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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9792) Retry the methods that are tagged @AtMostOnce along with @Idempotent
Date Thu, 01 Aug 2013 03:25:49 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726005#comment-13726005
] 

Suresh Srinivas commented on HADOOP-9792:
-----------------------------------------

[~atm] There is an excellent coverage of this at http://www.ee.tamu.edu/~reddy/ee602_00/rpc_04.doc.

Please read the doc. While retriable could be an easier tag for people to understand, at-most-once
is the right tag. Also if you have retriable, you do not need idempotent tag as well, since
by definition idempotent are retriable. Current annotations are much better; one knows what
operations are idempotent and what provide at-most-once semantics. Again I have to disagree
that retry-cache makes an operation idempotent.
                
> Retry the methods that are tagged @AtMostOnce along with @Idempotent
> --------------------------------------------------------------------
>
>                 Key: HADOOP-9792
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9792
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>             Fix For: 2.1.0-beta
>
>         Attachments: HADOOP-9792.1.patch, HADOOP-9792.patch
>
>
> Currently the operations marked as @Idempotent are retried. Now that we have added new
operations that are marked @AtMostOnce that guaranteed to be executed only once with the help
of RetryCache on server implementation, these methods should also be retried.

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