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From "C. Scott Andreas (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-11994) Expose metrics via CQL interface
Date Mon, 19 Nov 2018 02:25:01 GMT


C. Scott Andreas updated CASSANDRA-11994:
    Component/s: Observability
                 Distributed Metadata

> Expose metrics via CQL interface
> --------------------------------
>                 Key: CASSANDRA-11994
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Metrics, Observability
>            Reporter: Patrick McFadin
>            Priority: Major
>              Labels: cql, operations
> This is an attempt to revive the concept introduced in CASSANDRA-3527. Instead of specifically
targeting JMX metrics, simplify by just exposing metrics into CQL tables as a dynamic view.

> Exposing these metrics will give operators vital insight without resorting to anything
more than what is installed with Apache Cassandra. 
> The scope of these tickets is only for reading metrics with a SELECT command. The actual
data model can be discussed in the comments below. 
> Some basic requirements I would propose:
>  - SELECT syntax should allow for single node or cluster wide statistics
>  - Aggregations should be supported (min, max, avg)
>  - Inside metric tables, future column additions should be automatically created when
new metrics are added to a family
>  - Large schema changes such as deletes should be postponed to a major release 

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