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From "Craig Welch (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1994) Expose YARN/MR endpoints on multiple interfaces
Date Tue, 29 Jul 2014 20:04:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-1994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14078272#comment-14078272
] 

Craig Welch commented on YARN-1994:
-----------------------------------

Milan
At present multi-home only works if all interfaces on a box have the same names, managing
which address a client will connect to has to be managed by controlling what address this
will resolve to for a particular class of clients.  This is necessary because there are cases
where links and redirects are generated based on names, and for this to operate for all clients
on all networks the names for the hadoop hosts must be the same everywhere.  For it to work
in any other way would require logic to use a particular name depending on the source network
of the client when generating links, and that is not in the current scope (there would be
other complexity around managing multiple names for the same host/service as well, which would
be problematic).  Since the only way for multi-home to work properly at this point is for
the host to have the same name on all networks it can be accessed from the additional logic
is unnecessary - when properly configured, it will always return the same name.  The same
is true for the container manager impl, mrclient service, task attempt, etc

> Expose YARN/MR endpoints on multiple interfaces
> -----------------------------------------------
>
>                 Key: YARN-1994
>                 URL: https://issues.apache.org/jira/browse/YARN-1994
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager, resourcemanager, webapp
>    Affects Versions: 2.4.0
>            Reporter: Arpit Agarwal
>            Assignee: Craig Welch
>         Attachments: YARN-1994.0.patch, YARN-1994.1.patch, YARN-1994.11.patch, YARN-1994.11.patch,
YARN-1994.12.patch, YARN-1994.2.patch, YARN-1994.3.patch, YARN-1994.4.patch, YARN-1994.5.patch,
YARN-1994.6.patch, YARN-1994.7.patch
>
>
> YARN and MapReduce daemons currently do not support specifying a wildcard address for
the server endpoints. This prevents the endpoints from being accessible from all interfaces
on a multihomed machine.
> Note that if we do specify INADDR_ANY for any of the options, it will break clients as
they will attempt to connect to 0.0.0.0. We need a solution that allows specifying a hostname
or IP-address for clients while requesting wildcard bind for the servers.
> (List of endpoints is in a comment below)



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