Joe McDonnell created IMPALA-9435:
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Summary: Usability enhancements for the data cache access trace
Key: IMPALA-9435
URL: https://issues.apache.org/jira/browse/IMPALA-9435
Project: IMPALA
Issue Type: Improvement
Components: Backend
Affects Versions: Impala 3.4.0
Reporter: Joe McDonnell
Assignee: Joe McDonnell
In IMPALA-8542, we added an access trace to the data cache. This outputs a JSON
entry with information about each hit/miss. Currently it is controlled by the
data_cache_enable_tracing startup parameter, and it will trace all accesses to
a single file. There are a few enhancements that would make this easier to
enable:
# Limit the number of access trace entries stored on disk to avoid unlimited
disk usage. This can be done by switching to use be/src/util/simple-logger.h
rather than a single file. The number of retained entries should be
configurable.
# Implement a way to trace a subset of accesses (e.g. 5%)
# Optionally provide a way to start/stop logging without restart (e.g. via the
WebUI)
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