1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/*
* 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, TransportClient}
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: TransportClient,
blockIds: Seq[String],
listener: BlockFetchingListener)
extends Logging {
require(blockIds.nonEmpty)
private val ser = serializer.newInstance()
private var streamHandle: ShuffleStreamHandle = _
private 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);
}
}
}
/** Begins the fetching process, calling the listener with every block fetched. */
def start(): Unit = {
// 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(blockId => Utils.tryLog(listener.onBlockFetchFailure(blockId, e)))
}
}
override def onFailure(e: Throwable): Unit = {
logError("Failed while starting block fetches", e)
blockIds.foreach(blockId => Utils.tryLog(listener.onBlockFetchFailure(blockId, e)))
}
})
}
}
|
