cassandra ReadTimeout，readtimeout
前后四次查询，前三次查询错误分别如下， 只有第四次查询出来数据
ReadTimeout: Error from server: code=1200 [Coordinator node timed out waiting for replica nodes' responses] message="Operation timed out - received only 0 responses." info={'received_responses': 0, 'required_responses': 1, 'consistency': 'ONE'}
ReadTimeout: Error from server: code=1200 [Coordinator node timed out waiting for replica nodes' responses] message="Operation timed out - received only 0 responses." info={'received_responses': 0, 'required_responses': 1, 'consistency': 'ONE'}
OperationTimedOut: errors={'172.20.5.2': 'Client request timeout. See Session.execute[_async](timeout)'}, last_host=172.20.5.2
怎么优化集群，蛋疼，英文看着真费劲
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