有没有办法弄清楚每张桌子上有多少请求(读/写)?
我想弄清楚我们在哪里有很大的负担。
已经尝试使用:
nodetool tablestats
这不好,因为我看不到请求的数量。
谢谢
有没有办法弄清楚每张桌子上有多少请求(读/写)?
我想弄清楚我们在哪里有很大的负担。
已经尝试使用:
nodetool tablestats
这不好,因为我看不到请求的数量。
谢谢
tablestats
将为您提供可能足够的请求总数。还可以查看异常值的平均本地读/写延迟。费率在 JMX 中公开,您可以从表指标中获取: http: //cassandra.apache.org/doc/latest/operating/metrics.html#table-metrics
org.apache.cassandra.metrics:type=Table keyspace=<Keyspace> scope=<Table> name=<MetricName>
Metric Name Tye Description
--------------------------------------------------------------------------
ReadLatency Latency Local read latency for this table.
RangeLatency Latency Local range scan latency for this table.
WriteLatency Latency Local write latency for this table.
CoordinatorReadLatency Timer Coordinator read latency for this table.
CoordinatorWriteLatency Timer Coordinator write latency for this table.
CoordinatorScanLatency Timer Coordinator range scan latency for this table.
每个都有 1、5 和 15 分钟的速率属性。
即用瑞士爪哇刀:
java -jar sjk.jar mx -p {PID} -b org.apache.cassandra.metrics:type=ColumnFamily,keyspace=<Keyspace>,scope=<Table>,name=CoordinatorReadLatency --attribute FiveMinuteRate --get
(注意:以与您的 cassandra 实例运行时相同的用户身份运行它,sudo -u
或者它可能没有附加到 jvm 的权限)
如果当前运行的负载很高,您可以使用toppartitions
或profileload
。在某些版本中,toppartitions 需要你给它表格。
#> nodetool profileload
Frequency of reads by partition:
Table Partition Count +/-
basic.wide row1 75424 0
basic.cas p1 656 0
system.paxos 7031 550 0
system.local local 2 0
Frequency of writes by partition:
Table Partition Count +/-
system.paxos 7031 585 0
basic.cas p1 112 0
basic.wide row4864 20 19
basic.wide row4870 20 19
basic.wide row4868 20 19
basic.wide row4871 20 19
Frequency of cas contentions by partition:
Table Partition Count +/-
basic.cas p1 76 0
Max mutation size by partition:
Table Partition Bytes
basic.wide row0 1056
basic.wide row7 1056
basic.wide row11 1056
basic.wide row59 1056
basic.wide row255 1056
Longest read query times:
Query Microseconds
SELECT * FROM basic.wide WHERE key = row1 LIMIT 5000 25681
SELECT * FROM basic.wide WHERE key = row1 LIMIT 5000 16131
SELECT * FROM basic.wide WHERE key = row1 LIMIT 5000 14715
SELECT * FROM system_schema.columns 2784
SELECT * FROM system_schema.columns 2285
SELECT * FROM system_schema.tables 1553
SELECT * FROM system_schema.tables 1275