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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4546) Minor fix in dfs to make hadoop work in AIX
Date Mon, 02 Mar 2009 20:10:56 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678079#action_12678079
] 

Chris Douglas commented on HADOOP-4546:
---------------------------------------

bq. I don't see any reason why this can't be included in 0.18.4 as the original code that
is patched has not been changed over the last few releases.

That's not one of the criteria Hadoop uses to determine whether a patch should be backported.
That the code is stable is an argument _against_ backporting this for two reasons. First,
there are no known issues with it and any changes may destabilize it, requiring more maintenance
releases. Second, applying the patch isn't unduly burdensome, neither does it require any
special build instruction, so interested parties can apply this themselves. Hadoop's release
criteria are conservative, in part because most organizations want to backport some subset
of later releases into stable branches.

With few exceptions, the only patches that get pushed into older branches are those that fix
behavior that was unintentionally and incompatibly broken in that branch or earlier. If it
can be demonstrated that a previous version of Hadoop was compatible with AIX, then the patch
can be pushed into previous releases, but lacking that it requires a special dispensation.

> Minor fix in dfs to make hadoop work in AIX
> -------------------------------------------
>
>                 Key: HADOOP-4546
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4546
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.18.0, 0.19.0
>         Environment: AIX 
>            Reporter: Arun Venugopal
>            Assignee: Bill Habermaas
>             Fix For: 0.21.0
>
>         Attachments: 4546-1.patch, 4546-2.patch, dfs_aix_fix.patch, hadoop-4546.patch,
TestDFVariations.java
>
>
> HDFS uses df command to get the disk space. The output format of df command is different
in AIX compared to Linux and Solaris. Checking the OS type and then reading the df output
as per the format will fix this issue and thus allows hadoop to be fully functional in AIX
environment.

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