Cassandra optimization of query optimization timeout

After the pre-holiday migrate oracle data to cassandra, the total number (more than ten million) record lookup table, there will always report a timeout error to find the next relevant information, we need to change the configuration file of the relevant parameters timeout.

1、ReadTimeout-1200

cqlsh:spacewalk> select count(*) from rhnpackagecapability;
ReadTimeout: Error from server: code=1200 [Coordinator node timed out waiting for replica nodes' responses] message="Operation timed out - received only 1 responses." info={'received_responses': 1, 'required_responses': 1, 'consistency': 'ONE'}
cqlsh:spacewalk> exit

Encounter this error, simply increase the value of the following parameters:

[root@db03 ~]# vi /etc/cassandra/default.conf/cassandra.yaml
read_request_timeout_in_ms: 600000
range_request_timeout_in_ms: 600000
slow_query_log_timeout_in_ms: 600000
[root@db03 ~]# systemctl restart cassandra

After editing, cassandra restart the service. Query again, the results as shown below:

2、Client request timeout

The default client request time is 10 seconds, if you encounter this error, the need to increase the client request timeout. as follows:

[root@db03 ~]# vi .cassandra/cqlshrc 
...
[connection]
request_timeout = 600
....

Subsequent encounter similar error will continue to update this blog.