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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13373) Provide additional speculative retry statistics
Date Thu, 23 Mar 2017 23:21:41 GMT
Ariel Weisberg created CASSANDRA-13373:
------------------------------------------

             Summary: 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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