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From "Jitendra Nath Pandey (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8044) Unify ProtocolMetaInterface and ProtocolTranslator interface
Date Thu, 09 Feb 2012 06:40:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204310#comment-13204310
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Jitendra Nath Pandey commented on HADOOP-8044:
----------------------------------------------

  ProtocolMetaInterface is supposed to be used to obtain information about underlying protocol
e.g. to check if a method is supported on the server side. Its implementation creates ProtocolMetaInfoPB
connection to server and gets protocol signatures. For (contrived)example, in future if we
want to add a method to find how many versions of the given protocol are supported at the
server, we could add a method in this interface.
 
 I think ProtocolTranslator was added as a mechanism to expose the proxy so as to reach the
connectionId.
 They have two very different purposes.
                
> Unify ProtocolMetaInterface and ProtocolTranslator interface
> ------------------------------------------------------------
>
>                 Key: HADOOP-8044
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8044
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ha, ipc
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>            Priority: Minor
>             Fix For: HA Branch (HDFS-1623)
>
>
> In the HA branch we have a "ProtocolTranslator" interface which we had to add, and it
seems to have the same purpose as the "ProtocolMetaInterface" interface which got added in
trunk in the meantime. We should unify the two.

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