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From "Ariel Weisberg (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-13373) Provide additional speculative retry statistics
Date Mon, 03 Apr 2017 22:32:42 GMT


Ariel Weisberg updated CASSANDRA-13373:
    Resolution: Fixed
        Status: Resolved  (was: Ready to Commit)

Committed as [2c6924b561ddf0b0df9315946b21260d6e27fdb9|]

> Provide additional speculative retry statistics
> -----------------------------------------------
>                 Key: CASSANDRA-13373
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Observability
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>             Fix For: 4.x
> Right now there is a single metric for speculative retry on reads that is the number
of speculative retries attempted. You can't tell how many of those actually succeeded in salvaging
the read.
> The metric is also per table and there is no keyspace level rollup as there is for several
other metrics.
> Add a metric that counts reads that attempt to speculate but fail to complete before
the timeout (ignoring read errors).
> Add a rollup metric for the current count of speculation attempts as well as the count
of failed speculations.

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