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
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
|
/*
* 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.util
import java.io._
import java.net.{InetAddress, Inet4Address, NetworkInterface, URI, URL}
import java.nio.ByteBuffer
import java.util.{Locale, Random, UUID}
import java.util.concurrent.{ConcurrentHashMap, Executors, ThreadPoolExecutor}
import scala.collection.JavaConversions._
import scala.collection.Map
import scala.collection.mutable.ArrayBuffer
import scala.io.Source
import scala.reflect.ClassTag
import com.google.common.io.Files
import com.google.common.util.concurrent.ThreadFactoryBuilder
import org.apache.hadoop.fs.{FileSystem, FileUtil, Path}
import org.apache.spark.{Logging, SparkConf, SparkException}
import org.apache.spark.serializer.{DeserializationStream, SerializationStream, SerializerInstance}
import org.apache.spark.deploy.SparkHadoopUtil
/**
* Various utility methods used by Spark.
*/
private[spark] object Utils extends Logging {
/** Serialize an object using Java serialization */
def serialize[T](o: T): Array[Byte] = {
val bos = new ByteArrayOutputStream()
val oos = new ObjectOutputStream(bos)
oos.writeObject(o)
oos.close()
bos.toByteArray
}
/** Deserialize an object using Java serialization */
def deserialize[T](bytes: Array[Byte]): T = {
val bis = new ByteArrayInputStream(bytes)
val ois = new ObjectInputStream(bis)
ois.readObject.asInstanceOf[T]
}
/** Deserialize an object using Java serialization and the given ClassLoader */
def deserialize[T](bytes: Array[Byte], loader: ClassLoader): T = {
val bis = new ByteArrayInputStream(bytes)
val ois = new ObjectInputStream(bis) {
override def resolveClass(desc: ObjectStreamClass) =
Class.forName(desc.getName, false, loader)
}
ois.readObject.asInstanceOf[T]
}
/** Deserialize a Long value (used for {@link org.apache.spark.api.python.PythonPartitioner}) */
def deserializeLongValue(bytes: Array[Byte]) : Long = {
// Note: we assume that we are given a Long value encoded in network (big-endian) byte order
var result = bytes(7) & 0xFFL
result = result + ((bytes(6) & 0xFFL) << 8)
result = result + ((bytes(5) & 0xFFL) << 16)
result = result + ((bytes(4) & 0xFFL) << 24)
result = result + ((bytes(3) & 0xFFL) << 32)
result = result + ((bytes(2) & 0xFFL) << 40)
result = result + ((bytes(1) & 0xFFL) << 48)
result + ((bytes(0) & 0xFFL) << 56)
}
/** Serialize via nested stream using specific serializer */
def serializeViaNestedStream(os: OutputStream, ser: SerializerInstance)(
f: SerializationStream => Unit) = {
val osWrapper = ser.serializeStream(new OutputStream {
def write(b: Int) = os.write(b)
override def write(b: Array[Byte], off: Int, len: Int) = os.write(b, off, len)
})
try {
f(osWrapper)
} finally {
osWrapper.close()
}
}
/** Deserialize via nested stream using specific serializer */
def deserializeViaNestedStream(is: InputStream, ser: SerializerInstance)(
f: DeserializationStream => Unit) = {
val isWrapper = ser.deserializeStream(new InputStream {
def read(): Int = is.read()
override def read(b: Array[Byte], off: Int, len: Int): Int = is.read(b, off, len)
})
try {
f(isWrapper)
} finally {
isWrapper.close()
}
}
/**
* Primitive often used when writing {@link java.nio.ByteBuffer} to {@link java.io.DataOutput}.
