获得表状态(如总行数)和当前工作负载(如cassandra的op/s)的最佳方法?

hxzsmxv2  于 2021-06-14  发布在  Cassandra
关注(0)|答案(0)|浏览(198)

我正在尝试两件关于我们基于cassandra的应用程序的事情,这是不可能为了测试目的而停止所有服务的:
使用python驱动程序测试op/s和99.9%延迟等性能。为了得到更准确的结果,我们需要知道当前的工作负载,例如cassandra的读写操作。
获取一些信息,比如一个表包含的总行数(我们的表目前有将近80亿条记录)&每周插入多少条记录(有一些数据源我们无法控制,因此很难直接从insert脚本获取这些信息)。
我尝试了一些解决这两个问题的方法:
在评论中更新。 select count(*) from 根本不起作用,而且太慢了。我试着利用 nodetool tablestats ,以分布式系统为例:

Keyspace : system_distributed
    Read Count: 0
    Read Latency: NaN ms
    Write Count: 0
    Write Latency: NaN ms
    Pending Flushes: 0
        Table: parent_repair_history
        SSTable count: 0
        Space used (live): 0
        Space used (total): 0
        Space used by snapshots (total): 0
        Off heap memory used (total): 0
        SSTable Compression Ratio: -1.0
        Number of partitions (estimate): 0
        Memtable cell count: 0
        Memtable data size: 0
        Memtable off heap memory used: 0
        Memtable switch count: 0
        Local read count: 0
        Local read latency: NaN ms
        Local write count: 0
        Local write latency: NaN ms
        Pending flushes: 0
        Percent repaired: 100.0
        Bloom filter false positives: 0
        Bloom filter false ratio: 0.00000
        Bloom filter space used: 0
        Bloom filter off heap memory used: 0
        Index summary off heap memory used: 0
        Compression metadata off heap memory used: 0
        Compacted partition minimum bytes: 0
        Compacted partition maximum bytes: 0
        Compacted partition mean bytes: 0
        Average live cells per slice (last five minutes): NaN
        Maximum live cells per slice (last five minutes): 0
        Average tombstones per slice (last five minutes): NaN
        Maximum tombstones per slice (last five minutes): 0
        Dropped Mutations: 0
        Table: repair_history
        SSTable count: 0
        Space used (live): 0
        Space used (total): 0
        Space used by snapshots (total): 0
        Off heap memory used (total): 0
        SSTable Compression Ratio: -1.0
        Number of partitions (estimate): 0
        Memtable cell count: 0
        Memtable data size: 0
        Memtable off heap memory used: 0
        Memtable switch count: 0
        Local read count: 0
        Local read latency: NaN ms
        Local write count: 0
        Local write latency: NaN ms
        Pending flushes: 0
        Percent repaired: 100.0
        Bloom filter false positives: 0
        Bloom filter false ratio: 0.00000
        Bloom filter space used: 0
        Bloom filter off heap memory used: 0
        Index summary off heap memory used: 0
        Compression metadata off heap memory used: 0
        Compacted partition minimum bytes: 0
        Compacted partition maximum bytes: 0
        Compacted partition mean bytes: 0
        Average live cells per slice (last five minutes): NaN
        Maximum live cells per slice (last five minutes): 0
        Average tombstones per slice (last five minutes): NaN
        Maximum tombstones per slice (last five minutes): 0
        Dropped Mutations: 0
        Table: view_build_status
        SSTable count: 0
        Space used (live): 0
        Space used (total): 0
        Space used by snapshots (total): 0
        Off heap memory used (total): 0
        SSTable Compression Ratio: -1.0
        Number of partitions (estimate): 0
        Memtable cell count: 0
        Memtable data size: 0
        Memtable off heap memory used: 0
        Memtable switch count: 0
        Local read count: 0
        Local read latency: NaN ms
        Local write count: 0
        Local write latency: NaN ms
        Pending flushes: 0
        Percent repaired: 100.0
        Bloom filter false positives: 0
        Bloom filter false ratio: 0.00000
        Bloom filter space used: 0
        Bloom filter off heap memory used: 0
        Index summary off heap memory used: 0
        Compression metadata off heap memory used: 0
        Compacted partition minimum bytes: 0
        Compacted partition maximum bytes: 0
        Compacted partition mean bytes: 0
        Average live cells per slice (last five minutes): NaN
        Maximum live cells per slice (last five minutes): 0
        Average tombstones per slice (last five minutes): NaN
        Maximum tombstones per slice (last five minutes): 0
        Dropped Mutations: 0

有些参数我无法理解:
答。本地写入计数是什么意思?如果一个表分布在不同的节点上,并且有多个副本,那么如何计算该表的行数?
b。前5行(读计数、写计数)是否描述了该键空间的信息(system\u distributed)?
c。这里的所有延迟是指平均延迟吗
如果你们能给我任何建议,我将不胜感激。
嘉实

暂无答案!

目前还没有任何答案,快来回答吧!

相关问题