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https://issues.apache.org/jira/browse/HADOOP-7379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HADOOP-7379:
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Attachment: hadoop-7379.txt
Here's a patch which does the following:
- protobufs can be serialized by ObjectWritable. They are length-prefixed with
a varint and then written on the wire
- adds test for the writable format itself
- adds a call in TestIPC that uses a protobuf as a parameter and response
I see one spot for an optimization by removing a buffer copy on the read side,
but I'd like to leave that for later.
> 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
>
>
> 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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