[Bug 56261] New: Load balancing method bybusiness not working properly

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=56261

            Bug ID: 56261
           Summary: Load balancing method bybusiness not working properly
           Product: Apache httpd-2
           Version: 2.2.21
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_proxy_balancer
          Assignee: bugs@httpd.apache.org
          Reporter: enrico.bonato@omnitechweb.it

We have set up this conifguration on an HTTPD reverse proxy:

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so

Header add Set-Cookie "APACHE_ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/"
env=BALANCER_ROUTE_CHANGED
<Proxy balancer://AppCluster>
  BalancerMember https://node1.service.int route=1
  BalancerMember https://node2.service.int route=2
  BalancerMember https://node3.service.int route=3
  BalancerMember https://node4.service.int route=4
  ProxySet stickysession=APACHE_ROUTEID
  ProxySet lbmethod=bybusyness
</Proxy>

We expect requests to be balanced equally across all nodes; but the first node
is overloaded
Here is the output of the balancer-manager

StickySession    Timeout    FailoverAttempts    Method
APACHE_ROUTEID    0    3     bybusyness

Worker URL    Route    RouteRedir    Factor    Set    Status    Elected    To  
 From
https://node1.service.int    1        1    0    Ok    2380166    3.5G    892M
https://node2.service.int    2        1    0    Ok    203860    292M    78M
https://node3.service.int    3        1    0    Ok    203250    294M    79M
https://node4.service.int    4        1    0    Ok    351205    511M    132M


There is only one kind of request made, always of the same dimension

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[Bug 56261] Load balancing method bybusiness not working properly

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=56261

--- Comment #1 from Eric Garreau <eg...@gmail.com> ---
hello

by-business is supposed to compare current input FIFO lengths of the balancer
members prior to select the best choice for new sessions

it means that the distribution is likely to be "strange" in different
use-cases:
 - your nodes may not be busy enough, meaning that the first one looks cool
 - your four nodes may have hidden extra load due to other internal tasks
 - requests processing of your business traffic might be "short" and "long",
    regardless of the real data size (by-business looks for queue lengths)
 - long-life sessions go where the sticky cookie says, and thus the first node
    may have to assume traffic which has been chosen in an unloaded state

are you able to gather the input FIFO size of your backend nodes and monitor
that their input invocations are balanced ?

(FYI, I'm not a developer of mod_security_balancer but I already had to
understand the same kind of pseudo-issue in the past)

try to compare how your backend nodes behave when you use the by-request policy
(the console should look normal, but you might get different CPU loads on the
nodes ?)

I hope this helps,
eric

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[Bug 56261] Load balancing method bybusiness not working properly

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=56261

Enrico Bonato <en...@omnitechweb.it> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Enrico Bonato <en...@omnitechweb.it> ---
Eric, thank you for the response. 

BTW, apply the byrequest method solved our issue; I can say it was just our
lack of understanding about the bybusiness behaviour

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