[HADOOP-677] RPC should send a fixed header and version at the start of connection

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.7.2
• Fix Version/s: 0.9.0
• Component/s: ipc
• Assignee: Owen O'Malley
• Reporter: Owen O'Malley
• Created: 02/Nov/06 23:42
• Updated: 01/Dec/06 22:43
• Resolved: 21/Nov/06 00:26

Description

There have been problems with http clients connecting to the RPC servers, which causes the RPC to try and allocate huge buffers and get OutOfMemoryExceptions. I want to have a fixed prefix that is sent first that identifies it as an RPC client. To make the system compatible as much as possible, I'd make the servers accept both forms for a Hadoop release and then change the clients to send the prefix, and finally make the servers only accept the new form.