*/
def writeByteBuffer(bb: ByteBuffer, out: ObjectOutput) = {
if (bb.hasArray) {
out.write(bb.array(), bb.arrayOffset() + bb.position(), bb.remaining())
} else {
val bbval = new Array[Byte](bb.remaining())
bb.get(bbval)
out.write(bbval)
}
}
def isAlpha(c: Char): Boolean = {
(c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')
}
/** Split a string into words at non-alphabetic characters */
def splitWords(s: String): Seq[String] = {
val buf = new ArrayBuffer[String]
var i = 0
while (i < s.length) {
var j = i
while (j < s.length && isAlpha(s.charAt(j))) {
j += 1
}
if (j > i) {
buf += s.substring(i, j)
}
i = j
while (i < s.length && !isAlpha(s.charAt(i))) {
i += 1
}
}
buf
}
private val shutdownDeletePaths = new scala.collection.mutable.HashSet[String]()
// Register the path to be deleted via shutdown hook
def registerShutdownDeleteDir(file: File) {
val absolutePath = file.getAbsolutePath()
shutdownDeletePaths.synchronized {
shutdownDeletePaths += absolutePath
}
}
// Is the path already registered to be deleted via a shutdown hook ?
def hasShutdownDeleteDir(file: File): Boolean = {
val absolutePath = file.getAbsolutePath()
shutdownDeletePaths.synchronized {
shutdownDeletePaths.contains(absolutePath)
}
}
// Note: if file is child of some registered path, while not equal to it, then return true;
// else false. This is to ensure that two shutdown hooks do not try to delete each others
// paths - resulting in IOException and incomplete cleanup.
def hasRootAsShutdownDeleteDir(file: File): Boolean = {
val absolutePath = file.getAbsolutePath()
val retval = shutdownDeletePaths.synchronized {
shutdownDeletePaths.find { path =>
!absolutePath.equals(path) && absolutePath.startsWith(path)
}.isDefined
}
if (retval) {
logInfo("path = " + file + ", already present as root for deletion.")
}
retval
}
/** Create a temporary directory inside the given parent directory */
def createTempDir(root: String = System.getProperty("java.io.tmpdir")): File = {
var attempts = 0
val maxAttempts = 10
var dir: File = null
while (dir == null) {
attempts += 1
if (attempts > maxAttempts) {
throw new IOException("Failed to create a temp directory (under " + root + ") after " +
maxAttempts + " attempts!")
}
try {
dir = new File(root, "spark-" + UUID.randomUUID.toString)
if (dir.exists() || !dir.mkdirs()) {
dir = null
}
} catch { case e: IOException => ; }
}
registerShutdownDeleteDir(dir)
// Add a shutdown hook to delete the temp dir when the JVM exits
Runtime.getRuntime.addShutdownHook(new Thread("delete Spark temp dir " + dir) {
override def run() {
// Attempt to delete if some patch which is parent of this is not already registered.
if (! hasRootAsShutdownDeleteDir(dir)) Utils.deleteRecursively(dir)
}
})
dir
}
/** Copy all data from an InputStream to an OutputStream */
def copyStream(in: InputStream,
out: OutputStream,
closeStreams: Boolean = false)
{
val buf = new Array[Byte](8192)
var n = 0
while (n != -1) {
n = in.read(buf)
if (n != -1) {
out.write(buf, 0, n)
}
}
if (closeStreams) {
in.close()
out.close()
}
}
/**
* Download a file requested by the executor. Supports fetching the file in a variety of ways,
* including HTTP, HDFS and files on a standard filesystem, based on the URL parameter.
*
* Throws SparkException if the target file already exists and has different contents than
* the requested file.
*/
def fetchFile(url: String, targetDir: File, conf: SparkConf) {
val filename = url.split("/").last
val tempDir = getLocalDir(conf)
val tempFile = File.createTempFile("fetchFileTemp", null, new File(tempDir))
val targetFile = new File(targetDir, filename)
val uri = new URI(url)
val fileOverwrite = conf.getBoolean("spark.files.overwrite", false)
uri.getScheme match {
case "http" | "https" | "ftp" =>
logInfo("Fetching " + url + " to " + tempFile)
val in = new URL(url).openStream()
val out = new FileOutputStream(tempFile)
Utils.copyStream(in, out, true)
if (targetFile.exists && !Files.equal(tempFile, targetFile)) {
if (fileOverwrite) {
targetFile.delete()
logInfo(("File %s exists and does not match contents of %s, " +
"replacing it with %s").format(targetFile, url, url))
} else {
tempFile.delete()
throw new SparkException(
"File " + targetFile + " exists and does not match contents of" + " " + url)
}
}
Files.move(tempFile, targetFile)
case "file" | null =>
// In the case of a local file, copy the local file to the target directory.
