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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: How to detect down of tomcat.
Date Tue, 22 Mar 2011 18:11:54 GMT
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Hide,

On 3/19/2011 10:38 PM, Hide wrote:
> How to detect down of tomcat.

Note that the responses you've been getting are only testing for the
Tomcat process still running in some way. There are probably a lot of
scenarios where you consider Tomcat "down" yet it is still running. Some
that come to mind:

1. Database connection pool has been exhausted so no work can complete
2. Request processors are all tied up waiting on some lock
3. A connector has failed and is no longer accepting connections

These are all situations where a Tomcat restart may be in order but the
"check the process list" technique will fail to detect them.

We have a "status" page that checks the health of our server and we use
wget in a script to check the data that comes back. Something like that
will be more reliable than just checking the OS's process table.

- -chris
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