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From Mauro Vanetti <ma...@funambol.com>
Subject Re: [users@httpd] Load balancing: nothing gets logged for a few seconds when a machine is rebooted
Date Wed, 12 May 2010 14:00:55 GMT
Hi Mark,
  forgive me, I'm afraid I'm not using the right terminology for lack of 
experience with Apache. I was talking about the JK (Apache-Tomcat) 
connector.
You are right about ping, too. It was not an actual ping but a full HTTP 
request performed with wget.
Thanks.

On 12/05/2010 15.48, Mark Watts:
> On Wed, 2010-05-12 at 13:00 +0200, Mauro Vanetti wrote:
>> Hello!
>> I'm testing load balancing between four nodes placed in two distinct
>> machines (2 + 2). The load balancer is on the first machine, where nodes
>> 11 and 12 are. Nodes 21 and 22 are on the second machine.
>> When I reboot the second machine, the load balancer detects the error
>> and redirects all new requests to nodes 11 and 12 only, until the nodes
>> on the second machine are up again.
>> This is all very good, the only problem is what happens in the critical
>> seconds. Clearly, a few sessions will fail (those already started but
>> not yet finished on nodes 21 and 22 when the second machine is
>> rebooted). When this happens, the log shows that for 1-2 seconds no
>> requests are managed (including those on the first machine!).
>> This goes to the point that even if I launch an automated ping (10x a
>> second) on the first machine, the pinging is not logged during the
>> critical seconds.
>>
>> Real example (requests per second logged in access_log):
>> 100
>> 112
>> 102
>> 92
>> 32<-- CRISIS
>> 0<-- PEAK OF THE CRISIS
>> 3<-- CRISIS
>> 25<-- CRISIS
>> 55<-- RECOVERY
>> 98
>> 93
>> 101
>>
>> What can be the reason for this behaviour?
>> Thank you very much for your help. Best regards!
>
> What kind of Load Balancing?
> Apache wouldn't log a ping, since its not a valid HTTP request, so I
> don't know what kind of logging you're talking about.
>


-- 
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Mauro Vanetti :: Pavia
Funambol :: http://www.funambol.com/
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phone :: +39-328-3657696
skype :: mauro.vanetti
email :: mauro@funambol.com
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yahoo :: maurovanetti@yahoo.com
gtalk :: 29settembrepv@gmail.com
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