DO NOT REPLY [Bug 37245] New: - Slow host in load balancer under heavy load issue

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http://issues.apache.org/bugzilla/show_bug.cgi?id=37245

           Summary: Slow host in load balancer under heavy load issue
           Product: Tomcat 5
           Version: Unknown
          Platform: Other
               URL: http://algesten.blogspot.com/
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Native:JK
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: puckman@taglab.com
 BugsThisDependsOn: 36138


We have 1 web server dispatching requests to 4 application servers.

2 of these servers are older/slower/under more load from other sites being hosted.

When having a heavy load, we've observed that initially the busy queues of the workers are longer on 
the older hosts, which seems logical. However gradually increasing the load can reach a tipping point, 
where the older hosts can't get through the load quickly enough, making the queues grow and grow 
until tomcat stalls. This is happening at the same time as the two newer hosts are holding up fine and 
could take more load

An election algorithm that takes the busy queue into account would solve the problem. One such 
algorithm has been submitted in #36138.

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