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https://issues.apache.org/jira/browse/IMPALA-11905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17691865#comment-17691865
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David Rorke commented on IMPALA-11905:
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It might make sense to have a similar direct IO option for scratch/spill.
> Add an option to use direct IO for the data cache
> -------------------------------------------------
>
> Key: IMPALA-11905
> URL: https://issues.apache.org/jira/browse/IMPALA-11905
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 4.3.0
> Reporter: Joe McDonnell
> Priority: Major
>
> The data cache typically makes use of fast SSDs for storage. Given how fast
> those SSDs are, it may be better to do direct IO rather than going through
> the OS buffer cache. Excessive traffic through the OS buffer cache can create
> memory pressure and performance issues. We should add a startup option to use
> direct IO (i.e. O_DIRECT when opening the file) and test performance.
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