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Posted to issues-all@impala.apache.org by "Peter Ebert (Jira)" <ji...@apache.org> on 2021/07/23 17:23:00 UTC
[jira] [Created] (IMPALA-10824) Persist Remote Read Cache when
Restarting Impala Executors
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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