I have a TC instance running on an EC2 in an AWS Autoscaling group. I
have a database with 500 max connections. The default EC2 count is 2
instances in the autoscaling group. I guess that means that I should
set the Tomcat resource config for this datasource to be maxTotal = 250,
so if both instances max out we never exceed the 500 db max. But sooner
or later, the auto-scaling group is going to add a third and maybe a
fourth instance at some crunch time, all still talking to the same
database. Now we have a maxTotal combined of 1000 connections talking
to a database that can handle 500 which seems to be a recipe for
disaster. Yet I want to utilize all 500 available connections when I
have one two EC2 instances running.
Is there something I can do inside TC to rebalance the maxTotal
connections available to each TC instance as instances are added and
removed?
Other suggestions?
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