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Posted to issues-all@impala.apache.org by "Joe McDonnell (Jira)" <ji...@apache.org> on 2020/03/06 19:13:00 UTC

[jira] [Created] (IMPALA-9473) Add counts of the number of hits, misses, and cache entries

Joe McDonnell created IMPALA-9473:
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             Summary: 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


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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