Joe McDonnell created IMPALA-9475:
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Summary: Track size of metadata usage for data cache
Key: IMPALA-9475
URL: https://issues.apache.org/jira/browse/IMPALA-9475
Project: IMPALA
Issue Type: Improvement
Components: Backend
Affects Versions: Impala 3.4.0
Reporter: Joe McDonnell
Currently, the memory used to track metadata for the data cache is untracked.
When comparing cache eviction algorithms (or just monitoring the cache), the
metadata size is a useful metric for comparison.
The cache implementation contains a kudu MemTracker ([
https://github.com/apache/impala/blob/master/be/src/util/cache/cache.cc#L154
).|https://github.com/apache/impala/blob/master/be/src/util/cache/cache.cc#L154).]
This MemTracker does not integrate with Impala's MemTracker hierarchy, and it
tracks the usage in the cache (not the metadata size). This should be modified
to track metadata size and integrate with Impala's MemTracker hierarchy.
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