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From "Omkar Vinit Joshi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-674) Slow or failing DelegationToken renewals on submission itself make RM unavailable
Date Fri, 25 Oct 2013 00:19:02 GMT

    [ https://issues.apache.org/jira/browse/YARN-674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13804834#comment-13804834
] 

Omkar Vinit Joshi commented on YARN-674:
----------------------------------------

updating the patch
Modifying the event flow
* In unsecured case nothing will change
* In secured case
** For Recovery
*** ApplicationEvents will be enqueued when we are recovering. When service starts they will
get processed.
** For normal app submission
*** Event will be enqueued into the separate DelegationTokenRenewer dispatcher queue and client's
request will be returned immediately.
*** If the token renewal is successful then renewer will send the START/RECOVER event else
it will fail the app.

* Testing
** Updated unit test to test the updated behavior
** Manually tested it on secured cluster
*** tested app submission with by default HDFS TOKEN and it works.
*** tested same by restarting RM in between

> Slow or failing DelegationToken renewals on submission itself make RM unavailable
> ---------------------------------------------------------------------------------
>
>                 Key: YARN-674
>                 URL: https://issues.apache.org/jira/browse/YARN-674
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Omkar Vinit Joshi
>         Attachments: YARN-674.1.patch
>
>
> This was caused by YARN-280. A slow or a down NameNode for will make it look like RM
is unavailable as it may run out of RPC handlers due to blocked client submissions.



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