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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7557) Make IPC and RPC headers be extensible
Date Thu, 08 Sep 2011 16:34:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100433#comment-13100433
] 

Todd Lipcon commented on HADOOP-7557:
-------------------------------------

IMO key-value pairs as used in HTTP/etc are not appropriate for RPC due to their lack of compactness.
A typical HTTP payload is many KB, so a multi-hundred-byte header seems fine. A typical Hadoop
RPC payload may only be a few bytes, so a lengthy header ("X-Hadoop-RPC-Version: 1.0") is
a lot of overhead. The obvious solution is to have well-defined numeric tags for each header
maintained centrally, and then just use those tags instead. And that's basically protocol
buffers :)

> Make  IPC and RPC headers be extensible
> ---------------------------------------
>
>                 Key: HADOOP-7557
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7557
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Sanjay Radia
>


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