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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 36895] New: - get_most_suitable_worker is called twice for a single request
Date Mon, 03 Oct 2005 12:33:13 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=36895

           Summary: get_most_suitable_worker  is called twice for a single
                    request
           Product: Tomcat 5
           Version: 5.0.28
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Native:JK
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: bibin.abraham@cognizant.com


The function get_most_suitable_worker in jk_lb_worker.c is called twice for each
request. jk_handler selects the worker returned from the first called function .
So loadbalancing is not perfect. ( in mod_jk version 1.2.14 ) 

 Consider we have two loadbalancer workers tomcat1 and tomcat2 . 

  request1 --> jk_handler <-- tomcat1 ( returned from get_most_suitable_worker) 
                          <-- tomcat2 ( returned from get_most_suitable_worker) 

  request2 --> jk_handler <-- tomcat1 ( returned from get_most_suitable_worker) 
                          <-- tomcat2 ( returned from get_most_suitable_worker)
  
   Here jk_handler always selects tomcat1.

  If we have 3 loadbalancer workers, the sequence will be like this....

   request1 --> jk_handler <-- tomcat1   
                           <-- tomcat2  

   request2 --> jk_handler <-- tomcat3   
                           <-- tomcat1 

   request3 --> jk_handler <-- tomcat2   
                           <-- tomcat3

  Here the loadbalancing sequence will be ... tomcat1,tomcat3,tomcat2,tomcat1.....

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