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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7110) Implement chmod with JNI
Date Wed, 19 Jan 2011 00:08:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12983453#action_12983453

Todd Lipcon commented on HADOOP-7110:

Ran tests with compile.native=1 and without compile.native, both passed (except for HADOOP-7111

I'll commit this this evening.

> Implement chmod with JNI
> ------------------------
>                 Key: HADOOP-7110
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7110
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io, native
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.22.0
>         Attachments: hadoop-7110.txt
> MapReduce is currently using a race-prone workaround to approximate chmod() because forking
chmod is too expensive. This race is causing build failures (and probably task failures too).
We should implement chmod in the NativeIO library so we can have good performance (ie not
fork) and still not be prone to races.

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