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https://issues.apache.org/jira/browse/CASSANDRA-14865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pedro Gordo updated CASSANDRA-14865:
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Attachment: wec_dc.txt
nec_dc.txt
cn_dc.txt
> Cascading calls to read retries, system_auth, and read repairs
> --------------------------------------------------------------
>
> Key: CASSANDRA-14865
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14865
> Project: Cassandra
> Issue Type: Bug
> Reporter: Pedro Gordo
> Priority: Major
> Fix For: 3.11.1
>
> Attachments: cn_dc.txt, nec_dc.txt, wec_dc.txt
>
>
> Roles validity and permission cache values are the default ones. Same thing
> for the read-repair chance.
> We have a cluster with 3 data centers. We have noticed that in 2 of the data
> centers (NEC and CN) we have multiple calls to speculative read retries
> (rapid read protection), roles (instead of using cached values within the
> same tracing session), and multiple read repair messages.
> We would expect only one call to roles, within sequential read sessions,
> because the cache could be turned, but not so many calls within the same
> tracing session. Same thing for read-retries, and read repair messages. We
> are discarding blocking read repairs possibility because we consistently get
> the same results when doing the query several times.
> It feels like something is cascading calls to these mechanisms regardless of
> conditions that would prevent them from being called (cached roles values for
> instance).
> I have attached tracing files from the 3 data centers. Please let me know if
> more info is needed.
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