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https://issues.apache.org/jira/browse/YARN-7286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16198880#comment-16198880
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Jason Lowe commented on YARN-7286:
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Yeah, the core problem with trying to use empty as a value was YARN-4258 set a
precedence for the default value to be
DEFAULT_NM_DOCKER_CONTAINER_CAPABILITIES, a significant list of capabilites by
default. The closest we could get is to leave the default in yarn-default.xml
to be the current list in DEFAULT_NM_DOCKER_CONTAINER_CAPABILITIES but treat an
empty/unset property as no capability. That would technically be incompatible
with the behavior in YARN-4258, and users would still have to explicitly unset
the property or set it to an empty string to get nothing rather than getting
nothing by default. However I think it's probably rare for someone to be
explicitly unsetting this property today or setting it to an empty string and
expecting the large list of capabilities in
DEFAULT_NM_DOCKER_CONTAINER_CAPABILITIES to be picked up. Pinging
[~sidharta-s] and [~vvasudev] since they worked on YARN-4258 and may have
opinions on how best to allow no capabilities to be set.
If we decide to keep with the "none" approach, given other properties can be
specified case-insensitive, I think it would be consistent to allow either
"none" or "NONE" as a value.
> Add support for docker to have no capabilities
> ----------------------------------------------
>
> Key: YARN-7286
> URL: https://issues.apache.org/jira/browse/YARN-7286
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: yarn
> Reporter: Eric Badger
> Assignee: Eric Badger
> Attachments: YARN-7286.001.patch, YARN-7286.002.patch,
> YARN-7286.003.patch
>
>
> Support for controlling capabilities was introduced in YARN-4258. However, it
> does not allow for the capabilities list to be NULL, since {{getStrings()}}
> will treat an empty value the same as it treats an unset property. So, a NULL
> list will actually give the default capabilities list.
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