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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10962) Flags for posix_fadvise are not valid in some architectures
Date Tue, 12 Aug 2014 20:34:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14094619#comment-14094619
] 

Colin Patrick McCabe commented on HADOOP-10962:
-----------------------------------------------

+1 pending jenkins.

Thanks, David

> Flags for posix_fadvise are not valid in some architectures
> -----------------------------------------------------------
>
>                 Key: HADOOP-10962
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10962
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: native
>    Affects Versions: 2.4.1
>         Environment: System z/Linux
>            Reporter: David Villegas
>         Attachments: HADOOP-10962.patch
>
>
> In org.apache.hadoop.io.nativeio.NativeIO.java, the posix_fadvise flag parameter is hardcoded
to the most common values in fcntl.h.
> However, not all architectures use the same values (in this case, System z/Linux) A better
approach would be to not make assumptions about fcntl.h values (or any other system constants).
> This bug results in calls to posix_fadvise failing in zLinux.



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