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From "Craig Condit (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-8624) Cleanup ENTRYPOINT documentation
Date Fri, 03 Aug 2018 13:40:00 GMT
Craig Condit created YARN-8624:

             Summary: Cleanup ENTRYPOINT documentation
                 Key: YARN-8624
                 URL: https://issues.apache.org/jira/browse/YARN-8624
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Craig Condit

With the changes to allow disabling the YARN launch script in favor of running whatever is
specified in the image, I think the following needs to be remove/updated. There is already
a section called Docker Container ENTRYPOINT support. I think we can clean this up a bit make
it easier to understand this feature. Given the need to explain YARN's existing launching
logic, this also may be best for a follow on ticket as it will require some testing to fully
describe the feature.
If a Docker image has a command set, the behavior will depend on whether the YARN_CONTAINER_RUNTIME_DOCKER_RUN_OVERRIDE_DISABLE
is set to true. If so, the command will be overridden when LCE launches the image with YARN's
container launch script. 
 If a Docker image has an entry point set, the entry point will be honored, but the default
command may be overridden, as just mentioned above. Unless the entry point is something similar
to sh -c or YARN_CONTAINER_RUNTIME_DOCKER_RUN_OVERRIDE_DISABLE is set to true, the net result
will likely be undesirable. Because the YARN container launch script is required to correctly
launch the YARN task, use of entry points is discouraged. {code}

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