[jira] [Commented] (CASSANDRA-16957) Actively update auth caches in the background

["Caleb Rackliffe (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-16957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17438952#comment-17438952 ] 

Caleb Rackliffe commented on CASSANDRA-16957:
---------------------------------------------

Completed my first pass at review, leaving several minor comments in the PR. Do we want to add any testing for the new hot-props? (i.e. Enabling and disabling active refresh.) I wouldn't consider that a blocker for committing this, but figured I'd mention it.

> Actively update auth caches in the background
> ---------------------------------------------
>
>                 Key: CASSANDRA-16957
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16957
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Feature/Authorization
>            Reporter: Josh McKenzie
>            Assignee: Josh McKenzie
>            Priority: Normal
>             Fix For: 4.x
>
>
> Currently the guava cache backing the various auth caches refreshes its data lazily; you won't get an update on cached credentials until you try and read them and they're expired. For the PasswordCache in particular, this not only gives us a window of async "serve the old while you fetch the new" which isn't ideal, but also causes the cache to be invalidated and thus not adding value / perf after expiration period (24h I believe by default).
> The expected behavior after this change is for the caches to auto-refresh themselves on an interval so you a) don't have stale data sitting around waiting to be served, and b) getting invalidated so having effectively a dead cache for intermittent users assuming you have the backing resources to serve them proactively.



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