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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.
*/
package org.apache.spark.network.netty
import java.nio.ByteBuffer
import org.apache.spark.Logging
import org.apache.spark.network.BlockDataManager
import org.apache.spark.serializer.Serializer
import org.apache.spark.network.buffer.{NioManagedBuffer, ManagedBuffer}
import org.apache.spark.network.client.{TransportClient, RpcResponseCallback}
import org.apache.spark.network.server.{DefaultStreamManager, RpcHandler}
import org.apache.spark.storage.{StorageLevel, BlockId}
import scala.collection.JavaConversions._
object NettyMessages {
/** Request to read a set of blocks. Returns [[ShuffleStreamHandle]] to identify the stream. */
case class OpenBlocks(blockIds: Seq[BlockId])
/** Request to upload a block with a certain StorageLevel. Returns nothing (empty byte array). */
case class UploadBlock(blockId: BlockId, blockData: Array[Byte], level: StorageLevel)
/** Identifier for a fixed number of chunks to read from a stream created by [[OpenBlocks]]. */
case class ShuffleStreamHandle(streamId: Long, numChunks: Int)
}
/**
* Serves requests to open blocks by simply registering one chunk per block requested.
*/
class NettyBlockRpcServer(
serializer: Serializer,
streamManager: DefaultStreamManager,
blockManager: BlockDataManager)
extends RpcHandler with Logging {
import NettyMessages._
override def receive(
client: TransportClient,
messageBytes: Array[Byte],
responseContext: RpcResponseCallback): Unit = {
val ser = serializer.newInstance()
val message = ser.deserialize[AnyRef](ByteBuffer.wrap(messageBytes))
logTrace(s"Received request: $message")
message match {
case OpenBlocks(blockIds) =>
val blocks: Seq[ManagedBuffer] = blockIds.map(blockManager.getBlockData)
val streamId = streamManager.registerStream(blocks.iterator)
logTrace(s"Registered streamId $streamId with ${blocks.size} buffers")
responseContext.onSuccess(
ser.serialize(new ShuffleStreamHandle(streamId, blocks.size)).array())
case UploadBlock(blockId, blockData, level) =>
blockManager.putBlockData(blockId, new NioManagedBuffer(ByteBuffer.wrap(blockData)), level)
responseContext.onSuccess(new Array[Byte](0))
}
}
}
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