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From "Doug Cutting (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7776) Make the Ipc-Header in a RPC-Payload an explicit header
Date Mon, 31 Oct 2011 16:39:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13140285#comment-13140285

Doug Cutting commented on HADOOP-7776:

This looks good.

If you wanted to make this more easily extensible (HADOOP-7557) then you might change it to
have a <<key,value> format, perhaps where keys are vints and values are <vint><payload>.
 If you put the current three values (kind, op, id) then its size would grow from 6 to perhaps
10 bytes.  Alternately you could add a metadata field <count, <key,value>> for
future use which would only add a single byte but wouldn't let you ever remove one of the
initial three fields.

Per-call metadata would make it easier to add, e.g., Dapper-style tracing.
> Make the Ipc-Header in a RPC-Payload an explicit header
> -------------------------------------------------------
>                 Key: HADOOP-7776
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7776
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>         Attachments: RpcPayLoadHeader.java, rpcPayload1.patch, rpcPayload2.patch

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