Re: [opennms-devel] Change default connection pool size to less than 100? Was: [opennms-discuss] 1.3.11 Hangs after hours of running

David Hustace <[email protected]>
Newsgroups gmane.network.opennms.bugs
Message-ID <[email protected]>
On Mar 3, 2008, at 3:58 AM, DJ Gregor wrote:

> Should we change the default connection pool size to something  
> other than 100?

The default is actually 50.  We have it set to:

c3p0.initialPoolSize=50
c3p0.maxPoolSize=50
c3p0.minPoolSize=50

Because of that stupid PostgreSQL bug that we have forever run up  
against when the blocking getConnection() call is made when more  
connections are required in the pool.  If that wasn't a problem then  
we could have better pool configuration.

>
> That happens to be _exactly_ the postgresql default, which seems  
> particularly troubling (oh, you wanted to run 'psql' while opennms  
> is running?  Sorry.).  Also, 100 concurrent connections just seems  
> absolutely huge for all but the largest sites.

The default is 50 and even that is huge for smaller sites.



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