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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* 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.storage
import java.io.{FileOutputStream, RandomAccessFile}
import java.nio.ByteBuffer
import java.nio.channels.FileChannel.MapMode
import scala.collection.mutable.ArrayBuffer
import org.apache.spark.Logging
import org.apache.spark.serializer.Serializer
import org.apache.spark.util.Utils
/**
* Stores BlockManager blocks on disk.
*/
private class DiskStore(blockManager: BlockManager, diskManager: DiskBlockManager)
extends BlockStore(blockManager) with Logging {
override def getSize(blockId: BlockId): Long = {
diskManager.getBlockLocation(blockId).length
}
override def putBytes(blockId: BlockId, _bytes: ByteBuffer, level: StorageLevel) {
// So that we do not modify the input offsets !
// duplicate does not copy buffer, so inexpensive
val bytes = _bytes.duplicate()
logDebug("Attempting to put block " + blockId)
val startTime = System.currentTimeMillis
val file = diskManager.getFile(blockId)
val channel = new FileOutputStream(file).getChannel()
while (bytes.remaining > 0) {
channel.write(bytes)
}
channel.close()
val finishTime = System.currentTimeMillis
logDebug("Block %s stored as %s file on disk in %d ms".format(
file.getName, Utils.bytesToString(bytes.limit), (finishTime - startTime)))
}
override def putValues(
blockId: BlockId,
values: ArrayBuffer[Any],
level: StorageLevel,
returnValues: Boolean)
: PutResult = {
logDebug("Attempting to write values for block " + blockId)
val startTime = System.currentTimeMillis
val file = diskManager.getFile(blockId)
val outputStream = new FileOutputStream(file)
blockManager.dataSerializeStream(blockId, outputStream, values.iterator)
val length = file.length
val timeTaken = System.currentTimeMillis - startTime
logDebug("Block %s stored as %s file on disk in %d ms".format(
file.getName, Utils.bytesToString(length), timeTaken))
if (returnValues) {
// Return a byte buffer for the contents of the file
val buffer = getBytes(blockId).get
PutResult(length, Right(buffer))
} else {
PutResult(length, null)
}
}
override def getBytes(blockId: BlockId): Option[ByteBuffer] = {
val segment = diskManager.getBlockLocation(blockId)
val channel = new RandomAccessFile(segment.file, "r").getChannel()
val buffer = try {
channel.map(MapMode.READ_ONLY, segment.offset, segment.length)
} finally {
channel.close()
}
Some(buffer)
}
override def getValues(blockId: BlockId): Option[Iterator[Any]] = {
getBytes(blockId).map(buffer => blockManager.dataDeserialize(blockId, buffer))
}
/**
* A version of getValues that allows a custom serializer. This is used as part of the
* shuffle short-circuit code.
*/
def getValues(blockId: BlockId, serializer: Serializer): Option[Iterator[Any]] = {
getBytes(blockId).map(bytes => blockManager.dataDeserialize(blockId, bytes, serializer))
}
override def remove(blockId: BlockId): Boolean = {
val fileSegment = diskManager.getBlockLocation(blockId)
val file = fileSegment.file
if (file.exists() && file.length() == fileSegment.length) {
file.delete()
} else {
if (fileSegment.length < file.length()) {
logWarning("Could not delete block associated with only a part of a file: " + blockId)
}
false
}
}
override def contains(blockId: BlockId): Boolean = {
val file = diskManager.getBlockLocation(blockId).file
file.exists()
}
}
|