// Note the difference between uri vs url.
val sourceFile = if (uri.isAbsolute) new File(uri) else new File(url)
var shouldCopy = true
if (targetFile.exists) {
if (!Files.equal(sourceFile, targetFile)) {
if (fileOverwrite) {
targetFile.delete()
logInfo(("File %s exists and does not match contents of %s, " +
"replacing it with %s").format(targetFile, url, url))
} else {
throw new SparkException(
"File " + targetFile + " exists and does not match contents of" + " " + url)
}
} else {
// Do nothing if the file contents are the same, i.e. this file has been copied
// previously.
logInfo(sourceFile.getAbsolutePath + " has been previously copied to "
+ targetFile.getAbsolutePath)
shouldCopy = false
}
}
if (shouldCopy) {
// The file does not exist in the target directory. Copy it there.
logInfo("Copying " + sourceFile.getAbsolutePath + " to " + targetFile.getAbsolutePath)
Files.copy(sourceFile, targetFile)
}
case _ =>
// Use the Hadoop filesystem library, which supports file://, hdfs://, s3://, and others
val conf = SparkHadoopUtil.get.newConfiguration()
val fs = FileSystem.get(uri, conf)
val in = fs.open(new Path(uri))
val out = new FileOutputStream(tempFile)
Utils.copyStream(in, out, true)
if (targetFile.exists && !Files.equal(tempFile, targetFile)) {
if (fileOverwrite) {
targetFile.delete()
logInfo(("File %s exists and does not match contents of %s, " +
"replacing it with %s").format(targetFile, url, url))
} else {
tempFile.delete()
throw new SparkException(
"File " + targetFile + " exists and does not match contents of" + " " + url)
}
}
Files.move(tempFile, targetFile)
}
// Decompress the file if it's a .tar or .tar.gz
if (filename.endsWith(".tar.gz") || filename.endsWith(".tgz")) {
logInfo("Untarring " + filename)
Utils.execute(Seq("tar", "-xzf", filename), targetDir)
} else if (filename.endsWith(".tar")) {
logInfo("Untarring " + filename)
Utils.execute(Seq("tar", "-xf", filename), targetDir)
}
// Make the file executable - That's necessary for scripts
FileUtil.chmod(targetFile.getAbsolutePath, "a+x")
}
/**
* Get a temporary directory using Spark's spark.local.dir property, if set. This will always
* return a single directory, even though the spark.local.dir property might be a list of
* multiple paths.
*/
def getLocalDir(conf: SparkConf): String = {
conf.get("spark.local.dir", System.getProperty("java.io.tmpdir")).split(',')(0)
}
/**
* Shuffle the elements of a collection into a random order, returning the
* result in a new collection. Unlike scala.util.Random.shuffle, this method
* uses a local random number generator, avoiding inter-thread contention.
*/
def randomize[T: ClassTag](seq: TraversableOnce[T]): Seq[T] = {
randomizeInPlace(seq.toArray)
}
/**
* Shuffle the elements of an array into a random order, modifying the
* original array. Returns the original array.
*/
def randomizeInPlace[T](arr: Array[T], rand: Random = new Random): Array[T] = {
for (i <- (arr.length - 1) to 1 by -1) {
val j = rand.nextInt(i)
val tmp = arr(j)
arr(j) = arr(i)
arr(i) = tmp
}
arr
}
/**
* Get the local host's IP address in dotted-quad format (e.g. 1.2.3.4).
* Note, this is typically not used from within core spark.
