所以我一直面临着一些性能问题以及我的一个应用程序，并试图了解它是否与Cassandra正在使用的空间相关联。以下是在CF上获得的cfstats：
SSTable count: 4
Space used (live): 58123071
Space used (total): 58123071
Space used by snapshots (total): 0
Off heap memory used (total): 78360
SSTable Compression Ratio: 0.27312902549932555
Number of keys (estimate): 37373
Memtable cell count: 30476
Memtable data size: 1002302
Memtable off heap memory used: 0
Memtable switch count: 25
Local read count: 2177337
Local read latency: 0.273 ms
Local write count: 203794
Local write latency: 0.015 ms
Pending flushes: 0
Bloom filter false positives: 74
Bloom filter false ratio: 0.00000
Bloom filter space used: 51824
Bloom filter off heap memory used: 51792
Index summary off heap memory used: 22536
Compression metadata off heap memory used: 4032
Compacted partition minimum bytes: 104
Compacted partition maximum bytes: 1916
Compacted partition mean bytes: 889
Average live cells per slice (last five minutes): 14.242626658160864
Maximum live cells per slice (last five minutes): 19.0
Average tombstones per slice (last five minutes): 0.0
Maximum tombstones per slice (last five minutes): 0.0
此处使用的实时空间量是问题还是可以接受？读取延迟是否在可容忍的范围内？运行Cassandra 2.1.11