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https://issues.apache.org/jira/browse/HIVE-7219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14031324#comment-14031324
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Gopal V commented on HIVE-7219:
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Posted comments about config options, but that is from a documentation & user
configuration angle.
Doing a 1Tb insert with this patch in a few minutes, will measure perf at scale.
+1 (NB)
> Improve performance of serialization utils in ORC
> -------------------------------------------------
>
> Key: HIVE-7219
> URL: https://issues.apache.org/jira/browse/HIVE-7219
> Project: Hive
> Issue Type: Improvement
> Components: File Formats
> Affects Versions: 0.14.0
> Reporter: Prasanth J
> Assignee: Prasanth J
> Attachments: HIVE-7219.1.patch, HIVE-7219.2.patch, HIVE-7219.3.patch,
> orc-read-perf-jmh-benchmark.png
>
>
> ORC uses serialization utils heavily for reading and writing data. The
> bitpacking and unpacking code in writeInts() and readInts() can be unrolled
> for better performance. Also double reader/writer performance can be improved
> by bulk reading/writing from/to byte array.
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