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From "Hitesh Shah (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1915) ClientToAMTokenMasterKey should be provided to AM at launch time
Date Wed, 13 Aug 2014 16:32:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-1915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14095671#comment-14095671
] 

Hitesh Shah commented on YARN-1915:
-----------------------------------

[~jlowe] [~daryn] Was there a reason for not sending in the secret to the AM via its env when
it launches? I am assuming this is to not have all the AMs to change to handle this? Wouldn't
that be a more effective solution as compared to use of a timer ( which in practice would
work ) but is still reliant upon the AM receiving the secret from the RM within the time window
before the client does.  

> 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: Critical
>         Attachments: YARN-1915.patch, YARN-1915v2.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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