Cassandra nodetool by examples

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To monitor an Apache Cassandra cluster from the command line interface (CLI), you can use the nodetool utility, which is a powerful command-line tool specifically designed for managing and monitoring Cassandra clusters. Here are some key commands and their functionalities:

Key nodetool Commands

  • Check Cluster Status:

    nodetool status

    This command displays the status of all nodes in the cluster, including whether they are up or down, their load, and other important metrics.

  • Column Family Statistics:

    nodetool cfstats [keyspace_name].[table_name]

    This command provides detailed statistics for a specific table (column family), including read/write counts, disk space used, and more.

  • Thread Pool Statistics:

    nodetool tpstats

    This command shows statistics about thread pools used for read, write, and mutation operations, helping to identify potential bottlenecks.

  • Network Statistics:

    nodetool netstats

    This command displays information about network activity, including pending hints and the status of streaming operations.

  • Compaction Stats:

    nodetool compactionstats

    This command provides information about ongoing compactions, which can be useful for performance tuning.

  • Cluster Information:

    nodetool info

    This command gives a summary of the node's configuration and status within the cluster.

Additional Monitoring Options

For more advanced monitoring, you may also consider integrating tools like Prometheus and Grafana for visualization or using cloud-based solutions such as Datadog or New Relic. These tools can provide real-time metrics and alerts based on your Cassandra cluster's performance.

Using nodetool effectively allows you to maintain a healthy Cassandra environment by providing insights into its operational metrics directly from the CLI.

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