Send back nicer error to clients using outdated IPC version
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Key: HADOOP-7346
URL: https://issues.apache.org/jira/browse/HADOOP-7346
Project: Hadoop Common
Issue Type: Improvement
Components: ipc
Affects Versions: 0.22.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Fix For: 0.22.0
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.
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