[jira] Commented: (HADOOP-3145) HOD command should allow to allow to specify a hadoop command in the command line

["Hemanth Yamijala (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12586475#action_12586475 ] 

Hemanth Yamijala commented on HADOOP-3145:
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We could do something like:

hod script -d cluster-dir -n nodes --hod.cmd "hadoop jar hadoop-examples.jar wordcount input output"

OR

hod cmd -d cluster-dir -n nodes --hod.cmd "hadoop jar hadoop-examples.jar wordcount input output"

Preferences / alternate suggestions ?

One thing to think about is which hadoop we will use. I propose we just pick what's in the path, and let the user set it up correctly. In some setups, admins set up the path for the users, so the above example would just work. If a tarball is being used, the user has to untar the tarball somewhere and set the path correctly.

Alternatively, she can always define: 

hod script -d cluster-dir -n nodes --hod.cmd "/foo/bar/hadoop jar hadoop-examples.jar wordcount input output"

More generically - we don't interpret anything inside hod.cmd, but pass it as such to the shell. 

Another thing to note is the quotes around the hadoop command. I can't think of any better way than this to specify a sub-command, without keeping from getting into positional arguments . So, in the above example, one could also say:

hod script --hod.cmd "/foo/bar/hadoop..." -d cluster-dir -n nodes

Again, alternate suggestions welcome.

> HOD command should allow to allow to specify a hadoop command in the command line
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-3145
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3145
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/hod
>    Affects Versions: 0.16.0
>            Reporter: Arkady Borkovsky
>            Assignee: Vinod Kumar Vavilapalli
>             Fix For: 0.16.3
>
>
> The current version allows only to specify a "script".
> So if one needs to generate a single command, one has to create a file for this, which very inconvenient -- generating temp file name, printing, deleting the file.
> It also incompatible with hod 0.3

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