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From 青柳 隆 <svu00...@partner.nri.co.jp>
Subject [users@httpd] A problem of failover of mod_proxy_balancer
Date Wed, 17 Oct 2007 13:20:36 GMT
Hello,

I used mod_proxy_balancer and tested failover. 

The composition is as follows.
----------------------------------------
OS: CentOS 4.4
Java: jdk_1.5.0_11-b03
----------------------------------------
Apache(2.2.6) --+-- JBoss EAP(4.2.0)
                |
                +-- JBoss EAP(4.2.0)
----------------------------------------

----------------------------------------------------------------
mod_proxy_balancer setting
----------------------------------------------------------------
ProxyPass /lb/ balancer://lb/ timeout=5 maxattempts=3

<Proxy balancer://lb/>
  BalancerMember ajp://ap1:8009/lb/ min=1 keepalive=on retry=300
  BalancerMember ajp://ap2:8009/lb/ min=1 keepalive=on retry=300
</Proxy>
----------------------------------------------------------------

When abnormality occurs to a backend server of one side 
while it takes load in a lot of threads,
mod_proxy_balancer does not perform failover normally. 
Requests continue being performed by the backend server 
which there is abnormality.
On account of this, throughput extremely turns worse.

When the backend server of the one side is not switched on or 
when I pulled the LAN cable of the backend server of the one side, 
this phenomenon occurs.

This phenomenon does not occur even if it takes high load 
when I stopped a JAVA process of JBoss. 
Failover is performed normally.

Will this be a bug?


------------------------------------------
Takashi Aoyagi
E-mail: svu00012@partner.nri.co.jp
------------------------------------------


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