Hi
Just want to confirm whether I understand RF and CL correctly.
I have got 2 Cassandra nodes up
C:\Users\manuc\Documents\manu\codingjedi>docker container ps -a
CONTAINER ID IMAGE COMMAND CREATED
STATUS PORTS
NAMES
1923093e84f3 app:30may2020 "/bin/sh -c 'codingj…" 21 hours ago
Up 22 minutes 0.0.0.0:9000->9000/tcp
hardcore_bardeen
381fd5996008 app:30may2020 "/bin/sh -c 'codingj…" 21 hours ago
Exited (255) 24 minutes ago
stupefied_wozniak
85dd140e19dd ca795bbd8fd7 "docker-entrypoint.s…" 21 hours
ago Up 24 minutes 7000-7001/tcp, 7199/tcp, 9042/tcp,
9160/tcp cassandra2
f70caa70fe81 ca795bbd8fd7 "docker-entrypoint.s…" 21 hours
ago Up 25 minutes 7000-7001/tcp, 7199/tcp, 9160/tcp,
0.0.0.0:9042->9042/tcp cassandra1
The Replication Factor for my Keyspace is 3
cqlsh> describe keyspace mykeyspace;
CREATE KEYSPACE mykeyspace WITH replication = {'class': 'SimpleStrategy',
'replication_factor': '3'} AND durable_writes = true;
But when I run a query to add in the database, it successfully gets executed. I
thought that the query will fail as RF is 3.
I suppose I am getting confused between Replication Factor (RF) and Consistency
Level (CL). If less no. of nodes are up then the query will still work as long
as Consistency Level is satisfied. The Consistency Level is one (by default) so
the code works. If I change CL to 3 then the query fails. Regarding RF, when
the 3rd node comes up then it gets the data from other 2 nodes.
Thanks
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