*/
lazy val localIpAddress: String = findLocalIpAddress()
lazy val localIpAddressHostname: String = getAddressHostName(localIpAddress)
private def findLocalIpAddress(): String = {
val defaultIpOverride = System.getenv("SPARK_LOCAL_IP")
if (defaultIpOverride != null) {
defaultIpOverride
} else {
val address = InetAddress.getLocalHost
if (address.isLoopbackAddress) {
// Address resolves to something like 127.0.1.1, which happens on Debian; try to find
// a better address using the local network interfaces
for (ni <- NetworkInterface.getNetworkInterfaces) {
for (addr <- ni.getInetAddresses if !addr.isLinkLocalAddress &&
!addr.isLoopbackAddress && addr.isInstanceOf[Inet4Address]) {
// We've found an address that looks reasonable!
logWarning("Your hostname, " + InetAddress.getLocalHost.getHostName + " resolves to" +
" a loopback address: " + address.getHostAddress + "; using " + addr.getHostAddress +
" instead (on interface " + ni.getName + ")")
logWarning("Set SPARK_LOCAL_IP if you need to bind to another address")
return addr.getHostAddress
}
}
logWarning("Your hostname, " + InetAddress.getLocalHost.getHostName + " resolves to" +
" a loopback address: " + address.getHostAddress + ", but we couldn't find any" +
" external IP address!")
logWarning("Set SPARK_LOCAL_IP if you need to bind to another address")
}
address.getHostAddress
}
}
private var customHostname: Option[String] = None
/**
* Allow setting a custom host name because when we run on Mesos we need to use the same
* hostname it reports to the master.
*/
def setCustomHostname(hostname: String) {
// DEBUG code
Utils.checkHost(hostname)
customHostname = Some(hostname)
}
/**
* Get the local machine's hostname.
*/
def localHostName(): String = {
customHostname.getOrElse(localIpAddressHostname)
}
def getAddressHostName(address: String): String = {
InetAddress.getByName(address).getHostName
}
def checkHost(host: String, message: String = "") {
assert(host.indexOf(':') == -1, message)
}
def checkHostPort(hostPort: String, message: String = "") {
assert(hostPort.indexOf(':') != -1, message)
}
// Typically, this will be of order of number of nodes in cluster
// If not, we should change it to LRUCache or something.
private val hostPortParseResults = new ConcurrentHashMap[String, (String, Int)]()
def parseHostPort(hostPort: String): (String, Int) = {
{
// Check cache first.
val cached = hostPortParseResults.get(hostPort)
if (cached != null) return cached
}
val indx: Int = hostPort.lastIndexOf(':')
// This is potentially broken - when dealing with ipv6 addresses for example, sigh ...
// but then hadoop does not support ipv6 right now.
// For now, we assume that if port exists, then it is valid - not check if it is an int > 0
if (-1 == indx) {
val retval = (hostPort, 0)
hostPortParseResults.put(hostPort, retval)
return retval
}
val retval = (hostPort.substring(0, indx).trim(), hostPort.substring(indx + 1).trim().toInt)
hostPortParseResults.putIfAbsent(hostPort, retval)
hostPortParseResults.get(hostPort)
}
private val daemonThreadFactoryBuilder: ThreadFactoryBuilder =
new ThreadFactoryBuilder().setDaemon(true)
/**
* Wrapper over newCachedThreadPool. Thread names are formatted as prefix-ID, where ID is a
* unique, sequentially assigned integer.
*/
def newDaemonCachedThreadPool(prefix: String): ThreadPoolExecutor = {
val threadFactory = daemonThreadFactoryBuilder.setNameFormat(prefix + "-%d").build()
Executors.newCachedThreadPool(threadFactory).asInstanceOf[ThreadPoolExecutor]
}
/**
* Return the string to tell how long has passed in seconds. The passing parameter should be in
* millisecond.
*/
def getUsedTimeMs(startTimeMs: Long): String = {
return " " + (System.currentTimeMillis - startTimeMs) + " ms"
}
/**
* Wrapper over newFixedThreadPool. Thread names are formatted as prefix-ID, where ID is a
* unique, sequentially assigned integer.
