[HADOOP-7379] Add ability to include Protobufs in ObjectWritable

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.0
• Fix Version/s: 0.23.0
• Component/s: io, ipc
• Hadoop Flags: Reviewed
• Release Note: Protocol buffer-generated types may now be used as arguments or return values for Hadoop RPC.
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 10/Jun/11 23:13
• Updated: 15/Nov/11 00:50
• Resolved: 15/Jun/11 22:22

Description

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.

Issue Links

• blocks: HDFS-2060 DFS client RPCs using protobufs