ApplicationError: 1033 Instance has too many concurrent requests 100 -- When connecting to G Cloud SQL

[JJC]

Hello,

I'm getting this error when attempting to connect to the Google Cloud
SQL database from my Google App Engine app after a couple hundred
clients attempt to query it.  So as not to repeat myself and have more
folks involved in the discussion, note that I've submitted a Stack
Overflow question with more details here:
http://stackoverflow.com/questions/10424442/what-are-the-connection-limits-for-google-cloud-sql-from-app-engine-and-how-to

I thought that there were no limits for connections from GAE to GC-
SQL?  Has anyone had similar issues?

Relatedly, I'm trying to cache/reuse database connection from GAE by
storing a handle in os.environ, but this hasn't helped.  Anyone have
any tips for how best to manage/reuse a connection across GAE app
instantiations?

(Billing should not be an issue as we have a nearly unlimited budget in the research app we're using, and the dashboard doesn't indicate any such issues.)

Many thanks in advance,
JJC

(Cross-posted on Google Cloud SQL Discuss, as I'm not certain which is causing the problem).