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https://issues.apache.org/jira/browse/CASSANDRA-17062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sam Tunnicliffe updated CASSANDRA-17062:
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Status: Changes Suggested (was: Review In Progress)
[~azotcsit] thanks for the PR, the new VT and tool output look good but I've
got a couple of comments regarding the implementation:
I'm all for the distinction between weighted/unweighted caches at the
presentation layer, but is there really a need to enforce this in the model
code? The only real difference between the types at this level is the units of
size/capacity, which are not explicit and only referenced in comments. I don't
see any harm in the all cache metrics including a {{{}weightedSize{}}}, for
unweighted caches this is just equal to {{size}} and simply isn't included in
the VT/nodetool output.
As implemented, the mechanism of tracking hits/misses isn't correct. Because
the auth caches use {{LoadingCache}} which transparently fetches missing
entries, the hit rate is inflated and the miss rate undercounted. As it is, a
miss would only be recorded if key is not cached *and* isn't found in the
underlying storage. Likewise, a cache miss followed by a load from storage is
counted as a hit.
I've pushed a couple of commits that address these points to
[https://github.com/beobal/cassandra/tree/samt/17062-trunk]. When you get
chance, take a look and see what you think.
> Expose Auth Caches metrics
> --------------------------
>
> Key: CASSANDRA-17062
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17062
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/Virtual Tables, Observability/Metrics,
> Tool/nodetool
> Reporter: Aleksei Zotov
> Assignee: Aleksei Zotov
> Priority: Normal
> Fix For: 4.x
>
>
> Unlike to other caches (row, key, counter), Auth Caches lack some monitoring
> capabilities. Here are a few particular changes to get this inequity fixed:
> # Add auth caches to _system_views.caches_ VT
> # Expose auth caches metrics via JMX
> # Add auth caches details to _nodetool info_
>
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