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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 37245] New: - Slow host in load balancer under heavy load issue
Date Wed, 26 Oct 2005 06:09:53 GMT
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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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