Github user jelmerterwal commented on the issue:
https://github.com/apache/tomcat/pull/54
For an application I develop, I see a drop in connections. The screenshot
show different values of the connection pool.
Legend for the colours;
- grey -> pool size
- greenish -> idle connections
- orange/red -> connections in use
- purple -> waiting for a connection
The application uses dropwizard (www.dropwizard.io) which internally uses
Tomcat's JDBC Pool. The application has 4 instances. The graph shows the sum of
these instances for the number of connections.
- min size of idle connection is set to 10 (so should be 10 x 4 = 40)
- the decrease happens due abandoning of connections
The documentation indicates a minimum pool of idle connections should be
available. It scared me when I first saw this happening.
```
minIdle
(int) The minimum number of established connections that should be kept in
the pool at all times. The connection pool can shrink below this number if
validation queries fail. Default value is derived from initialSize:10 (also see
testWhileIdle)
```
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