[
https://issues.apache.org/jira/browse/YARN-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13954920#comment-13954920
]
Tsuyoshi OZAWA commented on YARN-1879:
--------------------------------------
{code}
If the application has already registered/unregistered, duplicate
register/unregister attempts can cause exceptions.
{code}
This is correct, and is a subtle problem. If a RPC client, AM, think it's
fatal, AM stops. Currently ARMRMClientImpl#registerApplicationMaster() can
throw exceptions and ApplicationMaster doesn't handle them, so it causes AM
failure. We preserve the semantics, we should mark
ApplicationMasterProtocol#registerApplicationMaster() as AtMostOnce.
About ARMRMClientImpl#unregisterApplicationMaster(), AM just log the failure of
RPC and continue to stop. Therefore, we can make
ApplicationMasterProtocol#unregisterApplicationMaster() as Idempotent.
> 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
>
>
--
This message was sent by Atlassian JIRA
(v6.2#6252)
