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Posted to common-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2016/03/17 14:11:33 UTC
[jira] [Commented] (HADOOP-12930) [Umbrella] Dynamic subcommands
for hadoop shell scripts
[ https://issues.apache.org/jira/browse/HADOOP-12930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15199481#comment-15199481 ]
Allen Wittenauer commented on HADOOP-12930:
-------------------------------------------
It is extremely desirable to be able to add subcommands to the hadoop, etc, commands dynamically. There are several reasons to do this:
* Enable local variants of subcommands without worrying about breaking existing scripts. For example, distcp has historically been replaced with local versions for various reasons.
* Allows for greater testing capabilities
* Possibility of 3rd party/external-to-hadoop being allowed to add capabilities and take advantage of the rich shell environment
In order to accomplish this, a few things need to take place:
* make some shell-local globals to be 'safe' globals that can span past their borders
* define an API by which 3rd parties may add and override existing commands
* get HADOOP-12857 committed for some pre-work
> [Umbrella] Dynamic subcommands for hadoop shell scripts
> -------------------------------------------------------
>
> Key: HADOOP-12930
> URL: https://issues.apache.org/jira/browse/HADOOP-12930
> Project: Hadoop Common
> Issue Type: Bug
> Components: scripts
> Affects Versions: 3.0.0
> Reporter: Allen Wittenauer
> Assignee: Allen Wittenauer
>
> Umbrella for converting hadoop, hdfs, mapred, and yarn to allow for dynamic subcommands. See first comment for more details.
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