I am going through Psycopg Connections Pooling documentation, and don't understand what is the purpose of 'key' argument in getconn and putconn?
What is the meaning of 'key' in psycopg connection pooling?
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Perusing the source code of psycopg2 (
lib/pool.py
) you can see that thepsycopg2.pool.AbstractConnectionPool
class has adict
attribute named_used
where the connections in the pool are referenced. Thekey
parameter in thegetconn
andputconn
methods is the the key to the items in that dictionary. By default, if the value of thekey
parameter of these methods isNone
theid
of the connection object is used as the key.Basically the
key
parameter allows implementers of concrete connection pool classes to identify connections. For example, in thepsycopg2.pool.PersistentConnectionPool
class, a single connection is meant to be shared in a single thread, so the thread ID is used as the key.