[jira] [Updated] (IMPALA-9471) Improve data cache metrics

["Joe McDonnell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-9471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joe McDonnell updated IMPALA-9471:
----------------------------------
    Summary: Improve data cache metrics  (was: To monitor the data cache, there are several improvements to metrics that would help. This tracks all the distinct metrics changes.)

> Improve data cache metrics
> --------------------------
>
>                 Key: IMPALA-9471
>                 URL: https://issues.apache.org/jira/browse/IMPALA-9471
>             Project: IMPALA
>          Issue Type: Epic
>          Components: Backend
>    Affects Versions: Impala 3.4.0
>            Reporter: Joe McDonnell
>            Assignee: Joe McDonnell
>            Priority: Major
>
> Currently, the data cache has the following metrics:
> {noformat}
> impala-server.io-mgr.remote-data-cache-hit-bytes
> impala-server.io-mgr.remote-data-cache-miss-bytes
> impala-server.io-mgr.remote-data-cache-total-bytes
> impala-server.io-mgr.remote-data-cache-dropped-byte{noformat}
> There are several questions that these metrics will not answer, especially when we start to consider changes to eviction algorithms. Here are some questions that we may want to be able to answer:
>  # How much memory is being used to track metadata?
>  # What is the distribution of size of entries in the cache?
>  # How many entries are in the cache?
>  # What are the hit/miss counts (as opposed to the hit bytes)?
>  # What is the actual disk usage (as seen by the OS)?
> This is an epic to track adding metrics to answer these questions (and other similar questions).



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