mod_proxy_balancer not balancing equally

[Vamsee Lakamsani <vamsee@xxxxxxxxxxxxxxxxxxxxx>]

Hi,

We are using mod_proxy_balancer (mod_lbmethod_byrequests) with Apache httpd 2.4 on   Amazon Linux 4.4.41-35.53.amzn1.x86_64 (2016.09). 

We are using the docs from here:

mod_proxy_balancer - Apache HTTP Server Version 2.4

mod_proxy_balancer - Apache HTTP Server Version 2.4

Here is our balancer setup:

ProxyHCExpr ok234 {%{REQUEST_STATUS} =~ /^[234]/}
Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/" env=BALANCER_ROUTE_CHANGED
<Proxy "balancer://mainBalancer">
  BalancerMember "http://api1:3000"  route=1  loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  BalancerMember "http://api2:3000"  route=2  loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  BalancerMember "http://api3:3000"  route=3  loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  BalancerMember "http://api4:3000"  route=4  loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  BalancerMember "http://api5:3000"  route=5  loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  BalancerMember "http://api6:3000"  route=6  loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  BalancerMember "http://api7:3000"  route=7  loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  BalancerMember "http://api8:3000"  route=8  loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  BalancerMember "http://api9:3000"  route=9  loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  BalancerMember "http://api10:3000" route=10 loadfactor=1 hcmethod=GET hcuri=/onkore/api/v1/time hcexpr=ok234 hcinterval=10 hcpasses=2 hcfails=3
  ProxySet lbmethod=byrequests stickysession=ROUTEID nofailover=Off
</Proxy>

We are seeing (as measure by New Relic our monitoring service) that http request are not being distributed equally. The first server (api1) is getting more than the second one and so on with the last one getting the least amount of request. Attached is a screen shot that shows this. 

We would appreciate any feedback on what is causing this and how to fix.  A related question is on the health checks. Is there any way to avoid copy/pasting the health check info on all the member lines?

Vamsee Lakamsani

Attachment: VMS-RPMs.png
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