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From "Panagiotis Garefalakis (Jira)" <>
Subject [jira] [Updated] (HIVE-23166) Guard VGB from flushing too often
Date Thu, 09 Apr 2020 15:33:00 GMT


Panagiotis Garefalakis updated HIVE-23166:
    Summary: Guard VGB from flushing too often  (was: Protect VGB from flushing too often)

> Guard VGB from flushing too often
> ---------------------------------
>                 Key: HIVE-23166
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: llap
>    Affects Versions: 4.0.0
>            Reporter: Panagiotis Garefalakis
>            Assignee: Panagiotis Garefalakis
>            Priority: Major
> The existing flush logic in our VectorGroupByOperator is completely static.
>  It depends on the: number of HtEntries (*hive.vectorized.groupby.maxentries*) and the
MAX memory threshold (by default 90% of available memory)
> Assuming that we are not memory constrained the periodicity of flushing is currently
dictated by the static number of entries (1M by default) which can be also misconfigured to
a very low value.
> I am proposing along with maxHtEntries, to also take into account current memory usage,
to avoid flushing too ofter as it can hurt op throughput for particular workloads.

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