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https://issues.apache.org/jira/browse/HADOOP-9683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699520#comment-13699520
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Luke Lu commented on HADOOP-9683:
---------------------------------
The patch lgtm. Minor nit: it'll be nice to preserve the "bytes read" in the
exception log in Listener#doRead.
> Wrap IpcConnectionContext in RPC headers
> ----------------------------------------
>
> Key: HADOOP-9683
> URL: https://issues.apache.org/jira/browse/HADOOP-9683
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: ipc
> Reporter: Luke Lu
> Assignee: Daryn Sharp
> Priority: Blocker
> Attachments: HADOOP-9683.patch
>
>
> After HADOOP-9421, all RPC exchanges (including SASL) are wrapped in RPC
> headers except IpcConnectionContext, which is still raw protobuf, which makes
> request pipelining (a desirable feature for things like HDFS-2856) impossible
> to achieve in a backward compatible way. Let's finish the job and wrap
> IpcConnectionContext with the RPC request header with the call id of
> SET_IPC_CONNECTION_CONTEXT. Or simply make it an optional field in the RPC
> request header that gets set for the first RPC call of a given stream.
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