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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 Sat, 22 Mar 2014 00:38:43 GMT

    [ https://issues.apache.org/jira/browse/YARN-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13943793#comment-13943793
] 

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

- getNewApplicationId , getDelegationToken. since each call returns a new ID/Token,  not sure
this matches with idempotency.
- For the registers protocols. For example, registerNodeManager : if previous call succeeds,
RM didn't crash, registerNodeManager retry because of some network problem, the next call
comes in, this node is deemed as a reconnected node instead of a new node.  Probably AtMostOnce?

> 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
>
> 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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