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https://issues.apache.org/jira/browse/IMPALA-9473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joe McDonnell resolved IMPALA-9473.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> Add counts of the number of hits, misses, and cache entries
> -----------------------------------------------------------
>
> Key: IMPALA-9473
> URL: https://issues.apache.org/jira/browse/IMPALA-9473
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 3.4.0
> Reporter: Joe McDonnell
> Assignee: Joe McDonnell
> Priority: Major
> Fix For: Impala 4.0
>
>
> The data cache currently reports metrics about hit bytes, miss bytes, and
> total bytes in the cache. Since there are entries of a variety of sizes in
> the cache, it is useful to have the actual counts for hits, misses, and total
> number of entries in the cache.
> The cache improves performance more by reducing the latency of requests
> (proportional to # of hits) than by increasing the bandwidth of transfers
> (proportional to # of bytes). Cache performance may improve by preferring
> smaller entries and thus hit bytes. It is useful to track both types of
> metrics.
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