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https://issues.apache.org/jira/browse/CASSANDRA-13373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15939432#comment-15939432
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Ariel Weisberg commented on CASSANDRA-13373:
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||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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