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https://issues.apache.org/jira/browse/IMPALA-7475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong reassigned IMPALA-7475:
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Assignee: (was: Tim Armstrong)
> Explicitly document perf consequences of setting mem_limit
> ----------------------------------------------------------
>
> Key: IMPALA-7475
> URL: https://issues.apache.org/jira/browse/IMPALA-7475
> Project: IMPALA
> Issue Type: Improvement
> Components: Docs
> Reporter: Tim Armstrong
> Priority: Major
>
> There are a few significant bits of information that the docs don't really
> explicitly mention.
> * In the mem_limit docs, we don't mention that Impala will employ various
> strategies to keep the query's memory consumption under the mem_limit that
> trade off execution speed for reduced memory consumption.
> * Spill-to-disk is one such mechanism but we do other things like reducing
> number of scanner threads and passing through rows from preaggregations.
> [~arodoni_cloudera] is there a good place in the docs to add something like
> this? I could draft something but not sure exactly where it would fit.
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