*/
def newDaemonFixedThreadPool(nThreads: Int, prefix: String): ThreadPoolExecutor = {
val threadFactory = daemonThreadFactoryBuilder.setNameFormat(prefix + "-%d").build()
Executors.newFixedThreadPool(nThreads, threadFactory).asInstanceOf[ThreadPoolExecutor]
}
private def listFilesSafely(file: File): Seq[File] = {
val files = file.listFiles()
if (files == null) {
throw new IOException("Failed to list files for dir: " + file)
}
files
}
/**
* Delete a file or directory and its contents recursively.
*/
def deleteRecursively(file: File) {
if (file.isDirectory) {
for (child <- listFilesSafely(file)) {
deleteRecursively(child)
}
}
if (!file.delete()) {
throw new IOException("Failed to delete: " + file)
}
}
/**
* Convert a Java memory parameter passed to -Xmx (such as 300m or 1g) to a number of megabytes.
* This is used to figure out how much memory to claim from Mesos based on the SPARK_MEM
* environment variable.
*/
def memoryStringToMb(str: String): Int = {
val lower = str.toLowerCase
if (lower.endsWith("k")) {
(lower.substring(0, lower.length-1).toLong / 1024).toInt
} else if (lower.endsWith("m")) {
lower.substring(0, lower.length-1).toInt
} else if (lower.endsWith("g")) {
lower.substring(0, lower.length-1).toInt * 1024
} else if (lower.endsWith("t")) {
lower.substring(0, lower.length-1).toInt * 1024 * 1024
} else {// no suffix, so it's just a number in bytes
(lower.toLong / 1024 / 1024).toInt
}
}
/**
* Convert a quantity in bytes to a human-readable string such as "4.0 MB".
*/
def bytesToString(size: Long): String = {
val TB = 1L << 40
val GB = 1L << 30
val MB = 1L << 20
val KB = 1L << 10
val (value, unit) = {
if (size >= 2*TB) {
(size.asInstanceOf[Double] / TB, "TB")
} else if (size >= 2*GB) {
(size.asInstanceOf[Double] / GB, "GB")
} else if (size >= 2*MB) {
(size.asInstanceOf[Double] / MB, "MB")
} else if (size >= 2*KB) {
(size.asInstanceOf[Double] / KB, "KB")
} else {
(size.asInstanceOf[Double], "B")
}
}
"%.1f %s".formatLocal(Locale.US, value, unit)
}
/**
* Returns a human-readable string representing a duration such as "35ms"
*/
def msDurationToString(ms: Long): String = {
val second = 1000
val minute = 60 * second
val hour = 60 * minute
ms match {
case t if t < second =>
"%d ms".format(t)
case t if t < minute =>
"%.1f s".format(t.toFloat / second)
case t if t < hour =>
"%.1f m".format(t.toFloat / minute)
case t =>
"%.2f h".format(t.toFloat / hour)
}
}
/**
* Convert a quantity in megabytes to a human-readable string such as "4.0 MB".
*/
def megabytesToString(megabytes: Long): String = {
bytesToString(megabytes * 1024L * 1024L)
}
/**
* Execute a command in the given working directory, throwing an exception if it completes
* with an exit code other than 0.
*/
def execute(command: Seq[String], workingDir: File) {
val process = new ProcessBuilder(command: _*)
.directory(workingDir)
.redirectErrorStream(true)
.start()
new Thread("read stdout for " + command(0)) {
override def run() {
for (line <- Source.fromInputStream(process.getInputStream).getLines) {
System.err.println(line)
}
}
}.start()
val exitCode = process.waitFor()
if (exitCode != 0) {
throw new SparkException("Process " + command + " exited with code " + exitCode)
}
}
/**
* Execute a command in the current working directory, throwing an exception if it completes
* with an exit code other than 0.
*/
def execute(command: Seq[String]) {
execute(command, new File("."))
}
/**
* Execute a command and get its output, throwing an exception if it yields a code other than 0.
