Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4588#discussion_r26140416
--- Diff: core/src/main/scala/org/apache/spark/rpc/RpcEnv.scala ---
@@ -0,0 +1,370 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.rpc
+
+import java.net.URI
+
+import scala.concurrent.Future
+import scala.concurrent.duration.FiniteDuration
+import scala.reflect.ClassTag
+
+import org.apache.spark.{SparkException, SecurityManager, SparkConf}
+import org.apache.spark.util.Utils
+
+/**
+ * An RPC environment. [[RpcEndpoint]]s need to register itself with a
name to [[RpcEnv]] to
+ * receives messages. Then [[RpcEnv]] will process messages sent from
[[RpcEndpointRef]] or remote
+ * nodes, and deliver them to corresponding [[RpcEndpoint]]s.
+ *
+ * [[RpcEnv]] also provides some methods to retrieve [[RpcEndpointRef]]s
given name or uri.
+ */
+private[spark] trait RpcEnv {
+
+ /**
+ * Return RpcEndpointRef of the registered [[RpcEndpoint]]. Will be used
to implement
+ * [[RpcEndpoint.self]].
+ */
+ private[rpc] def endpointRef(endpoint: RpcEndpoint): RpcEndpointRef
+
+ /**
+ * Return the address that [[RpcEnv]] is listening to.
+ */
+ def address: RpcAddress
+
+ /**
+ * Register a [[RpcEndpoint]] with a name and return its
[[RpcEndpointRef]]. [[RpcEnv]] does not
+ * guarantee thread-safety.
+ */
+ def setupEndpoint(name: String, endpoint: RpcEndpoint): RpcEndpointRef
+
+ /**
+ * Register a [[RpcEndpoint]] with a name and return its
[[RpcEndpointRef]]. [[RpcEnv]] should
+ * make sure thread-safely sending messages to [[RpcEndpoint]].
+ */
+ def setupThreadSafeEndpoint(name: String, endpoint: RpcEndpoint):
RpcEndpointRef
+
+ /**
+ * Retrieve a [[RpcEndpointRef]] which is located in the driver via its
name.
+ */
+ def setupDriverEndpointRef(name: String): RpcEndpointRef
+
+ /**
+ * Retrieve the [[RpcEndpointRef]] represented by `url`.
+ */
+ def setupEndpointRefByUrl(url: String): RpcEndpointRef
+
+ /**
+ * Retrieve the [[RpcEndpointRef]] represented by `systemName`,
`address` and `endpointName`
+ */
+ def setupEndpointRef(
+ systemName: String, address: RpcAddress, endpointName: String):
RpcEndpointRef
+
+ /**
+ * Stop [[RpcEndpoint]] specified by `endpoint`.
+ */
+ def stop(endpoint: RpcEndpointRef): Unit
+
+ /**
+ * Shutdown this [[RpcEnv]] asynchronously. If need to make sure
[[RpcEnv]] exits successfully,
+ * call [[awaitTermination()]] straight after [[shutdown()]].
+ */
+ def shutdown(): Unit
+
+ /**
+ * Wait until [[RpcEnv]] exits.
+ *
+ * TODO do we need a timeout parameter?
+ */
+ def awaitTermination(): Unit
+
+ /**
+ * Create a URI used to create a [[RpcEndpointRef]]. Use this one to
create the URI instead of
+ * creating it manually because different [[RpcEnv]] may have different
formats.
+ */
+ def uriOf(systemName: String, address: RpcAddress, endpointName:
String): String
+}
+
+private[spark] case class RpcEnvConfig(
+ conf: SparkConf,
+ name: String,
+ host: String,
+ port: Int,
+ securityManager: SecurityManager)
+
+/**
+ * A RpcEnv implementation must have a companion object with an
+ * `apply(config: RpcEnvConfig): RpcEnv` method so that it can be created
via Reflection.
+ *
+ * {{{
+ * object MyCustomRpcEnv {
+ * def apply(config: RpcEnvConfig): RpcEnv = {
+ * ...
+ * }
+ * }
+ * }}}
+ */
+private[spark] object RpcEnv {
+
+ private def getRpcEnvCompanion(conf: SparkConf): AnyRef = {
+ // Add more RpcEnv implementations here
+ val rpcEnvNames = Map("akka" -> "org.apache.spark.rpc.akka.AkkaRpcEnv")
+ val rpcEnvName = conf.get("spark.rpc", "akka")
+ val rpcEnvClassName = rpcEnvNames.getOrElse(rpcEnvName.toLowerCase,
rpcEnvName)
+ val companion = Class.forName(
+ rpcEnvClassName + "$", true,
Utils.getContextOrSparkClassLoader).getField("MODULE$").get(null)
+ companion
+ }
+
+ def create(
+ name: String,
+ host: String,
+ port: Int,
+ conf: SparkConf,
+ securityManager: SecurityManager): RpcEnv = {
+ // Using Reflection to create the RpcEnv to avoid to depend on Akka
directly
+ val config = RpcEnvConfig(conf, name, host, port, securityManager)
+ val companion = getRpcEnvCompanion(conf)
+ companion.getClass.getMethod("apply", classOf[RpcEnvConfig]).
+ invoke(companion, config).asInstanceOf[RpcEnv]
+ }
+
+}
+
+/**
+ * An end point for the RPC that defines what functions to trigger given a
message.
+ *
+ * RpcEndpoint will be guaranteed that `onStart`, `receive` and `onStop`
will
+ * be called in sequence.
+ *
+ * The lift-cycle will be:
+ *
+ * constructor onStart receive* onStop
+ *
+ * Note: `receive` can be called concurrently. If you want `receive` is
thread-safe, please use
+ * [[RpcEnv.setupThreadSafeEndpoint]]
+ *
+ * If any error is thrown from one of [[RpcEndpoint]] methods except
`onError`, `onError` will be
+ * invoked with the cause. If `onError` throws an error, [[RpcEnv]] will
ignore it.
