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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7379) Add ability to include Protobufs in ObjectWritable
Date Mon, 13 Jun 2011 03:31:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048451#comment-13048451
] 

Todd Lipcon commented on HADOOP-7379:
-------------------------------------

bq. What will it take to get ipc.Server to understand PB rather than Writable?

You mean using PBs for the actual invocations? Or the "header" type info at the beginning?
I think most of the value from PB comes from the evolvable parameter types, but moving to
PB for the headers would also allow us to do things like add extra metadata to requests without
breaking previous versions (eg dapper-style tracing info?)

> Add ability to include Protobufs in ObjectWritable
> --------------------------------------------------
>
>                 Key: HADOOP-7379
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7379
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io, ipc
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.23.0
>
>         Attachments: hadoop-7379.txt, hadoop-7379.txt
>
>
> Per HDFS-2060, it would make it easier to piecemeal switch to protocol buffer based data
structures in the wire protocol if we could intermix the two. The IPC framework currently
provides the concept of "engines" for RPC, but that doesn't easily allow mixed types within
the same framework for ease of transition.
> I'd like to add the cases to ObjectWritable to be handle subclasses of {{Message}}, the
superclass of codegenned protobufs.

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