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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-266) Improve SerDe performance by using Text instead of String
Date Mon, 02 Feb 2009 05:55:59 GMT
Improve SerDe performance by using Text instead of String
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                 Key: HIVE-266
                 URL: https://issues.apache.org/jira/browse/HIVE-266
             Project: Hadoop Hive
          Issue Type: Improvement
          Components: Serializers/Deserializers
    Affects Versions: 0.2.0
            Reporter: Zheng Shao
            Priority: Critical


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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