Connection pool errors with Cassandra driver

[Ander Ustarroz]

I am running a web application with Python 3.5.2, uWSGI 2.0.11.2, cassandra-driver 3.6.0, cassandra 3.7. Using a Cassandra cluster  with 3 nodes: 

Node 1 (172.17.0.4), 

Node 2 (172.17.0.5), 

Node 3 (172.17.0.6)

And I am getting the following errors anytime I'am trying to connect to the site:

Respawned uWSGI worker 2 (new pid: 90)
mapping worker 2 to CPUs: 3 4 5
2016-09-14 21:00:47,434 WARNI [cassandra.cluster][Thread-2] Failed to create connection pool for new host 172.17.0.4:

Traceback (most recent call last):
 File "cassandra/cluster.py", line 2232, in cassandra.cluster.Session.add_or_renew_pool.run_add_or_renew_pool (cassandra/cluster.c:38826)
 File "cassandra/pool.py", line 328, in cassandra.pool.HostConnection.__init__ (cassandra/pool.c:6243)
 File "cassandra/cluster.py", line 1107, in cassandra.cluster.Cluster.connection_factory (cassandra/cluster.c:14943)
 File "cassandra/connection.py", line 330, in cassandra.connection.Connection.factory (cassandra/connection.c:5766)
cassandra.OperationTimedOut: errors=Timed out creating connection (5 seconds), last_host=None

2016-09-14 21:00:47,437 WARNI [cassandra.cluster][Thread-1] Failed to create connection pool for new host 172.17.0.6:
Traceback (most recent call last):
 File "cassandra/cluster.py", line 2232, in cassandra.cluster.Session.add_or_renew_pool.run_add_or_renew_pool (cassandra/cluster.c:38826)
 File "cassandra/pool.py", line 328, in cassandra.pool.HostConnection.__init__ (cassandra/pool.c:6243)
 File "cassandra/cluster.py", line 1107, in cassandra.cluster.Cluster.connection_factory (cassandra/cluster.c:14943)
 File "cassandra/connection.py", line 330, in cassandra.connection.Connection.factory (cassandra/connection.c:5766)
cassandra.OperationTimedOut: errors=Timed out creating connection (5 seconds), last_host=None

...The work of process 19 is done. Seeya!
worker 7 killed successfully (pid: 19)

I have posted more detailed information about this issue here.





Any help will be appreciated.

[Adam Holmberg]

Thanks for linking SO and not leaving it to us to correlate. :) 

I responded there.

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