[HADOOP-7346] Send back nicer error to clients using outdated IPC version

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.22.0
• Fix Version/s: 0.22.0
• Component/s: ipc
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 01/Jun/11 01:01
• Updated: 26/Oct/16 07:19
• Resolved: 06/Jun/11 05:32

Description

When an older Hadoop version tries to contact a newer Hadoop version across an IPC protocol version bump, the client currently just gets a non-useful error message like "EOFException".

Instead, the IPC server code can speak just enough of prior IPC protocols to send back a "fatal" message indicating the version mismatch.

Issue Links

• is duplicated by: HADOOP-7505 EOFException in RPC stack should have a nicer error message