如何阅读 cassandra nodetool 直方图百分位和其他列? [英] How to read the cassandra nodetool histograms percentile and other columns?

问题描述

如何读取 cassandra nodetool 直方图百分位和其他列?

How to read the cassandra nodetool histograms percentile and other coulmns?

Percentile  SSTables     Write Latency      Read Latency    Partition Size        Cell Count
                              (micros)          (micros)           (bytes)                  
50%             1.00             14.24           4055.27               149                 2
75%            35.00             17.08          17436.92               149                 2
95%            35.00             24.60          74975.55               642                 2
98%            86.00             35.43         129557.75               770                 2
99%           103.00             51.01         186563.16               770                 2
Min             0.00              2.76             51.01               104                 2
Max           124.00       36904729.27       12359319.16               924                 2

推荐答案

它们显示了指标的分布.例如，在您的数据中，95% 的请求的写入延迟为 24.60 微秒或更短.95% 的分区为 642 字节或更少，只有 2 个单元.SStables 列是读取时触及了多少 sstable，因此 95% 或读取请求正在查看 35 个 sstable(这是相当高的).

They show the distribution of the metrics. For example, in your data the write latency for 95% of the requests were 24.60 microseconds or less. 95% of the partitions are 642 bytes or less with 2 cells. The SStables column is how many sstables are touched on a read, so 95% or read requests are looking at 35 sstables (this is fairly high).

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