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https://issues.apache.org/jira/browse/HIVE-502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711948#action_12711948
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Zheng Shao commented on HIVE-502:
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In the future if needed, we can add synchronized keyword to RCFile's read/write
methods.
These methods will be called once per row, so the cost is much smaller than
what we had - once per row per column.
> 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
> 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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