Github user BryanCutler commented on a diff in the pull request:
https://github.com/apache/spark/pull/6205#discussion_r32356652
--- Diff: core/src/main/scala/org/apache/spark/rpc/RpcEnv.scala ---
@@ -182,3 +184,114 @@ private[spark] object RpcAddress {
RpcAddress(host, port)
}
}
+
+
+/**
+ * An exception thrown if RpcTimeout modifies a [[TimeoutException]].
+ */
+private[rpc] class RpcTimeoutException(message: String, cause:
TimeoutException)
+ extends TimeoutException(message) { initCause(cause) }
+
+
+/**
+ * Associates a timeout with a description so that a when a
TimeoutException occurs, additional
+ * context about the timeout can be amended to the exception message.
+ * @param timeout timeout duration in seconds
+ * @param description description to be displayed in a timeout exception
+ */
+private[spark] class RpcTimeout(timeout: FiniteDuration, description:
String) {
+
+ /** Get the timeout duration */
+ def duration: FiniteDuration = timeout
+
+ /** Get the message associated with this timeout */
+ def message: String = description
+
+ /** Amends the standard message of TimeoutException to include the
description */
+ private def createRpcTimeoutException(te: TimeoutException):
RpcTimeoutException = {
+ new RpcTimeoutException(te.getMessage() + " " + description, te)
+ }
+
+ /**
+ * PartialFunction to match a TimeoutException and add the timeout
description to the message
+ *
+ * @note This can be used in the recover callback of a Future to add to
a TimeoutException
+ * Example:
+ * val timeout = new RpcTimeout(5 millis, "short timeout")
+ * Future(throw new
TimeoutException).recover(timeout.addMessageIfTimeout)
+ */
+ def addMessageIfTimeout[T]: PartialFunction[Throwable, T] = {
+ // The exception has already been converted to a RpcTimeoutException
so just raise it
+ case rte: RpcTimeoutException => throw rte
+ // Any other TimeoutException get converted to a RpcTimeoutException
with modified message
+ case te: TimeoutException => throw createRpcTimeoutException(te)
+ }
+
+ /**
+ * Wait for the completed result and return it. If the result is not
available within this
+ * timeout, throw a [[RpcTimeoutException]] to indicate which
configuration controls the timeout.
+ * @param awaitable the `Awaitable` to be awaited
+ * @throws RpcTimeoutException if after waiting for the specified time
`awaitable`
+ * is still not ready
+ */
+ def awaitResult[T](awaitable: Awaitable[T]): T = {
+ try {
+ Await.result(awaitable, duration)
+ } catch addMessageIfTimeout
+ }
+}
+
+
+object RpcTimeout {
+
+ private[this] val messagePrefix = "This timeout is controlled by "
--- End diff --
I see what you're saying. I kept the `messagePrefix` separated so that if
there was ever a need to create a `RpcTimeout` without a conf, it would still
be possible and the message could be fit accordingly. But not a big deal, I'll
put in the above patch. Right now it's always tied to a conf, so it does make
sense.
Quick Scala question: would it be better to make the constructor use `val
timeout: FiniteDuration` and remove that getter method too?
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