cassandra 写IO路径

从日志及外围工具了解大致流程

cassandra@cqlsh:ycsb> TRACING on;
cassandra@cqlsh:ycsb> insert into usertable(y_id, field0, field1) values('1', 'f0', 'f1');

Tracing session: 9f327c10-db85-11e9-93d6-478d8c046f59

 activity                                                                                                   | timestamp                  | source       | source_elapsed