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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-4974) Analyze and add annotations to Namenode and Datanode protocol methods to enable retry
Date Fri, 19 Jul 2013 08:38:50 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713444#comment-13713444
] 

Suresh Srinivas edited comment on HDFS-4974 at 7/19/13 8:37 AM:
----------------------------------------------------------------

Made the following changes in this early patch:
# I added a new annotation "AtMostOnce" to annotate the methods that guarantee the "at-most-once"
semantics. That is the server-side executes these methods only once using retry cache functionality.
# I have added annotations to all the methods in protocols implemented by the namenode.
# Also added a test to ensure we check for these annotations. This will ensure future protocol
changes where someone might miss adding the annotation.

                
      was (Author: sureshms):
    Made following changes in this early patch:
# I added a new annotation "AtMostOnce" to annotate the methods that guarantee the "at-most-once"
semantics. That is the server-side executes these methods only once using retry cache functionality.
# I have added annotations to all the methods in protocols implemented by the namenode.
# Also added a test to ensure we check for these annotations. This will ensure future protocol
changes where someone might miss adding the annotation.

                  
> Analyze and add annotations to Namenode and Datanode protocol methods to enable retry
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-4974
>                 URL: https://issues.apache.org/jira/browse/HDFS-4974
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, namenode
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: HDFS-4974.patch
>
>
> This jira is intended for:
> # Discussing current @Idempotent annotations in HDFS protocols and adding that annotation
where it is missing.
> # Discuss how retry should be enabled for non-idempotent requests.
> I will post the analysis of current methods in a subsequent comment.

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