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https://issues.apache.org/jira/browse/HADOOP-2897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sameer Paranjpye reassigned HADOOP-2897:
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Assignee: Hemanth Yamijala
> [HOD] Remove script option from the core hod framework
> ------------------------------------------------------
>
> Key: HADOOP-2897
> URL: https://issues.apache.org/jira/browse/HADOOP-2897
> Project: Hadoop Core
> Issue Type: Improvement
> Components: contrib/hod
> Affects Versions: 0.16.0
> Reporter: Hemanth Yamijala
> Assignee: Hemanth Yamijala
> Fix For: 0.16.1
>
>
> Hod currently allows the user to specify and run a hadoop script after
> allocation, and deallocating as soon as the script is done. For e.g.
> hod -m 3 -z ~/hadoop.script
> allocates 3 nodes, and runs ~/hadoop.script, then deallocates
> This is a convenient way single line wrapper around 4-5 commands that users
> have to write themselves. We have this because:
> - hod 0.3 does not provide an easy way to combine these into a single
> operation, because of the HOD shell.
> - even in hod 0.4, users have to carefully write some error checking code to
> make sure their cluster is allocated successfully, before running the script
> and their HADOOP_CONF_DIR should be set correctly.
> - users can free up clusters as soon as they are done.
> The requirements make sense. But having this as part of the core hod
> interface seems incorrect. The interface should be an orthogonal set of
> commands that each just do one thing well. The script option should be
> converted to a simple wrapper that can be part of the hod project. This way,
> users can enjoy the benefits of not having to write such a script themselves,
> while the hod codebase can still be clean.
> One disadvantage if we change this is that users will need to remember one
> more command. But given hod 0.4 is a new interface anyway, it is better to
> address now, rather than later. And we can alleviate this a bit by making
> sure options are consistently named between hod and the wrapper script.
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