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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1915) ClientToAMTokenMasterKey should be provided to AM at launch time
Date Wed, 22 Oct 2014 02:12:34 GMT

    [ https://issues.apache.org/jira/browse/YARN-1915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14179479#comment-14179479
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Jian He commented on YARN-1915:
-------------------------------

bq. However there's some confusion as to how the client token master key should be sent to
the RM (e.g.: via container credentials, via the current method, etc.)
thanks Jason, I read through the discussion. I prefer setting via container credential as
it's the common way to pass the credential/tokens to both AM container and non-AM container.
 I'm also OK to get the current patch in first.

> ClientToAMTokenMasterKey should be provided to AM at launch time
> ----------------------------------------------------------------
>
>                 Key: YARN-1915
>                 URL: https://issues.apache.org/jira/browse/YARN-1915
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.2.0
>            Reporter: Hitesh Shah
>            Assignee: Jason Lowe
>            Priority: Blocker
>         Attachments: YARN-1915.patch, YARN-1915v2.patch, YARN-1915v3.patch
>
>
> Currently, the AM receives the key as part of registration. This introduces a race where
a client can connect to the AM when the AM has not received the key. 
> Current Flow:
> 1) AM needs to start the client listening service in order to get host:port and send
it to the RM as part of registration
> 2) RM gets the port info in register() and transitions the app to RUNNING. Responds back
with client secret to AM.
> 3) User asks RM for client token. Gets it and pings the AM. AM hasn't received client
secret from RM and so RPC itself rejects the request.



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