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Posted to commits@cassandra.apache.org by "Sam Tunnicliffe (Jira)" <ji...@apache.org> on 2021/03/19 17:20:00 UTC
[jira] [Updated] (CASSANDRA-15177) Reloading of auth caches happens
on the calling thread
[ https://issues.apache.org/jira/browse/CASSANDRA-15177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sam Tunnicliffe updated CASSANDRA-15177:
----------------------------------------
Authors: Sam Tunnicliffe
Impacts: (was: None)
Test and Documentation Plan: Covered by existing python dtests
Status: Patch Available (was: Open)
I had forgotten about this, but we ought to fix it before rc. Reloading eligible items on a thread servicing user requests can cause timeouts and unavailables.
[patch|https://github.com/beobal/cassandra/commits/15177-trunk], [circle|https://app.circleci.com/pipelines/github/beobal/cassandra?branch=cci%2F15177-trunk], [ci-c.a.o|https://ci-cassandra.apache.org/view/patches/job/Cassandra-devbranch/500]
> Reloading of auth caches happens on the calling thread
> ------------------------------------------------------
>
> Key: CASSANDRA-15177
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15177
> Project: Cassandra
> Issue Type: Bug
> Components: Feature/Authorization
> Reporter: Sam Tunnicliffe
> Priority: Normal
>
> When Guava caches were replaced by their Caffeine equivalents in CASSANDRA-10855, the async reloading of stale AuthCache entries was lost due to the use of {{MoreExecutors.directExecutor()}} to provide the delegate executor. Under normal conditions, we can expect these operations to be relatively expensive, and in failure scenarios where replicas for the auth data are DOWN this will greatly increase latency, so they shouldn’t be done on threads servicing requests.
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