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https://issues.apache.org/jira/browse/HADOOP-7557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100490#comment-13100490
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Doug Cutting commented on HADOOP-7557:
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Protocol buffers are a lot more than just that. If that's all that's required,
then the protocol specification can define constants for these, e.g.:
[16-bit key] [16-bit value_length] [value]
A particular key constant can be reserved for "dynamic" parameters, e.g.,
[ key=OTHER] [ 16-bit payload_length] [16-bit key_length] [key] [value]
(The length of the value is payload_length - key_length.)
A "dynamic" parameter that's used a lot could get incorporated into the next
version of the protocol specification.
I also question whether the size of RPC headers is a significant factor in
Hadoop performance. Even when the payload is only a few bytes, the dominant
cost is not network bandwidth nor request parsing.
> 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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