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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-8569) Create an interface to provide cluster information to application
Date Fri, 31 Aug 2018 01:46:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-8569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Yang updated YARN-8569:
----------------------------
    Attachment: YARN-8569 YARN sysfs interface to provide cluster information to application.pdf

> Create an interface to provide cluster information to application
> -----------------------------------------------------------------
>
>                 Key: YARN-8569
>                 URL: https://issues.apache.org/jira/browse/YARN-8569
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>            Priority: Major
>              Labels: Docker
>         Attachments: YARN-8569 YARN sysfs interface to provide cluster information to
application.pdf, YARN-8569.001.patch, YARN-8569.002.patch, YARN-8569.003.patch, YARN-8569.004.patch
>
>
> Some program requires container hostnames to be known for application to run.  For example,
distributed tensorflow requires launch_command that looks like:
> {code}
> # On ps0.example.com:
> $ python trainer.py \
>      --ps_hosts=ps0.example.com:2222,ps1.example.com:2222 \
>      --worker_hosts=worker0.example.com:2222,worker1.example.com:2222 \
>      --job_name=ps --task_index=0
> # On ps1.example.com:
> $ python trainer.py \
>      --ps_hosts=ps0.example.com:2222,ps1.example.com:2222 \
>      --worker_hosts=worker0.example.com:2222,worker1.example.com:2222 \
>      --job_name=ps --task_index=1
> # On worker0.example.com:
> $ python trainer.py \
>      --ps_hosts=ps0.example.com:2222,ps1.example.com:2222 \
>      --worker_hosts=worker0.example.com:2222,worker1.example.com:2222 \
>      --job_name=worker --task_index=0
> # On worker1.example.com:
> $ python trainer.py \
>      --ps_hosts=ps0.example.com:2222,ps1.example.com:2222 \
>      --worker_hosts=worker0.example.com:2222,worker1.example.com:2222 \
>      --job_name=worker --task_index=1
> {code}
> This is a bit cumbersome to orchestrate via Distributed Shell, or YARN services launch_command.
 In addition, the dynamic parameters do not work with YARN flex command.  This is the classic
pain point for application developer attempt to automate system environment settings as parameter
to end user application.
> It would be great if YARN Docker integration can provide a simple option to expose hostnames
of the yarn service via a mounted file.  The file content gets updated when flex command is
performed.  This allows application developer to consume system environment settings via a
standard interface.  It is like /proc/devices for Linux, but for Hadoop.  This may involve
updating a file in distributed cache, and allow mounting of the file via container-executor.



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