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https://issues.apache.org/jira/browse/YARN-6655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16026824#comment-16026824
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Allen Wittenauer commented on YARN-6655:
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bq. label (node delimited by a dot in the hostname) is limited to 63 characters
I'm not sure if this is correct. It's very possible to have:
@ example.com
foo.bar IN A 0.0.0.0
in DNS. foo.bar would the label for a node in example.com. In particular, RFC
1143 says:
"Host software MUST handle host names of up to 63 characters and SHOULD handle
host names of up to 255 characters."
If a site isn't using DNS (e.g., /etc/hosts, NIS+, or some other naming
service), enforcing DNS restrictions comes across as somewhat arbitrary given
RFC 1143.
So I'm inclined to think that this should be a configurable limit, up to 255
chars.
> We should validate yarn native services application submission side to
> ensure that the hostname should be less than 63 characters
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-6655
> URL: https://issues.apache.org/jira/browse/YARN-6655
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: yarn-native-services
> Affects Versions: yarn-native-services
> Reporter: Karam Singh
> Assignee: Billie Rinaldi
> Fix For: yarn-native-services
>
> Attachments: YARN-6655-yarn-native-services.001.patch
>
>
> According to RFC 1035 the length of a FQDN is limited to 255 characters, and
> each label (node delimited by a dot in the hostname) is limited to 63
> characters
> So We should validate yarn native services application submission side to
> ensure that the hostname should be less than 63 characters
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