Craig Condit created YARN-8624:
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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.
{code:java}
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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