The patterns to transfer requests from the redirector to the worker process are as follows:

• Transfer from one Web server to one worker process
• Transfer from one Web server to multiple worker processes

Note that the mechanism of request distribution is not affected even if the Web server and the worker processes are present on the same machine or on different machines.

The following figures show the patterns to transfer requests from the redirector to the worker process:

Figure 4-1 Transfer from one Web server to one worker process

Figure 4-2 Transfer from one Web server to multiple worker processes

To distribute the requests to multiple Web containers, define the worker processes of multiple Web containers as the distribution destinations, in the redirector registered in the Web server.

The methods to distribute requests with the redirector include:

• Distributing by URL pattern
  Use this method when you want to execute a specific processing in a single Web container, and when you want to distribute a process to multiple Web containers.
  You can use this method when there is one worker process, as well as when there are multiple worker processes.
  
• Distributing in round-robin format with a load balancer
  Use this method when you want to distribute a process to multiple Web containers.
  
• Distributing by the POST data size
  Use this method when you want to distribute a process to multiple Web containers. You can specify this distribution method only when the Web server used is Cosminexus HTTP Server.
  Note that you cannot use this distribution method when the following functionality are used:
  
  • Session failover functionality
  • Distributing requests by the round robin format

To create a worker process, define the following attributes in a file (workers.properties) called the worker definition file:

• Worker name
• Worker type
• Host name or IP address of the Web server on which the worker is running
• Port number received by the worker

The following workers are already defined in a standard workers.properties file. When the Web server and the Web container are operated on the same host, you need not change these parameters.

Worker attributes	Parameter
Worker name	worker1
Worker type	ajp13
Host name	Localhost
Port number	8007

For details on how to define a worker process, see 9.5 workers.properties (Worker definition file) in the uCosminexus Application Server Definition Reference Guide.