+ */
+private[spark] trait RpcEndpoint {
+
+ /**
+ * The [[RpcEnv]] that this [[RpcEndpoint]] is registered to.
+ */
+ val rpcEnv: RpcEnv
+
+ /**
+ * The [[RpcEndpointRef]] of this [[RpcEndpoint]]. `self` will become
valid when `onStart` is
+ * called.
+ *
+ * Note: Because before `onStart`, [[RpcEndpoint]] has not yet been
registered and there is not
+ * valid [[RpcEndpointRef]] for it. So don't call `self` before
`onStart` is called.
+ */
+ final def self: RpcEndpointRef = {
+ require(rpcEnv != null, "rpcEnv has not been initialized")
+ rpcEnv.endpointRef(this)
+ }
+
+ /**
+ * Process messages from [[RpcEndpointRef.send]] or
[[RpcCallContext.reply)]]
+ */
+ def receive: PartialFunction[Any, Unit] = {
+ case _ => throw new SparkException(self + " does not implement
'receive'")
+ }
+
+ /**
+ * Process messages from [[RpcEndpointRef.sendWithReply]]
+ */
+ def receiveAndReply(context: RpcCallContext): PartialFunction[Any, Unit]
= {
+ case _ => context.sendFailure(new SparkException(self + " won't reply
anything"))
+ }
+
+ /**
+ * Call onError when any exception is thrown during handling messages.
+ *
+ * @param cause
+ */
+ def onError(cause: Throwable): Unit = {
+ // By default, throw e and let RpcEnv handle it
+ throw cause
+ }
+
+ /**
+ * Invoked before [[RpcEndpoint]] starts to handle any message.
+ */
+ def onStart(): Unit = {
+ // By default, do nothing.
+ }
+
+ /**
+ * Invoked when [[RpcEndpoint]] is stopping.
+ */
+ def onStop(): Unit = {
+ // By default, do nothing.
+ }
+
+ /**
+ * Invoked when `remoteAddress` is connected to the current node.
+ */
+ def onConnected(remoteAddress: RpcAddress): Unit = {
+ // By default, do nothing.
+ }
+
+ /**
+ * Invoked when `remoteAddress` is lost.
+ */
+ def onDisconnected(remoteAddress: RpcAddress): Unit = {
+ // By default, do nothing.
+ }
+
+ /**
+ * Invoked when some network error happens in the connection between the
current node and
+ * `remoteAddress`.
+ */
+ def onNetworkError(cause: Throwable, remoteAddress: RpcAddress): Unit = {
+ // By default, do nothing.
+ }
+
+ /**
+ * An convenient method to stop [[RpcEndpoint]].
+ */
+ final def stop(): Unit = {
+ val _self = self
+ if (_self != null) {
+ rpcEnv.stop(self)
+ }
+ }
+}
+
+/**
+ * A reference for a remote [[RpcEndpoint]]. [[RpcEndpointRef]] is
thread-safe.
+ */
+private[spark] trait RpcEndpointRef {
+
+ /**
+ * return the address for the [[RpcEndpointRef]]
+ */
+ def address: RpcAddress
+
+ def name: String
+
+ /**
+ * Send a message to the corresponding [[RpcEndpoint]] and get its
result within a default
+ * timeout, or throw a SparkException if this fails even after the
default number of retries.
+ *
+ * Note: this is a blocking action which may cost a lot of time, so
don't call it in an message
+ * loop of [[RpcEndpoint]].
+ *
+ * @param message the message to send
+ * @tparam T type of the reply message
+ * @return the reply message from the corresponding [[RpcEndpoint]]
+ */
+ def askWithReply[T: ClassTag](message: Any): T
+
+ /**
+ * Send a message to the corresponding [[RpcEndpoint.receive]] and get
its result within a
+ * specified timeout, throw a SparkException if this fails even after
the specified number of
+ * retries.
+ *
+ * Note: this is a blocking action which may cost a lot of time, so
don't call it in an message
+ * loop of [[RpcEndpoint]].
+ *
+ * @param message the message to send
+ * @param timeout the timeout duration
+ * @tparam T type of the reply message
+ * @return the reply message from the corresponding [[RpcEndpoint]]
+ */
+ def askWithReply[T: ClassTag](message: Any, timeout: FiniteDuration): T
+
+ /**
+ * Sends a one-way asynchronous message. Fire-and-forget semantics.
+ */
+ def send(message: Any): Unit
+
+ /**
+ * Send a message to the corresponding [[RpcEndpoint.receiveAndReply]]
asynchronously.
+ * Fire-and-forget semantics.
+ *
+ * The receiver will reply to sender's [[RpcEndpoint.receive]] or
[[RpcEndpoint.receiveAndReply]]
+ * depending on which one of [[RpcCallContext.reply]]s is called.
+ */
+ def sendWithReply(message: Any, sender: RpcEndpointRef): Unit
+
+ /**
+ * Send a message to the corresponding [[RpcEndpoint.receiveAndReply)]]
and return a `Future` to
+ * receive the reply within a default timeout.
+ */
+ def sendWithReply[T: ClassTag](message: Any): Future[T]
+
+ /**
+ * Send a message to the corresponding [[RpcEndpoint.receiveAndReply)]]
and return a `Future` to
+ * receive the reply within the specified timeout.
+ */
+ def sendWithReply[T: ClassTag](message: Any, timeout: FiniteDuration):
Future[T]
+
+ def toURI: URI
+}
+
+/**
+ * Represent a host with a port
--- End diff --
So you're saying that `RpcAddress` is the same thing as
`java.net.InetSocketAddress`?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
