Sergey Shelukhin created HIVE-10092:
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Summary: LLAP: improve how buffers are locked for split
Key: HIVE-10092
URL: https://issues.apache.org/jira/browse/HIVE-10092
Project: Hive
Issue Type: Sub-task
Reporter: Sergey Shelukhin
Right now, for simplicity, entire split of decompressed buffers is locked in
cache, in case some buffers are shared between RGs, to avoid dealing with
situations where we uncompress some data, pass it on to processor for RG N,
then processor processes and unlocks it, and before we can pass it on for RG
N+1 it's evicted.
However, if split is too big, and cache is small, or many splits are processed
at the same time, this can result in a deadlock as entire cache is locked. We
need to improve locking to be more granular and probably also try to avoid
deadlocks in general (bypass cache?)
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