[jira] [Commented] (CASSANDRA-13373) Provide additional speculative retry statistics

["Ariel Weisberg (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-13373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15939432#comment-15939432 ] 

Ariel Weisberg commented on CASSANDRA-13373:
--------------------------------------------

||Code|utests|dtests||
|[trunk|https://github.com/apache/cassandra/compare/trunk...aweisberg:cassandra-13373-trunk?expand=1]|[utests|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-cassandra-13373-trunk-testall/1/]|[dtests|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-cassandra-13373-trunk-dtest/1/]|

> 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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