问题
I get the following error:
cqlsh:dev> SELECT DISTINCT id FROM raw_data;
Request did not complete within rpc_timeout.
This is a special query that I'll never make again, I don't care how long it takes, and I don't want to change my schema (since I'll never make the query again...).
How can I increase rpc_timeout for this one query?
I have tried adding LIMIT 9999 and ALLOW FILTERING, and it doesn't help. I expect less than 1000 rows in the result. The query works on another Cassandra cluster with half as much data.
Edit: as it turns out, this particular command succeeded after I ran nodetool compact, but what I'm more interested in the general case of temporarily increasing rpc_timeout for one query.
回答1:
increase the read request time in cassandra.yaml file under /cassandra/conf
read_request_timeout_in_ms: 30000
change this restart server and execute your query, might be your problem get resolved.
来源：https://stackoverflow.com/questions/24899220/rpc-timeout-in-cassandra