How to know the size of a keyspace and column family in Cassandra?

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情话喂你
情话喂你 2021-02-05 10:21

Recently I\'ve started working on Grails integration with Cassandra using the Java driver for cassandra(cassandra-driver-core-2.0.2). So I was curious to know how we can find ou

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  • 2021-02-05 10:51

    To get statistics regarding column families in Cassandra, you can simply run the command:

    nodetool cfstats
    

    It reports statistics about tables which include the live data size as well as on disk.

    The documentation about this utility for Cassandra 2.1 is available here.

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  • 2021-02-05 10:56

    You can use both the command below based on old and new version of Cassandra.

    nodetool cfstats or nodetool tablestats

    Above command will give you size details about keyspace and table. Also you can refer below link to get more ddetails about how to use with different options https://docs.datastax.com/en/dse/6.7/dse-dev/datastax_enterprise/tools/nodetool/toolsTablestats.html

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  • 2021-02-05 11:01

    To get the statistics regarding column families in Cassandra with respect to keyspaces or tables, you can simply run the below command:

    nodetool cfstats

    Result: This will return the complete statistics related to available keyspaces.

    But, in case you want to find out the statistics of specific keyspaces or tables, run below command:

    For Keyspace(s) : nodetool cfstats <keyspace_name> OR nodetool cfstats -H <keyspace_name>

    For Table(s) : nodetool tablestats <keyspace_name>.<table_name> OR nodetool tablestats -H <keyspace_name>.<table_name>

    Note: -H denotes Human Readable format

    For more details please refer, nodetool cfstats

    Findings:

    1. You might see SSTable count as 0

    2. Space used (live) and Space used (total) as 0 bytes

    To know WHY(s) of the above two findings please refer: Reason of why SSTable count shown as 0

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  • 2021-02-05 11:06

    I've created a small script to print nodetool results in a nice table:

    #!/bin/sh
    nodetool cfstats -H | awk -F ' *: *' '
      BEGIN { print "Keyspace,Table,Live,Total" }
      /^Keyspace : / { ks = $2 }
      /\tTable:/ { t = $2 }
      /\tSpace used .live/ { sp = $2 }
      /\tSpace used .total/ { print ks "," t "," sp "," $2 }
    ' | column -s , -t
    
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