Hi,
good questions. First of all: I just today wrote a new docs page about
timeouts. We are soon releasing 1.2.24 which contains this page. You can
already look at it under
http://people.apache.org/~rjung/mod_jk-dev/docs/
(The new page is named "Timeouts" and part of the group Generic Howtos.
Also the new docs contain a better explanation, what retries means,
especially the huge difference between retries for an lb worker and a
usual worker. This info is on the updated workers.properties page in the
reference guide.
With these settings how could I expect the connector to behave if:
1. Tomcat dies and the port is no longer listening resulting in an
immediate icmp response.
I would expect, that any attempt to use an existing connection or to
open a new one immediately returns with an error, because the remote
machine rejects the communication. Further JK behaviour is now depending
if you are using a load balancer or not. Se retries etc. in the updated
docs.
2. The box hosting tomcat dies or the tcp stack for whatever reason
tanks resulting in no immediate icmp response.
As long as your local system or the last router still has an arp entry
for the died machine, you will run into very long TCP timeouts. We
recommend CPing/CPong, see the new Timeouts page.
3. The connector does make a successful connection to the backend
tomcat worker only to have that worker become slow and almost
unresponsive.
You should use CPing/CPong and reply timeouts. See again the new
Timeouts page. If you don't use an lb, the best you can do is throwing
an error early, such that the rest of the infrastructure doesnt get
congested.
Are there more directives I should be concerned with? Currently, I have
no intentions on monitoring the http response status codes to detect
errors.
Look at the new page and look at the workers.properties page of the
reference guide. Use a load balancing worker, set recovery_options etc.
HTH.
Regards,
Rainer
P.S.: If you have suggestions how to improve the new page: it's not
public yet. If you are fast enough, we can include those changes.
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