Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2753#discussion_r19383298
--- Diff:
core/src/main/scala/org/apache/spark/network/netty/NettyBlockFetcher.scala ---
@@ -0,0 +1,92 @@
+/*
+ * 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 java.util
+
+import org.apache.spark.{SparkConf, Logging}
+import org.apache.spark.network.BlockFetchingListener
+import org.apache.spark.network.netty.NettyMessages._
+import org.apache.spark.serializer.{JavaSerializer, Serializer}
+import org.apache.spark.network.buffer.ManagedBuffer
+import org.apache.spark.network.client.{RpcResponseCallback,
ChunkReceivedCallback, SluiceClient}
+import org.apache.spark.storage.BlockId
+import org.apache.spark.util.Utils
+
+/**
+ * Responsible for holding the state for a request for a single set of
blocks. This assumes that
+ * the chunks will be returned in the same order as requested, and that
there will be exactly
+ * one chunk per block.
+ *
+ * Upon receipt of any block, the listener will be called back. Upon
failure part way through,
+ * the listener will receive a failure callback for each outstanding block.
+ */
+class NettyBlockFetcher(
+ serializer: Serializer,
+ client: SluiceClient,
+ blockIds: Seq[String],
+ listener: BlockFetchingListener)
+ extends Logging {
+
+ require(blockIds.nonEmpty)
+
+ val ser = serializer.newInstance()
+
+ var streamHandle: ShuffleStreamHandle = _
+
+ val chunkCallback = new ChunkReceivedCallback {
+ // On receipt of a chunk, pass it upwards as a block.
+ def onSuccess(chunkIndex: Int, buffer: ManagedBuffer): Unit =
Utils.logUncaughtExceptions {
+ listener.onBlockFetchSuccess(blockIds(chunkIndex), buffer)
+ }
+
+ // On receipt of a failure, fail every block from chunkIndex onwards.
+ def onFailure(chunkIndex: Int, e: Throwable): Unit = {
+ blockIds.drop(chunkIndex).foreach { blockId =>
+ listener.onBlockFetchFailure(blockId, e);
+ }
+ }
+ }
+
+ // Send the RPC to open the given set of blocks. This will return a
ShuffleStreamHandle.
+
client.sendRpc(ser.serialize(OpenBlocks(blockIds.map(BlockId.apply))).array(),
+ new RpcResponseCallback {
+ override def onSuccess(response: Array[Byte]): Unit = {
+ try {
+ streamHandle =
ser.deserialize[ShuffleStreamHandle](ByteBuffer.wrap(response))
+ logTrace(s"Successfully opened block set: $streamHandle!
Preparing to fetch chunks.")
+
+ // Immediately request all chunks -- we expect that the total
size of the request is
+ // reasonable due to higher level chunking in
[[ShuffleBlockFetcherIterator]].
+ for (i <- 0 until streamHandle.numChunks) {
+ client.fetchChunk(streamHandle.streamId, i, chunkCallback)
+ }
+ } catch {
+ case e: Exception =>
+ logError("Failed while starting block fetches", e)
+ blockIds.foreach(listener.onBlockFetchFailure(_, e))
+ }
+ }
+
+ override def onFailure(e: Throwable): Unit = {
+ logError("Failed while starting block fetches")
+ blockIds.foreach(listener.onBlockFetchFailure(_, e))
--- End diff --
here too
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