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Subject: DO NOT REPLY [Bug 46676] New: Configurable test request for Watchdog
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Message-ID: <bug-46676-78@https.issues.apache.org/bugzilla/>
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Date: Mon,  9 Feb 2009 03:42:16 -0800 (PST)

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: dev@tomcat.apache.org
        ReportedBy: gerhardus.geldenhuis@gmail.com


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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