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From "Gunther Hagleitner (JIRA)" <>
Subject [jira] [Commented] (HIVE-7219) Improve performance of serialization utils in ORC
Date Mon, 16 Jun 2014 03:20:01 GMT


Gunther Hagleitner commented on HIVE-7219:

These failures look related to the patch (at least some of them). Looked at orc_analyze: Need
to update golden files with new sizes. orc_split_elimination: Seems the order of records has
changed in some queries, not sure how this patch causes it, but should take a look.

> Improve performance of serialization utils in ORC
> -------------------------------------------------
>                 Key: HIVE-7219
>                 URL:
>             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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