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Posted to dev@hive.apache.org by "Oliver Draese (JIRA)" <ji...@apache.org> on 2019/03/11 13:27:01 UTC

[jira] [Created] (HIVE-21422) Add metrics to LRFU cache policy

Oliver Draese created HIVE-21422:
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             Summary: Add metrics to LRFU cache policy
                 Key: HIVE-21422
                 URL: https://issues.apache.org/jira/browse/HIVE-21422
             Project: Hive
          Issue Type: Improvement
          Components: llap
    Affects Versions: 4.0.0
            Reporter: Oliver Draese
            Assignee: Oliver Draese
             Fix For: 4.0.0


The LRFU cache policy for the LLAP data cache doesn't  provide enough insight to figure out, what is cached and why something might get evicted. This ticket is used to add Hadoop metrics 2 information (accessible via JMX) to the LRFU policy, providing following information:
 * How much memory is cached for data buffers
 * How much memory is cached for meta data buffers
 * How large is the min-heap of the cache policy
 * How long is the eviction short list (linked list)
 * How much memory is currently "locked" (buffers with positive reference count) and therefore in use by a query

These new counters are found in the MX bean, following this path:

Hadoop/LlapDaemon/LowLevelLrfuCachePolicy-<hostname>

 



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