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https://issues.apache.org/jira/browse/HIVE-7219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14091875#comment-14091875
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Lefty Leverenz commented on HIVE-7219:
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Configuration parameter *hive.exec.orc.encoding.strategy* is documented in the
wiki here for release 0.14.0:
* [Configuration Properties -- hive.exec.orc.encoding.strategy |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.exec.orc.encoding.strategy]
> 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
> Fix For: 0.14.0
>
> Attachments: HIVE-7219.1.patch, HIVE-7219.2.patch, HIVE-7219.3.patch,
> HIVE-7219.4.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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