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37 changes: 37 additions & 0 deletions
37
core/src/main/scala/org/apache/spark/network/BlockFetchingListener.scala
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,37 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.spark.network | ||
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| import java.util.EventListener | ||
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| /** | ||
| * Listener callback interface for [[BlockTransferService.fetchBlocks]]. | ||
| */ | ||
| trait BlockFetchingListener extends EventListener { | ||
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| /** | ||
| * Called once per successfully fetched block. | ||
| */ | ||
| def onBlockFetchSuccess(blockId: String, data: ManagedBuffer): Unit | ||
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| /** | ||
| * Called upon failures. For each failure, this is called only once (i.e. not once per block). | ||
| */ | ||
| def onBlockFetchFailure(exception: Throwable): Unit | ||
| } |
131 changes: 131 additions & 0 deletions
131
core/src/main/scala/org/apache/spark/network/BlockTransferService.scala
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.spark.network | ||
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| import scala.concurrent.{Await, Future} | ||
| import scala.concurrent.duration.Duration | ||
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| import org.apache.spark.storage.StorageLevel | ||
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| abstract class BlockTransferService { | ||
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| /** | ||
| * 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) | ||
|
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| /** | ||
| * Tear down the transfer service. | ||
| */ | ||
| def stop(): Unit | ||
|
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| /** | ||
| * Port number the service is listening on, available only after [[init]] is invoked. | ||
| */ | ||
| def port: Int | ||
|
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| /** | ||
| * Host name the service is listening on, available only after [[init]] is invoked. | ||
| */ | ||
| def hostName: String | ||
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| /** | ||
| * 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.onBlockFetchFailure]] is called once per failure (not per block). | ||
| * | ||
| * Note that this API takes a sequence so the implementation can batch requests, and does not | ||
| * return a future so the underlying implementation can invoke onBlockFetchSuccess as soon as | ||
| * the data of a block is fetched, rather than waiting for all blocks to be fetched. | ||
| */ | ||
| def fetchBlocks( | ||
| hostName: String, | ||
| port: Int, | ||
| blockIds: Seq[String], | ||
| listener: BlockFetchingListener): Unit | ||
|
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| /** | ||
| * Upload a single block to a remote node, available only after [[init]] is invoked. | ||
| */ | ||
| def uploadBlock( | ||
| hostname: String, | ||
| port: Int, | ||
| blockId: String, | ||
| blockData: ManagedBuffer, | ||
| level: StorageLevel): Future[Unit] | ||
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| /** | ||
| * A special case of [[fetchBlocks]], as it fetches only one block and is blocking. | ||
| * | ||
| * It is also only available after [[init]] is invoked. | ||
| */ | ||
| def fetchBlockSync(hostName: String, port: Int, blockId: String): ManagedBuffer = { | ||
| // A monitor for the thread to wait on. | ||
| val lock = new Object | ||
| @volatile var result: Either[ManagedBuffer, Throwable] = null | ||
| fetchBlocks(hostName, port, Seq(blockId), new BlockFetchingListener { | ||
| override def onBlockFetchFailure(exception: Throwable): Unit = { | ||
| lock.synchronized { | ||
| result = Right(exception) | ||
| lock.notify() | ||
| } | ||
| } | ||
| override def onBlockFetchSuccess(blockId: String, data: ManagedBuffer): Unit = { | ||
| lock.synchronized { | ||
| result = Left(data) | ||
| lock.notify() | ||
| } | ||
| } | ||
| }) | ||
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| // Sleep until result is no longer null | ||
| lock.synchronized { | ||
| while (result == null) { | ||
| try { | ||
| lock.wait() | ||
| } catch { | ||
| case e: InterruptedException => | ||
| } | ||
| } | ||
| } | ||
|
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| result match { | ||
| case Left(data) => data | ||
| case Right(e) => throw e | ||
| } | ||
| } | ||
|
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| /** | ||
| * Upload a single block to a remote node, available only after [[init]] is invoked. | ||
| * | ||
| * This method is similar to [[uploadBlock]], except this one blocks the thread | ||
| * until the upload finishes. | ||
| */ | ||
| def uploadBlockSync( | ||
| hostname: String, | ||
| port: Int, | ||
| blockId: String, | ||
| blockData: ManagedBuffer, | ||
| level: StorageLevel): Unit = { | ||
| Await.result(uploadBlock(hostname, port, blockId, blockData, level), Duration.Inf) | ||
| } | ||
| } |
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