小编Und*_*eek的帖子

什么是cassandra中的突变？它在做什么？我没有找到任何关于它的完整信息...你能回答或分享链接与手册或说明谢谢

我有12行的CF. 每行有6列.我试图$ cf-> get_range('pq_questions','','',1200)它获得所有行但速度太慢(约4-6秒)

Column Family: pq_questions
                SSTable count: 1
                Space used (live): 668363
                Space used (total): 668363
                Number of Keys (estimate): 1280
                Memtable Columns Count: 0
                Memtable Data Size: 0
                Memtable Switch Count: 0
                Read Count: 0
                Read Latency: NaN ms.
                Write Count: 0
                Write Latency: NaN ms.
                Pending Tasks: 0
                Key cache capacity: 200000
                Key cache size: 1000
                Key cache hit rate: 0.10998439937597504
                Row cache capacity: 1000
                Row cache size: 1000
                Row cache hit rate: 0.0
                Compacted row …