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From "Doug Cutting (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7557) Make IPC header be extensible
Date Thu, 13 Oct 2011 17:49:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13126755#comment-13126755
] 

Doug Cutting commented on HADOOP-7557:
--------------------------------------

> I added the protocolKind to distinguish between these.

This seems analagous to HTTP's Content-Type and may be useful if we expect to support multiple
kinds of RPC payloads from a server.  Do we expect that long-term?  If we do only short-term
we might handle different kinds of payloads with the ConnectionHeader version.

Also, why are ConnectionHeader and IpcConnectionHeader separate?  It makes sense to separate
them if IpcConnectionHeader is specific to the protocolKind, but otherwise, if both headers
are universal, perhaps they could be combined.  If they're universal then they shouldn't depend
on Writable, Protocol Buffers or Avro, but rather should be explicitly and fully specified
in the protocol.
                
> Make  IPC  header be extensible
> -------------------------------
>
>                 Key: HADOOP-7557
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7557
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>         Attachments: HADOOP-7557.patch, IpcHeader.proto, ipcHeader1.patch, ipcHeader2.patch
>
>


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