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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6655) We should validate yarn native services application submission side to ensure that the hostname should be less than 63 characters
Date Fri, 26 May 2017 20:53:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-6655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16026824#comment-16026824
] 

Allen Wittenauer commented on YARN-6655:
----------------------------------------

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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