Re: How can i configure tomcat to avoid threads error in tomcat

Tue, 19 Jun 2007 08:05:03 -0700 

Prashant,

Unless I'm load-testing, the only time I've seen thread counts that
high is when something is wrong with the app, and it's usually a
database connection that hasn't been closed.  Check the number of
database connections in use out of the pool (this is typically
something that you'd do on the database server itself; I don't know of
any mechanism in Tomcat to get that measurement).  If that is also an
extraordinarily large number, then you might consider checking for
database connections that haven't been closed.  For typical sites, you
really don't usually need a database connection pool any larger than a
few tens of connections.

What happens is that the database connection pool (or the database
server itself) exhausts its supply of connections, and new requests
that come in to Tomcat queue until more connections come open or the
connection requests time out.

Good luck.

B.



Prashant Thakkar wrote:

Hi,

Thanks,
But this is the clients application which we are running. We dont have the access to the servlet code. That was the the obvious reason we had increased 
the thread limit to 250.
Other thing i would like to know is about the thread pooling. How can i use 
this with tomcat 5.0.28
Below is the connector which we are using:

<!-- Define a non-SSL Coyote HTTP/1.1 Connector on port 8080 -->
<Connector port="8080"
      maxThreads="250" minSpareThreads="25" maxSpareThreads="75"
      enableLookups="false" redirectPort="8443" acceptCount="100"
      debug="0" connectionTimeout="0"
      disableUploadTimeout="true" />
<!-- Note : To disable connection timeouts, set connectionTimeout value
to 0 -->
<!-- Note : To use gzip compression you could set the following properties : 

    compression="on"
    compressionMinSize="2048"
    noCompressionUserAgents="gozilla, traviata"
    compressableMimeType="text/html,text/xml"
-->

<!-- Define a SSL Coyote HTTP/1.1 Connector on port 8443 -->
<!--
<Connector port="8443"
      maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
      enableLookups="false" disableUploadTimeout="true"
      acceptCount="100" debug="0" scheme="https" secure="true"
      clientAuth="false" sslProtocol="TLS" />
-->

<!-- Define a Coyote/JK2 AJP 1.3 Connector on port 8009 -->
<Connector port="8009"
      enableLookups="false" redirectPort="8443" debug="0"
      protocol="AJP/1.3" />

<!-- Define a Proxied HTTP/1.1 Connector on port 8082 -->
<!-- See proxy documentation for more information about using this. -->
<!--
<Connector port="8082"
      maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
      enableLookups="false"
      acceptCount="100" debug="0" connectionTimeout="20000"
      proxyPort="80" disableUploadTimeout="true" />
-->

Thanks and Regards,
- Prashant Thakkar

On 6/19/07, Robert Harper <[EMAIL PROTECTED]> wrote:


Do as it says and increase the max threads parameter or manage your
threads
better.

Robert S. Harper
Senior Engineer
Information Access Technology, Inc.
1100 East 6600 South, Suite 300
Salt Lake City Utah USA 84121-7411
(801)265-8800 Ext. 255
FAX (801)265-8880


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-----Original Message-----
From: Prashant Thakkar [mailto:[EMAIL PROTECTED]
Sent: Tuesday, June 19, 2007 7:25 AM
To: users@tomcat.apache.org
Subject: How can i configure tomcat to avoid threads error in tomcat

Hi All,

I am frequently getting this error in tomcat which stops my tomcat
service.
Pl help me its urgent and costing my service as well:

I am getting bellow error in my catalina logs:
Jun 19, 2007 5:55:44 PM org.apache.tomcat.util.threads.ThreadPool logFull SEVERE: All threads (250) are currently busy, waiting. Increase maxThreads 
(250) or check the servlet status
Thanks in advance
- Prashant Thakkar



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