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