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https://issues.apache.org/jira/browse/HIVE-17994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16299153#comment-16299153
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Matt McCline commented on HIVE-17994:
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Thank you [~teddy.choi] for your review and [~gopalv] for your help.
> Vectorization: Serialization bottlenecked on irrelevant hashmap lookup
> ----------------------------------------------------------------------
>
> Key: HIVE-17994
> URL: https://issues.apache.org/jira/browse/HIVE-17994
> Project: Hive
> Issue Type: Bug
> Reporter: Gopal V
> Assignee: Matt McCline
> Priority: Minor
> Attachments: HIVE-17994.01.patch, HIVE-17994.02.patch,
> HIVE-17994.03.patch, HIVE-17994.04.patch, HIVE-17994.05.patch,
> HIVE-17994.06.patch, vec-serialize-hashmap.png
>
>
> On machines with slower NUMA, the hashmap lookup for
> TypeInfo::getPrimitiveCategory is the slowest part of the vectorized
> serialization loops. The static object references run hot with the NUMA
> access speeds penalizing half the threads.
> This lookup is done for every column, for every row - though vectorization
> enforces that this type cannot change at all.
> !vec-serialize-hashmap.png!
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