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https://issues.apache.org/jira/browse/HADOOP-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12666555#action_12666555
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Luca Telloli commented on HADOOP-414:
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My vote also on this issue. From some profiling I did, it looks like the
NameNode is spending 2% of the CPU time on UTF8, and it could save about 40% of
it by using Text.
> replace class UTF8 with class Text
> ----------------------------------
>
> Key: HADOOP-414
> URL: https://issues.apache.org/jira/browse/HADOOP-414
> Project: Hadoop Core
> Issue Type: Improvement
> Components: io
> Affects Versions: 0.5.0
> Reporter: Hairong Kuang
> Assignee: Owen O'Malley
> Attachments: utf2text.patch
>
>
> Since class UTF8 is deprecated, all references of UTF8 in hadoop should be
> replaced with class Text if the change does not break the system.
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