Github user tedyu commented on a diff in the pull request:
https://github.com/apache/spark/pull/9254#discussion_r42896202
--- Diff: core/src/main/scala/org/apache/spark/rpc/netty/Outbox.scala ---
@@ -215,7 +216,7 @@ private[netty] class Outbox(nettyEnv: NettyRpcEnv, val
address: RpcAddress) {
// update messages and it's safe to just drain the queue.
var message = messages.poll()
--- End diff --
In that case the exception is no longer a singleton - it is created inside
handleNetworkFailure().
Network failure should be rare but when it happens, there may be
non-trivial number of messages to be notified.
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