https://issues.apache.org/bugzilla/show_bug.cgi?id=46676
Summary: Configurable test request for Watchdog thread
Product: Tomcat Connectors
Version: 1.2.27
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: mod_jk
AssignedTo: [email protected]
ReportedBy: [email protected]
It would be really great to have a configurable thread to test for the
availability of a node in a cluster by the watchdog thread. The ping test is
not always enough and in a production environment you don't really want
production threads to be used as a way of testing whether a node is available
or not.
In our environment we use the web interface of modjk programatically to
stop/start (remove/add to cluster) tomcat nodes in a load balanced cluster
while they are upgraded. If the watchdog thread were extended the following
additions to the web interface would be handy:
A function to test a node using the configured request.
A function to enter a custom url test string to test the node.
Furthermore if the test url could be set dynamically without needing a config
reload it would be very handy to do dynamic differentiated testing during the
course of a day.
As a start a url and search string to match on the page would probably be
enough.
Eg
TestUrl='localhost:/myapp/deployinfo.jsp'
TestString='hello world'
Maybe in the future one could extend this even more to submit xml(soap,
something else) to a server and have a seperate parser/program to evaluate the
result. This is probably beyond the scope of modjk but I thought it good to
mention non the less for any interesting other ideas it might provoke.
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