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https://issues.apache.org/jira/browse/YARN-1303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13794496#comment-13794496
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Xuan Gong commented on YARN-1303:
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We can do something like this : deprecate shell_args, we set --shell_commad
with command and args. Also, we only support one --shell_command, if the client
set more than one --shell_command, we can output a message and say something
like this :"We do not support multiple shell_command options, you can create a
shell script with multiple shell commands, and use --shell_script. OR you can
combine all the shell_commands together, separate with ';' and use only one
--shell_command". (Should do the similar thing with shell_script, support only
one shell_script option). Also we may use '\' to escape the special characters
(such as ';' and '|'). In that case, the script running for ApplicationMaster
will become something like "--shell_command c1 arg1 arg2 \; c2 arg3 arg4". At
applicationMaster code, we try to separate the commands if there is any ';'. In
that case, the script in each container will become something like "c1 arg1
arg2 1>stdout 2>stderror", and "c2 arg3 arg4 1>>stdout 2>>stderror". We
separate the commands.
> 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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