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https://issues.apache.org/jira/browse/YARN-8675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592173#comment-16592173
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Billie Rinaldi commented on YARN-8675:
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Hey [~Jim_Brennan], thanks for taking a look. You're right, that javadoc should
be updated. Regarding the case where net=host and the hostname is set by the
AM, this works successfully for the service AM because it creates registry
entries for this hostname. This is why I suggested changing the net=host
behavior only for AMs that do not set the hostname. The issues we have
encountered in this ticket and YARN-8027 regarding net=host have been about the
default hostname based on the contaner ID that is created in the docker runtime
when the AM has not provided a hostname. The issues should be resolved by not
setting the default hostname when net=host, as in patch 2.
> Setting hostname of docker container breaks with "host" networking mode for
> Apps which do not run as a YARN service
> -------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-8675
> URL: https://issues.apache.org/jira/browse/YARN-8675
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Yesha Vora
> Assignee: Suma Shivaprasad
> Priority: Major
> Labels: Docker
> Attachments: YARN-8675.1.patch, YARN-8675.2.patch
>
>
> Applications like the Spark AM currently do not run as a YARN service and
> setting hostname breaks driver/executor communication if docker version
> >=1.13.1 , especially with wire-encryption turned on.
> YARN-8027 sets the hostname if YARN DNS is enabled. But the cluster could
> have a mix of YARN service/native Applications.
> The proposal is to not set the hostname when "host" networking mode is
> enabled.
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