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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
|
package spark.storage
import java.io.{File, FileOutputStream, OutputStream, RandomAccessFile}
import java.nio.ByteBuffer
import java.nio.channels.FileChannel
import java.nio.channels.FileChannel.MapMode
import java.util.{Random, Date}
import java.text.SimpleDateFormat
import scala.collection.mutable.ArrayBuffer
import it.unimi.dsi.fastutil.io.FastBufferedOutputStream
import spark.Utils
import spark.executor.ExecutorExitCode
import spark.serializer.{Serializer, SerializationStream}
import spark.Logging
import spark.network.netty.ShuffleSender
import spark.network.netty.PathResolver
/**
* Stores BlockManager blocks on disk.
*/
private class DiskStore(blockManager: BlockManager, rootDirs: String)
extends BlockStore(blockManager) with Logging {
class DiskBlockObjectWriter(blockId: String, serializer: Serializer, bufferSize: Int)
extends BlockObjectWriter(blockId) {
private val f: File = createFile(blockId /*, allowAppendExisting */)
// The file channel, used for repositioning / truncating the file.
private var channel: FileChannel = null
private var bs: OutputStream = null
private var objOut: SerializationStream = null
private var lastValidPosition = 0L
override def open(): DiskBlockObjectWriter = {
val fos = new FileOutputStream(f, true)
channel = fos.getChannel()
bs = blockManager.wrapForCompression(blockId, new FastBufferedOutputStream(fos))
objOut = serializer.newInstance().serializeStream(bs)
this
}
override def close() {
objOut.close()
bs.close()
channel = null
bs = null
objOut = null
// Invoke the close callback handler.
super.close()
}
override def isOpen: Boolean = objOut != null
// Flush the partial writes, and set valid length to be the length of the entire file.
// Return the number of bytes written for this commit.
override def commit(): Long = {
// NOTE: Flush the serializer first and then the compressed/buffered output stream
objOut.flush()
bs.flush()
val prevPos = lastValidPosition
lastValidPosition = channel.position()
lastValidPosition - prevPos
}
override def revertPartialWrites() {
// Discard current writes. We do this by flushing the outstanding writes and
// truncate the file to the last valid position.
bs.flush()
channel.truncate(lastValidPosition)
}
override def write(value: Any) {
objOut.writeObject(value)
}
override def size(): Long = lastValidPosition
}
val MAX_DIR_CREATION_ATTEMPTS: Int = 10
val subDirsPerLocalDir = System.getProperty("spark.diskStore.subDirectories", "64").toInt
var shuffleSender : ShuffleSender = null
// Create one local directory for each path mentioned in spark.local.dir; then, inside this
// directory, create multiple subdirectories that we will hash files into, in order to avoid
// having really large inodes at the top level.
val localDirs = createLocalDirs()
val subDirs = Array.fill(localDirs.length)(new Array[File](subDirsPerLocalDir))
addShutdownHook()
def getBlockWriter(blockId: String, serializer: Serializer, bufferSize: Int)
: BlockObjectWriter = {
new DiskBlockObjectWriter(blockId, serializer, bufferSize)
}
override def getSize(blockId: String): Long = {
getFile(blockId).length()
}
override def putBytes(blockId: String, _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 = createFile(blockId)
val channel = new RandomAccessFile(file, "rw").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(
blockId, Utils.memoryBytesToString(bytes.limit), (finishTime - startTime)))
}
private def getFileBytes(file: File): ByteBuffer = {
val length = file.length()
val channel = new RandomAccessFile(file, "r").getChannel()
val buffer = try {
channel.map(MapMode.READ_ONLY, 0, length)
} finally {
channel.close()
}
buffer
}
override def putValues(
blockId: String,
values: ArrayBuffer[Any],
level: StorageLevel,
returnValues: Boolean)
: PutResult = {
logDebug("Attempting to write values for block " + blockId)
val startTime = System.currentTimeMillis
val file = createFile(blockId)
val fileOut = blockManager.wrapForCompression(blockId,
new FastBufferedOutputStream(new FileOutputStream(file)))
val objOut = blockManager.defaultSerializer.newInstance().serializeStream(fileOut)
objOut.writeAll(values.iterator)
objOut.close()
val length = file.length()
val timeTaken = System.currentTimeMillis - startTime
logDebug("Block %s stored as %s file on disk in %d ms".format(
blockId, Utils.memoryBytesToString(length), timeTaken))
if (returnValues) {
// Return a byte buffer for the contents of the file
val buffer = getFileBytes(file)
PutResult(length, Right(buffer))
} else {
PutResult(length, null)
}
}
override def getBytes(blockId: String): Option[ByteBuffer] = {
val file = getFile(blockId)
val bytes = getFileBytes(file)
Some(bytes)
}
override def getValues(blockId: String): Option[Iterator[Any]] = {
getBytes(blockId).map(bytes => blockManager.dataDeserialize(blockId, bytes))
}
/**
* A version of getValues that allows a custom serializer. This is used as part of the
* shuffle short-circuit code.
