Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/3142#discussion_r19984426
--- Diff:
core/src/main/scala/org/apache/spark/deploy/worker/WorkerShuffleService.scala
---
@@ -0,0 +1,65 @@
+/*
+ * 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.deploy.worker
+
+import org.apache.spark.{Logging, SparkConf, SecurityManager}
+import org.apache.spark.network.TransportContext
+import org.apache.spark.network.netty.SparkTransportConf
+import org.apache.spark.network.sasl.SaslRpcHandler
+import org.apache.spark.network.server.TransportServer
+import org.apache.spark.network.shuffle.ExternalShuffleBlockHandler
+
+/**
+ * Provides a server from which Executors can read shuffle files (rather
than reading directly from
+ * each other), to provide uninterrupted access to the files in the face
of executors being turned
+ * off or killed.
+ *
+ * Optionally requires SASL authentication in order to read. See
[[SecurityManager]].
+ */
+private[worker]
+class WorkerShuffleService(sparkConf: SparkConf, securityManager:
SecurityManager) extends Logging {
+
+ private val enabled =
sparkConf.getBoolean("spark.shuffle.service.enabled", false)
+ private val port = sparkConf.getInt("spark.shuffle.service.port", 7337)
+ private val useSasl: Boolean = securityManager.isAuthenticationEnabled()
+
+ private val transportConf = SparkTransportConf.fromSparkConf(sparkConf)
+ private val blockHandler = new ExternalShuffleBlockHandler()
+ private val transportContext: TransportContext = {
+ val handler = if (useSasl) new SaslRpcHandler(blockHandler,
securityManager) else blockHandler
+ new TransportContext(transportConf, handler)
+ }
+
+ private var server: TransportServer = _
+
+ /** Starts the external shuffle service if the user has configured us
to. */
+ def startIfEnabled() {
+ if (enabled) {
+ require(server == null, "Shuffle server already started")
+ logInfo(s"Starting shuffle service on port $port with useSasl =
$useSasl")
+ server = transportContext.createServer(port)
+ }
+ }
--- End diff --
Intentionally, the constructors of those objects do no work at all, only
setting field variables. It should be generally reasonable to construct these
objects and expect no allocation or threads to be started.
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