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https://issues.apache.org/jira/browse/YARN-1303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13794498#comment-13794498
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Xuan Gong commented on YARN-1303:
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Or we can do : still support --shell_args, and multiple --shell_command. We
introduce --shell_args_num to help us track which args belong to which command.
So, if we want to run echo Yarn Hadoop Mapreduce and pwd, so this will become
--shell_command echo --shell_args Yarn Hadoop Mapreduce --shell_args_num 3
--shell_command pwd --shell_args_number 0. In this case, we will know the
command echo has three args, and pwd does not have any command. For the script
running for ApplicationMaster, we will get something like "--shell_command
echo,pwd --shell_args Yarn,Hadoop,Mapreduce --shell_args_num 3,0". In
ApplicationMaster code, we need recover those commands back. And run multiple
commands separately. We do the similar thing for shell_script.
> Allow multiple commands separating with ;
> -----------------------------------------
>
> Key: YARN-1303
> URL: https://issues.apache.org/jira/browse/YARN-1303
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: applications/distributed-shell
> Reporter: Tassapol Athiapinya
> Assignee: Xuan Gong
> Fix For: 2.2.1
>
>
> In shell, we can do "ls; ls" to run 2 commands at once.
> In distributed shell, this is not working. We should improve to allow this to
> occur. There are practical use cases that I know of to run multiple commands
> or to set environment variables before a command.
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