DB.open() has 9 open connections with a pool_size of 7 with ZEO

I got the warning in the subject line for a DB created with
dbname = "./zeotalk" 
db = ZEO.DB(dbname)
I have multiple threads (not processes) opening connections against the shared db.

http://www.zodb.org/en/latest/reference/zodb.html#databases shows DB takes a pool_size argument,
so I tried
db = ZEO.DB(dbname, pool_size=nThreads+2)
resulting in
  File "./tng.py", line 17, in <module>
    db = ZEO.DB(dbname, pool_size=nThreads+2)
  File "/home/ross/.local/lib/python3.4/site-packages/ZEO-5.0.1-py3.4.egg/ZEO/__init__.py", line 29, in DB
    s = client(*args, **kw)
  File "/home/ross/.local/lib/python3.4/site-packages/ZEO-5.0.1-py3.4.egg/ZEO/__init__.py", line 26, in client
    return ZEO.ClientStorage.ClientStorage(*args, **kw)
TypeError: __init__() got an unexpected keyword argument 'pool_size'

Looking around in the ZEO source, __init__.py has
def client(*args, **kw):
    import ZEO.ClientStorage
    return ZEO.ClientStorage.ClientStorage(*args, **kw)

def DB(*args, **kw):
    s = client(*args, **kw)
    try:
        import ZODB
        return ZODB.DB(s)
    except Exception:
        s.close()
        raise
and ClientStorage.__init__ does not have a pool_size argument.

I guess I could do a version of the DB function defined above that allowed me to pass parameters to the ZODB.DB method.  Is that the right approach?  Should I be setting something when I start the ZEO server?

Thanks.
Ross

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