*/
def getValues(blockId: String, serializer: Serializer): Option[Iterator[Any]] = {
getBytes(blockId).map(bytes => blockManager.dataDeserialize(blockId, bytes, serializer))
}
override def remove(blockId: String): Boolean = {
val file = getFile(blockId)
if (file.exists()) {
file.delete()
} else {
false
}
}
override def contains(blockId: String): Boolean = {
getFile(blockId).exists()
}
private def createFile(blockId: String, allowAppendExisting: Boolean = false): File = {
val file = getFile(blockId)
if (!allowAppendExisting && file.exists()) {
throw new Exception("File for block " + blockId + " already exists on disk: " + file)
}
file
}
private def getFile(blockId: String): File = {
logDebug("Getting file for block " + blockId)
// Figure out which local directory it hashes to, and which subdirectory in that
val hash = math.abs(blockId.hashCode)
val dirId = hash % localDirs.length
val subDirId = (hash / localDirs.length) % subDirsPerLocalDir
// Create the subdirectory if it doesn't already exist
var subDir = subDirs(dirId)(subDirId)
if (subDir == null) {
subDir = subDirs(dirId).synchronized {
val old = subDirs(dirId)(subDirId)
if (old != null) {
old
} else {
val newDir = new File(localDirs(dirId), "%02x".format(subDirId))
newDir.mkdir()
subDirs(dirId)(subDirId) = newDir
newDir
}
}
}
new File(subDir, blockId)
}
private def createLocalDirs(): Array[File] = {
logDebug("Creating local directories at root dirs '" + rootDirs + "'")
val dateFormat = new SimpleDateFormat("yyyyMMddHHmmss")
rootDirs.split(",").map(rootDir => {
var foundLocalDir: Boolean = false
var localDir: File = null
var localDirId: String = null
var tries = 0
val rand = new Random()
while (!foundLocalDir && tries < MAX_DIR_CREATION_ATTEMPTS) {
tries += 1
try {
localDirId = "%s-%04x".format(dateFormat.format(new Date), rand.nextInt(65536))
localDir = new File(rootDir, "spark-local-" + localDirId)
if (!localDir.exists) {
foundLocalDir = localDir.mkdirs()
}
} catch {
case e: Exception =>
logWarning("Attempt " + tries + " to create local dir failed", e)
}
}
if (!foundLocalDir) {
logError("Failed " + MAX_DIR_CREATION_ATTEMPTS +
" attempts to create local dir in " + rootDir)
System.exit(ExecutorExitCode.DISK_STORE_FAILED_TO_CREATE_DIR)
}
logInfo("Created local directory at " + localDir)
localDir
})
}
private def addShutdownHook() {
localDirs.foreach(localDir => Utils.registerShutdownDeleteDir(localDir))
Runtime.getRuntime.addShutdownHook(new Thread("delete Spark local dirs") {
override def run() {
logDebug("Shutdown hook called")
try {
localDirs.foreach { localDir =>
if (!Utils.hasRootAsShutdownDeleteDir(localDir)) Utils.deleteRecursively(localDir)
}
if (shuffleSender != null) {
shuffleSender.stop
}
} catch {
case t: Throwable => logError("Exception while deleting local spark dirs", t)
}
}
})
}
private[storage] def startShuffleBlockSender(port: Int): Int = {
val pResolver = new PathResolver {
override def getAbsolutePath(blockId: String): String = {
if (!blockId.startsWith("shuffle_")) {
return null
}
DiskStore.this.getFile(blockId).getAbsolutePath()
}
}
shuffleSender = new ShuffleSender(port, pResolver)
logInfo("Created ShuffleSender binding to port : "+ shuffleSender.port)
shuffleSender.port
}
}
|