Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2240#discussion_r17031806
--- Diff:
core/src/main/scala/org/apache/spark/network/BlockTransferService.scala ---
@@ -0,0 +1,114 @@
+/*
+ * 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.network
+
+import org.apache.spark.storage.StorageLevel
+
+
+abstract class BlockTransferService {
+
+ /**
+ * Initialize the transfer service by giving it the BlockDataManager
that can be used to fetch
+ * local blocks or put local blocks.
+ */
+ def init(blockDataManager: BlockDataManager)
+
+ /**
+ * Tear down the transfer service.
+ */
+ def stop(): Unit
+
+ /**
+ * Port number the service is listening on, available only after
[[init]] is invoked.
+ */
+ def port: Int
+
+ /**
+ * Host name the service is listening on, available only after [[init]]
is invoked.
+ */
+ def hostName: String
+
+ /**
+ * Fetch a sequence of blocks from a remote node asynchronously,
+ * available only after [[init]] is invoked.
+ *
+ * Note that [[BlockFetchingListener.onBlockFetchSuccess]] is called
once per block,
+ * while [[BlockFetchingListener.onBlockFetchSuccess]] is called once
per failure.
--- End diff --
yes - going to update it.
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