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I am using Redis to store two databases : 0 and 1 via the Redis-py client library. I would like to create two connections for each database. Currently, I am doing this :
>>> connection0 = redis.Connection(host = 'localhost', port = 6379, db = 0)
>>> connection1 = redis.Connection(host = 'localhost', port = 6379, db = 1)
>>> connection0.connect()
However, I don't seem to find a way to create a Redis object from the connection.
>>> store0 = redis.Redis(connection0)
>>> store0.info()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/client.py", line 341, in info
return self.execute_command('INFO')
File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/client.py", line 278, in execute_command
connection.send_command(*args)
File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/connection.py", line 258, in send_command
self.send_packed_command(self.pack_command(*args))
File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/connection.py", line 241, in send_packed_command
self.connect()
File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/connection.py", line 187, in connect
sock = self._connect()
File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/connection.py", line 198, in _connect
sock.connect((self.host, self.port))
File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/socket.py", line 224, in meth
return getattr(self._sock,name)(*args)
TypeError: coercing to Unicode: need string or buffer, Connection found
Am I making a rookie mistake here?
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Maximum Concurrent Connected Clients In Redis 2.4 there was a hard-coded limit for the maximum number of clients that could be handled simultaneously. In Redis 2.6 and newer, this limit is dynamic: by default it is set to 10000 clients, unless otherwise stated by the maxclients directive in redis. conf .
Redis can handle many connections, and by default, Redis has a maximum number of client connections set at 10,000 connections. You can set the maximum number of client connections you want the Redis server to accept by altering the maxclient from within the redis.
Redis-py provides a connection pool for you from which you can retrieve a connection. Connection pools create a set of connections which you can use as needed (and when done - the connection is returned to the connection pool for further reuse).
You really shouldn't create connections like that. Let me quote the redis-py documentation.
Behind the scenes, redis-py uses a connection pool to manage connections to a Redis server. By default, each Redis instance you create will in turn create its own connection pool. You can override this behavior and use an existing connection pool by passing an already created connection pool instance to the connection_pool argument of the Redis class. You may choose to do this in order to implement client side sharding or have finer grain control of how connections are managed.
>>> pool = redis.ConnectionPool(host='localhost', port=6379, db=0)
>>> r = redis.StrictRedis(connection_pool=pool)
You cannot specify a single connection to be used with the library. Each Redis instance will have its own connection pool. When execute_command() is called, it will pop a connection from a the pool(or open a new one) and use that connection. If you only want your client to have max one connection at a time, set max_connections to 1.
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