Todd Lipcon created HADOOP-8394:
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Summary: Add flag in RPC requests indicating when a call is a retry
Key: HADOOP-8394
URL: https://issues.apache.org/jira/browse/HADOOP-8394
Project: Hadoop Common
Issue Type: Improvement
Components: ipc
Affects Versions: 2.0.0
Reporter: Todd Lipcon
Priority: Minor
For idempotent operations, the IPC client transparently retries calls. For
operations which aren't inherently idempotent, we often have to use some tricky
logic to make them idempotent -- see HDFS-3031 for example. It would be nice if
the RPC request had a flag indicating that the client was making a retry. Then,
in the server side logic, we can add sanity checks that, when the logic
indicates a call is an idempotent retry, the RPC call agrees.
One example where this is useful is the close() RPC. We can make it idempotent
by saying that close() on an already-closed file should succeed. But, it's
really an error to call close() twice outside the context of retries. Having
this property set on the call would allow us to enable the "double close is OK"
semantics only for retries.
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