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Posted to common-issues@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2011/01/18 18:35:44 UTC

[jira] Updated: (HADOOP-7110) Implement chmod with JNI

     [ https://issues.apache.org/jira/browse/HADOOP-7110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HADOOP-7110:
--------------------------------

    Attachment: hadoop-7110.txt

> 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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