*/
def executeAndGetOutput(command: Seq[String], workingDir: File = new File("."),
extraEnvironment: Map[String, String] = Map.empty): String = {
val builder = new ProcessBuilder(command: _*)
.directory(workingDir)
val environment = builder.environment()
for ((key, value) <- extraEnvironment) {
environment.put(key, value)
}
val process = builder.start()
new Thread("read stderr for " + command(0)) {
override def run() {
for (line <- Source.fromInputStream(process.getErrorStream).getLines) {
System.err.println(line)
}
}
}.start()
val output = new StringBuffer
val stdoutThread = new Thread("read stdout for " + command(0)) {
override def run() {
for (line <- Source.fromInputStream(process.getInputStream).getLines) {
output.append(line)
}
}
}
stdoutThread.start()
val exitCode = process.waitFor()
stdoutThread.join() // Wait for it to finish reading output
if (exitCode != 0) {
throw new SparkException("Process " + command + " exited with code " + exitCode)
}
output.toString
}
/**
* A regular expression to match classes of the "core" Spark API that we want to skip when
* finding the call site of a method.
*/
private val SPARK_CLASS_REGEX = """^org\.apache\.spark(\.api\.java)?(\.util)?(\.rdd)?\.[A-Z]""".r
private[spark] class CallSiteInfo(val lastSparkMethod: String, val firstUserFile: String,
val firstUserLine: Int, val firstUserClass: String)
/**
* When called inside a class in the spark package, returns the name of the user code class
* (outside the spark package) that called into Spark, as well as which Spark method they called.
* This is used, for example, to tell users where in their code each RDD got created.
*/
def getCallSiteInfo: CallSiteInfo = {
val trace = Thread.currentThread.getStackTrace().filter( el =>
(!el.getMethodName.contains("getStackTrace")))
// Keep crawling up the stack trace until we find the first function not inside of the spark
// package. We track the last (shallowest) contiguous Spark method. This might be an RDD
// transformation, a SparkContext function (such as parallelize), or anything else that leads
// to instantiation of an RDD. We also track the first (deepest) user method, file, and line.
var lastSparkMethod = "<unknown>"
var firstUserFile = "<unknown>"
var firstUserLine = 0
var finished = false
var firstUserClass = "<unknown>"
for (el <- trace) {
if (!finished) {
if (SPARK_CLASS_REGEX.findFirstIn(el.getClassName).isDefined) {
lastSparkMethod = if (el.getMethodName == "<init>") {
// Spark method is a constructor; get its class name
el.getClassName.substring(el.getClassName.lastIndexOf('.') + 1)
} else {
el.getMethodName
}
}
else {
firstUserLine = el.getLineNumber
firstUserFile = el.getFileName
firstUserClass = el.getClassName
finished = true
}
}
}
new CallSiteInfo(lastSparkMethod, firstUserFile, firstUserLine, firstUserClass)
}
def formatSparkCallSite = {
val callSiteInfo = getCallSiteInfo
"%s at %s:%s".format(callSiteInfo.lastSparkMethod, callSiteInfo.firstUserFile,
callSiteInfo.firstUserLine)
}
/** Return a string containing part of a file from byte 'start' to 'end'. */
def offsetBytes(path: String, start: Long, end: Long): String = {
val file = new File(path)
val length = file.length()
val effectiveEnd = math.min(length, end)
val effectiveStart = math.max(0, start)
val buff = new Array[Byte]((effectiveEnd-effectiveStart).toInt)
val stream = new FileInputStream(file)
stream.skip(effectiveStart)
stream.read(buff)
stream.close()
Source.fromBytes(buff).mkString
}
/**
* Clone an object using a Spark serializer.
*/
def clone[T](value: T, serializer: SerializerInstance): T = {
serializer.deserialize[T](serializer.serialize(value))
}
/**
* Detect whether this thread might be executing a shutdown hook. Will always return true if
* the current thread is a running a shutdown hook but may spuriously return true otherwise (e.g.
