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Posted to dev@hive.apache.org by "Zheng Shao (JIRA)" <ji...@apache.org> on 2009/05/22 06:55:45 UTC

[jira] Assigned: (HIVE-502) Optimize RCFile's performance by removeing all synchronized modifiers

     [ https://issues.apache.org/jira/browse/HIVE-502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zheng Shao reassigned HIVE-502:
-------------------------------

    Assignee: He Yongqiang

> Optimize RCFile's performance by removeing all synchronized modifiers
> ---------------------------------------------------------------------
>
>                 Key: HIVE-502
>                 URL: https://issues.apache.org/jira/browse/HIVE-502
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: He Yongqiang
>            Assignee: He Yongqiang
>         Attachments: hive-502-2009-05-21.patch
>
>
> Tests by Zheng and me both show that removing all synchronized modifiers can improve RCFile's performance by  about 15+%.
> This will make RCFile's reader and writer not thread safe any longer. This will be ok,since hive always does its work in single thread.

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