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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-266) Improve SerDe performance by using Text instead of String
Date Mon, 13 Apr 2009 22:13:14 GMT

     [ https://issues.apache.org/jira/browse/HIVE-266?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zheng Shao updated HIVE-266:
----------------------------

    Attachment: HIVE-266.6.patch

Make the code backward compatible with existing UDF classes that uses Java primitive types.
Added a test case for that.


> Improve SerDe performance by using Text instead of String
> ---------------------------------------------------------
>
>                 Key: HIVE-266
>                 URL: https://issues.apache.org/jira/browse/HIVE-266
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Serializers/Deserializers
>    Affects Versions: 0.4.0
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>            Priority: Critical
>             Fix For: 0.4.0
>
>         Attachments: HIVE-266.1.patch, HIVE-266.2.patch, HIVE-266.3.patch, HIVE-266.4.patch,
HIVE-266.5.patch, HIVE-266.6.patch
>
>
> A recent performance study showed that 2 places in Hive code has exhibited large cpu
usage percentage:
> 1. String.getBytes() (UTF-8 encoding)
> 2. String.split()
> We should replace String with Text object to:
> 1. Avoid UTF-8 decoding and encoding
> 2. Reuse the Text object and avoid creating new objects for each column in each row like
in String.split()
> This is expected to give a big (20%+) performance improvement to Hive.

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