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Real-time Analytics with Storm and Cassandra by Shilpi Saxena

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The nodetool commands

The nodetool command in Cassandra is the most handy tool in the hands of a Cassandra administrator. It has all the tools and commands that are required for all types of situational handling of various nodes. Let's look at a few widely used ones closely:

  • Ring: This command depicts the state of nodes (normal, down, leaving, joining, and so on). The ownership of the token range and percentage ownership of the keys along with the data centre and rack details is as follows:
    bin/nodetool -host 192.168.1.54 ring
    

    The output will be something like this:

    192.168.1.54 datacenter1rack1 Up    Normal 755.25 MB 50.00% 0
    192.168.1.51 datacenter1rack1 Up    Normal 400.62 MB 0.00%  42535295865117307932921825928971026431
    192.168.1.55 datacenter1rack1 ...

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