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From "Ashish Thusoo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-266) Improve SerDe performance by using Text instead of String
Date Tue, 14 Apr 2009 02:26:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698627#action_12698627

Ashish Thusoo commented on HIVE-266:

I looked at the UDAF evaluator stuff and the UDF changes. They look fine to me. So +1 from
my side. Though we should think of ways in which the UDAF does not need to create a sub class
for the evaluator. Will run the tests and checkin if all the tests pass on trunk.

> 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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