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Subject DO NOT REPLY [Bug 45501] pending-request lbmethod for mod_proxy_balancer
Date Wed, 30 Jul 2008 13:08:09 GMT

--- Comment #2 from Rainer Jung <>  2008-07-30 06:08:09 PST ---
Sharing some experience from mod_jk: incrementing/decrementing could lead to
incorrect counters. There might be subtle differences here, why it could be
correct in the mod_proxy_balancer setup, but with mod_jk and 64 Bit counters in
shared memory we noticed cases, were the busy counter under load slowly got an
offset (e.g. ended up in getting negative). Not sure, if it was because of 64
Bit counters (non atomic), shared memory or maybe other factors like graceful
restarts. We ended up in checking busy for being >0 before decrementing it in
order to at least limit damage of one of the two possible increment/decrement

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