:p></o:p>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

I have a
small servlet that just returns a number (incrementing) and has a forced pause
to simulate work being done. 2 seconds wait.<o:p></o:p>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

<ol style='mso-margin-top-alt:0cm' start=1 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'>I send the request with
Browser 1 to the servlet and it doesn’t return yet. Should be asleep
for 2
seconds<o:p></o:p></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'>I send the request with
Browser 2 to the servlet and it does noting but looks like it’s busy
as
expected as maxProcessors=1 above<o:p></o:p></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'>Browser 1 now returns
with it’s incrementing number<o:p></o:p></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'>Now I expect browser 2
to be assigned to the free connection in Tomcat’s pool but nothing
happens…
ever.<o:p></o:p></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'>Browser 1 goes again and
works after 2 seconds.<o:p></o:p></li>
</ol>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

Q: Why did
browser 2 not get assigned the servlet that browser 1 freed up when it finished
the request<o:p></o:p>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

Q: Does the
acceptCount does what I think it does?<o:p></o:p>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

Thanks for
any help in understanding how this works.<o:p></o:p>

Donie<o:p><
/o:p>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

</div>

</body>

</html>

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