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package spark
import java.io._
import java.net.{InetAddress, URL, URI}
import java.util.{Locale, UUID}
import java.util.concurrent.{Executors, ThreadFactory, ThreadPoolExecutor}
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.{Path, FileSystem, FileUtil}
import scala.collection.mutable.ArrayBuffer
import scala.util.Random
import scala.io.Source
/**
* Various utility methods used by 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()
return 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)
return 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)
}
return ois.readObject.asInstanceOf[T]
}
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
}
}
return buf
}
/** 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 after " + maxAttempts +
" attempts!")
}
try {
dir = new File(root, "spark-" + UUID.randomUUID.toString)
if (dir.exists() || !dir.mkdirs()) {
dir = null
}
} catch { case e: IOException => ; }
}
// 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() {
Utils.deleteRecursively(dir)
}
})
return 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()
}
}
/** Copy a file on the local file system */
def copyFile(source: File, dest: File) {
val in = new FileInputStream(source)
val out = new FileOutputStream(dest)
copyStream(in, out, true)
}
/* Download a file from a given URL to the local filesystem */
def downloadFile(url: URL, localPath: String) {
val in = url.openStream()
val out = new FileOutputStream(localPath)
Utils.copyStream(in, out, true)
}
/**
* 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.
*/
def fetchFile(url: String, targetDir: File) {
val filename = url.split("/").last
val targetFile = new File(targetDir, filename)
val uri = new URI(url)
uri.getScheme match {
case "http" | "https" | "ftp" =>
logInfo("Fetching " + url + " to " + targetFile)
val in = new URL(url).openStream()
val out = new FileOutputStream(targetFile)
Utils.copyStream(in, out, true)
case "file" | null =>
// Remove the file if it already exists
targetFile.delete()
// Symlink the file locally
logInfo("Symlinking " + url + " to " + targetFile)
FileUtil.symLink(url, targetFile.toString)
case _ =>
// Use the Hadoop filesystem library, which supports file://, hdfs://, s3://, and others
val uri = new URI(url)
val conf = new Configuration()
val fs = FileSystem.get(uri, conf)
val in = fs.open(new Path(uri))
val out = new FileOutputStream(targetFile)
Utils.copyStream(in, out, true)
}
// 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(filename, "a+x")
}
/**
* 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](seq: TraversableOnce[T]): Seq[T] = {
val buf = new ArrayBuffer[T]()
buf ++= seq
val rand = new Random()
for (i <- (buf.size - 1) to 1 by -1) {
val j = rand.nextInt(i)
val tmp = buf(j)
buf(j) = buf(i)
buf(i) = tmp
}
buf
}
/**
* Get the local host's IP address in dotted-quad format (e.g. 1.2.3.4).
*/
def localIpAddress(): String = InetAddress.getLocalHost.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) {
customHostname = Some(hostname)
}
/**
* Get the local machine's hostname.
*/
def localHostName(): String = {
customHostname.getOrElse(InetAddress.getLocalHost.getHostName)
}
/**
* Returns a standard ThreadFactory except all threads are daemons.
*/
private def newDaemonThreadFactory: ThreadFactory = {
new ThreadFactory {
def newThread(r: Runnable): Thread = {
var t = Executors.defaultThreadFactory.newThread (r)
t.setDaemon (true)
return t
}
}
}
/**
* Wrapper over newCachedThreadPool.
*/
def newDaemonCachedThreadPool(): ThreadPoolExecutor = {
var threadPool = Executors.newCachedThreadPool.asInstanceOf[ThreadPoolExecutor]
threadPool.setThreadFactory (newDaemonThreadFactory)
return threadPool
}
/**
* 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.
*/
def newDaemonFixedThreadPool(nThreads: Int): ThreadPoolExecutor = {
var threadPool = Executors.newFixedThreadPool(nThreads).asInstanceOf[ThreadPoolExecutor]
threadPool.setThreadFactory(newDaemonThreadFactory)
return threadPool
}
/**
* Delete a file or directory and its contents recursively.
*/
def deleteRecursively(file: File) {
if (file.isDirectory) {
for (child <- file.listFiles()) {
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 memory quantity in bytes to a human-readable string such as "4.0 MB".
*/
def memoryBytesToString(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)
}
/**
* Convert a memory quantity in megabytes to a human-readable string such as "4.0 MB".
*/
def memoryMegabytesToString(megabytes: Long): String = {
memoryBytesToString(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("."))
}
}
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