Peter Ebert created IMPALA-10824:
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Summary: Persist Remote Read Cache when Restarting Impala Executors
Key: IMPALA-10824
URL: https://issues.apache.org/jira/browse/IMPALA-10824
Project: IMPALA
Issue Type: Improvement
Reporter: Peter Ebert
Currently impala executors will delete the remote read cache at startup. For
users dependent on a warm cache for good performance, a restart might be needed
to change a setting or fix an issue, which would then clear the cache, make
queries slower, and hit the network. If Impala instead wrote out the cache
metadata on shutdown, and loaded on startup, this would keep the cache warm and
not slow down subsequent queries.
I would envision this just for intentional shutdown/restarts, not unexpected
failures/stops where consistency of the metadata would be difficult or
impossible to maintain. When loading on startup if any inconsistencies were
found aborting and deleting the cache would be understandable.
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