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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1521) Mark appropriate protocol methods with the idempotent annotation or AtMostOnce annotation
Date Mon, 24 Mar 2014 21:42:49 GMT

    [ https://issues.apache.org/jira/browse/YARN-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13945736#comment-13945736
] 

Jian He commented on YARN-1521:
-------------------------------

post initial review:
- this doesn’t seem correct, user is possible to get multiple delegation tokens. Given this
change, user can only get one token
{code}
 // check whether the token exists or not.
      // If this token existed, recover the token with
      // DelegationTokenInformation
{code}
- Explicitly assert the App does not exist in RMStateStore or not.
{code}
    // After submission, the applicationState will
    // not be saved in RMStateStore
{code}
- Explicitly assert the app exists in RMContext after the 2nd RM comes Active.
{code}
// Submit Application
// After submission, the applicationState will be saved in RMStateStore.
{code}
- The bulk of test-specific hack in MiniYarnCluster can be moved to TestHAProtocol, as MiniYarnCluster
is commonly used by others.

> Mark appropriate protocol methods with the idempotent annotation or AtMostOnce annotation
> -----------------------------------------------------------------------------------------
>
>                 Key: YARN-1521
>                 URL: https://issues.apache.org/jira/browse/YARN-1521
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-1521.0.patch
>
>
> After YARN-1028, we add the automatically failover into RMProxy. This JIRA is to identify
whether we need to add idempotent annotation and which methods can be marked as idempotent.



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