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https://issues.apache.org/jira/browse/YARN-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14161280#comment-14161280
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Jian He commented on YARN-1879:
-------------------------------

I think we are mixing two issues in this jira:
1. Mark annotation on protocol for failover. (RM work-preserving failover won’t 
work without proper protocol annotations. RetryCache won’t help in this 
scenario, as the cache simply gets cleaned-up after failover/restart)
2. Change the API to return same response for duplicate requests.
I propose let’s do 1) first which is what really affects work-preserving RM 
failover, and do 2) separately.

> Mark Idempotent/AtMostOnce annotations to ApplicationMasterProtocol
> -------------------------------------------------------------------
>
>                 Key: YARN-1879
>                 URL: https://issues.apache.org/jira/browse/YARN-1879
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Jian He
>            Assignee: Tsuyoshi OZAWA
>            Priority: Critical
>         Attachments: YARN-1879.1.patch, YARN-1879.1.patch, 
> YARN-1879.11.patch, YARN-1879.12.patch, YARN-1879.13.patch, 
> YARN-1879.14.patch, YARN-1879.15.patch, YARN-1879.16.patch, 
> YARN-1879.17.patch, YARN-1879.18.patch, YARN-1879.19.patch, 
> YARN-1879.2-wip.patch, YARN-1879.2.patch, YARN-1879.20.patch, 
> YARN-1879.21.patch, YARN-1879.22.patch, YARN-1879.3.patch, YARN-1879.4.patch, 
> YARN-1879.5.patch, YARN-1879.6.patch, YARN-1879.7.patch, YARN-1879.8.patch, 
> YARN-1879.9.patch
>
>




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