Dear Apache2 community,
with an important bug fix in "mod_proxy_ajp" of Apache 2.2.22 (see http://www.apache.org/dist/httpd/CHANGES_2.2.22), a problem marking an AJP-worker (used for communication between Apache and Tomcat) in error state when a single long running request occurred, should have gone.
Important: the documentation and change log tells nothing about the condition and pre-requisites that have to be setup, to allow that bug fix to work. Is it right, that within a "BalancerMember" configuration directive, the "ping" value for cping/cping communication (details can be found here: http://httpd.apache.org/docs/2.2/mod/mod_proxy.html#balancermember) should be set to a value different compared to the default value (=0)?
This conclusion might be right, when taking a look on the commit comment and the implementation of the bug fix in Apache 2.2.22 (http://mail-archives.apache.org/mod_mbox/httpd-cvs/201201.mbox/%3C20120104201529.54EA823888D2@xxxxxxxxxxxxxxx%3E):
...
/* If we had a successful cping/cpong and then a timeout
+ * we assume it is a request that cause a back-end timeout,
+ * but doesn't affect the whole worker.
+ */
+ if (APR_STATUS_IS_TIMEUP(status) && conn->worker->ping_timeout_set)
{
+ return HTTP_GATEWAY_TIME_OUT;
+ }
Do you agree?
Our experience is: when having not specified a "ping" configuration property in a BalancerMember directive like:
BalancerMember ajp://rb-wcmstc1.xx.xxxxx.com:8009 loadfactor=100 retry=10 route=rb-wcmstc1 connectiontimeout=5 timeout=30
the bug fix does not work and Apache 2.2.22 will set the Tomcat AJP worker in ERROR state when a requests takes longer than the configured timeouts, e.g. the reply took longer than 30 seconds here.
My question is:
- is this ping property a must have to let this bug fix work properly?
- which conditions lead to an ERROR-state switch?
Mit freundlichen Grüßen / Best regards,
Holger King
CI/AFP2
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