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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4712) New libhdfs method hdfsGetDataNodes
Date Tue, 23 Apr 2013 19:09:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13639425#comment-13639425
] 

Colin Patrick McCabe commented on HDFS-4712:
--------------------------------------------

Hi Andrea,

I think {{datanodeReport}} is the method you want, much better than my earlier suggestion.

If I am interpreting correctly, you say you are creating your own {{DFSClient}}.  It shouldn't
be necessary for you to do that, since there should already be one of those that you can get
from the existing {{FileSystem}}.

I don't think that the requirement for superuser privileges is a problem.  Just set {{errno}}
to {{EPERM}} if the user doesn't have the correct permissions.  The requirement to be superuser
here is deliberate, and we don't want to open a security hole.

Please do attach the code; that's the first step towards getting it included in HDFS.  You
can also click "submit patch" to get JIRA results on it.
                
> New libhdfs method hdfsGetDataNodes
> -----------------------------------
>
>                 Key: HDFS-4712
>                 URL: https://issues.apache.org/jira/browse/HDFS-4712
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: libhdfs
>            Reporter: andrea manzi
>
> we have implemented a possible extension to libhdfs to retrieve information about the
available datanodes ( there was a mail on the hadoop-hdsf-dev mailing list initially abut
this :
> http://mail-archives.apache.org/mod_mbox/hadoop-hdfs-dev/201204.mbox/%3CCANhO-
> s0mvORORrxPjnjbQL6bRkJ4C7L+u816xkdc+2r0WHjBcw@mail.gmail.com%3E)
> i would like to know how to proceed to create a patch, cause on the wiki http://wiki.apache.org/hadoop/HowToContribute
i can see info about JAVA patches but nothing related to extensions in C.

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