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https://issues.apache.org/jira/browse/YARN-9160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16735285#comment-16735285
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Wangda Tan edited comment on YARN-9160 at 1/6/19 7:17 PM:
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Committed to trunk and branch-3.2, thanks [~tangzhankun].
was (Author: leftnoteasy):
Committed to trunk, thanks [~tangzhankun].
> [Submarine] Document "PYTHONPATH" environment variable setting when using
> -localization options
> -----------------------------------------------------------------------------------------------
>
> Key: YARN-9160
> URL: https://issues.apache.org/jira/browse/YARN-9160
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Zhankun Tang
> Assignee: Zhankun Tang
> Priority: Major
> Fix For: 3.3.0, 3.2.1
>
> Attachments: YARN-9160-trunk.001.patch
>
>
> An infra platform might want to provide the user a Zepplin notebook and
> execute user's job with user's command input like "python entry_point.py
> ...". This is better for the end user because he/she feels that the
> "entry_point.py" seems in the local workbench.
> This may translate to below submarine command in the platform when submitting
> the job:
>
> {code:java}
> ... job run
> --localization entry_script.py:./
> --localization depedency_script1.py:./
> --localization depedency_script2.py:./
> --worker_launch_cmd "python entry_point.py .."
> {code}
> Or
>
> {code:java}
> ... job run
> --localization entry_script.py:./
> --localization depedency_scripts_dir:./
> --worker_launch_cmd "python entry_script.py .."
> {code}
>
> When running with the above command, both will fail due to module import
> error from the entry_point.py. This is because YARN only creates symbol links
> in the container's work dir (the real scripts files are in different cache
> folders) and python module import won't know that.
> One possible solution is set localization with a directory containing all
> scripts and change the worker_launch_cmd to "cd scripts_dir && python
> entry_script.py". But this solution makes the user experience bad which feels
> not in a local workbench.
> And another solution is using "PYTHONPATH" environment variable. This
> solution can keep the user experience good and won't need YARN localization
> internal changes.
> {code:java}
> ... job run
> # the entry point
> --localization entry_script.py:<path>/entry_script.py
> # the dependency Python scripts of the entry point
> --localization depedency_scripts_dir:<path>/dependency_scripts_dir
> # the PYTHONPATH env to make dependency available to entry script
> --env PYTHONPATH="<path>/dependency_scripts_dir"
> --worker_launch_cmd "python <path>/entry_script.py ..."{code}
> And we should document this.
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