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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