* if System.exit was just called by a concurrent thread).
*
* Currently, this detects whether the JVM is shutting down by Runtime#addShutdownHook throwing
* an IllegalStateException.
*/
def inShutdown(): Boolean = {
try {
val hook = new Thread {
override def run() {}
}
Runtime.getRuntime.addShutdownHook(hook)
Runtime.getRuntime.removeShutdownHook(hook)
} catch {
case ise: IllegalStateException => return true
}
false
}
def isSpace(c: Char): Boolean = {
" \t\r\n".indexOf(c) != -1
}
/**
* Split a string of potentially quoted arguments from the command line the way that a shell
* would do it to determine arguments to a command. For example, if the string is 'a "b c" d',
* then it would be parsed as three arguments: 'a', 'b c' and 'd'.
*/
def splitCommandString(s: String): Seq[String] = {
val buf = new ArrayBuffer[String]
var inWord = false
var inSingleQuote = false
var inDoubleQuote = false
val curWord = new StringBuilder
def endWord() {
buf += curWord.toString
curWord.clear()
}
var i = 0
while (i < s.length) {
var nextChar = s.charAt(i)
if (inDoubleQuote) {
if (nextChar == '"') {
inDoubleQuote = false
} else if (nextChar == '\\') {
if (i < s.length - 1) {
// Append the next character directly, because only " and \ may be escaped in
// double quotes after the shell's own expansion
curWord.append(s.charAt(i + 1))
i += 1
}
} else {
curWord.append(nextChar)
}
} else if (inSingleQuote) {
if (nextChar == '\'') {
inSingleQuote = false
} else {
curWord.append(nextChar)
}
// Backslashes are not treated specially in single quotes
} else if (nextChar == '"') {
inWord = true
inDoubleQuote = true
} else if (nextChar == '\'') {
inWord = true
inSingleQuote = true
} else if (!isSpace(nextChar)) {
curWord.append(nextChar)
inWord = true
} else if (inWord && isSpace(nextChar)) {
endWord()
inWord = false
}
i += 1
}
if (inWord || inDoubleQuote || inSingleQuote) {
endWord()
}
buf
}
/* Calculates 'x' modulo 'mod', takes to consideration sign of x,
* i.e. if 'x' is negative, than 'x' % 'mod' is negative too
* so function return (x % mod) + mod in that case.
*/
def nonNegativeMod(x: Int, mod: Int): Int = {
val rawMod = x % mod
rawMod + (if (rawMod < 0) mod else 0)
}
// Handles idiosyncracies with hash (add more as required)
def nonNegativeHash(obj: AnyRef): Int = {
// Required ?
if (obj eq null) return 0
val hash = obj.hashCode
// math.abs fails for Int.MinValue
val hashAbs = if (Int.MinValue != hash) math.abs(hash) else 0
// Nothing else to guard against ?
hashAbs
}
/** Returns a copy of the system properties that is thread-safe to iterator over. */
def getSystemProperties(): Map[String, String] = {
System.getProperties.clone().asInstanceOf[java.util.Properties].toMap[String, String]
}
/**
* Method executed for repeating a task for side effects.
* Unlike a for comprehension, it permits JVM JIT optimization
*/
def times(numIters: Int)(f: => Unit): Unit = {
var i = 0
while (i < numIters) {
f
i += 1
}
}
/**
* Timing method based on iterations that permit JVM JIT optimization.
* @param numIters number of iterations
* @param f function to be executed
*/
def timeIt(numIters: Int)(f: => Unit): Long = {
val start = System.currentTimeMillis
times(numIters)(f)
System.currentTimeMillis - start
}
/**
* Counts the number of elements of an iterator using a while loop rather than calling
* [[scala.collection.Iterator#size]] because it uses a for loop, which is slightly slower
* in the current version of Scala.
*/
def getIteratorSize[T](iterator: Iterator[T]): Long = {
var count = 0L
while (iterator.hasNext) {
count += 1L
iterator.next()
}
count
}
}
|