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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3418) AM to be able to set/update web URL and IPC ports post-registration
Date Fri, 11 Sep 2015 16:21:47 GMT

    [ https://issues.apache.org/jira/browse/YARN-3418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741067#comment-14741067

Steve Loughran commented on YARN-3418:

...catching up on this. I quite like the idea of reusing the same message.

# no new messages, protobuf pain...
# API is available to all apps built against Hadoop 2.2+ JARs: no linking problems

> AM to be able to set/update web URL and IPC ports post-registration
> -------------------------------------------------------------------
>                 Key: YARN-3418
>                 URL: https://issues.apache.org/jira/browse/YARN-3418
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Assignee: Rohith Sharma K S
> Currently the AM can only set the IPC and HTTP(s) ports on AM registration.
> This
> # creates a possible race condition: the IPC and HTTP ports need to come up before the
app is fully initialised. This is particularly true on work-preserving AM restarts, as the
AM will depend on the list of containers supplied during registration to build its internal
> # prevents the AM from changing these values dynamically during application execution.
This matters if the Web or IPC services are hosted not in the AM, but in a deployed container.
If the container is restarted, there's no way to rebind the services. 
> A new AM-RM IPC call to publish updated binding information is needed.

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