[
https://issues.apache.org/jira/browse/HIVE-266?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zheng Shao updated HIVE-266:
----------------------------
Hadoop Flags: [Incompatible change]
> 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: 0.2.0
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
