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

     [ https://issues.apache.org/jira/browse/CASSANDRA-13373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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

Committed as [2c6924b561ddf0b0df9315946b21260d6e27fdb9|https://github.com/apache/cassandra/commit/2c6924b561ddf0b0df9315946b21260d6e27fdb9]

> Provide additional speculative retry statistics
> -----------------------------------------------
>
>                 Key: CASSANDRA-13373
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13373
>             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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