288 lines
7.9 KiB
Scala
288 lines
7.9 KiB
Scala
package spark
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import java.io._
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import java.net.InetAddress
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import java.util.concurrent.{Executors, ThreadFactory, ThreadPoolExecutor}
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import scala.collection.mutable.ArrayBuffer
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import scala.util.Random
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import java.util.{Locale, UUID}
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import scala.io.Source
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/**
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* Various utility methods used by Spark.
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*/
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object Utils {
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def serialize[T](o: T): Array[Byte] = {
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val bos = new ByteArrayOutputStream()
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val oos = new ObjectOutputStream(bos)
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oos.writeObject(o)
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oos.close()
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return bos.toByteArray
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}
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def deserialize[T](bytes: Array[Byte]): T = {
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val bis = new ByteArrayInputStream(bytes)
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val ois = new ObjectInputStream(bis)
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return ois.readObject.asInstanceOf[T]
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}
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def deserialize[T](bytes: Array[Byte], loader: ClassLoader): T = {
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val bis = new ByteArrayInputStream(bytes)
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val ois = new ObjectInputStream(bis) {
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override def resolveClass(desc: ObjectStreamClass) =
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Class.forName(desc.getName, false, loader)
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}
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return ois.readObject.asInstanceOf[T]
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}
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def isAlpha(c: Char): Boolean = {
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(c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')
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}
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/** Split a string into words at non-alphabetic characters */
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def splitWords(s: String): Seq[String] = {
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val buf = new ArrayBuffer[String]
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var i = 0
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while (i < s.length) {
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var j = i
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while (j < s.length && isAlpha(s.charAt(j))) {
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j += 1
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}
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if (j > i) {
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buf += s.substring(i, j)
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}
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i = j
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while (i < s.length && !isAlpha(s.charAt(i))) {
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i += 1
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}
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}
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return buf
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}
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/** Create a temporary directory inside the given parent directory */
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def createTempDir(root: String = System.getProperty("java.io.tmpdir")): File = {
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var attempts = 0
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val maxAttempts = 10
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var dir: File = null
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while (dir == null) {
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attempts += 1
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if (attempts > maxAttempts) {
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throw new IOException("Failed to create a temp directory after " + maxAttempts +
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" attempts!")
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}
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try {
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dir = new File(root, "spark-" + UUID.randomUUID.toString)
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if (dir.exists() || !dir.mkdirs()) {
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dir = null
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}
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} catch { case e: IOException => ; }
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}
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// Add a shutdown hook to delete the temp dir when the JVM exits
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Runtime.getRuntime.addShutdownHook(new Thread("delete Spark temp dir " + dir) {
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override def run() {
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Utils.deleteRecursively(dir)
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}
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})
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return dir
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}
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/** Copy all data from an InputStream to an OutputStream */
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def copyStream(in: InputStream,
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out: OutputStream,
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closeStreams: Boolean = false)
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{
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val buf = new Array[Byte](8192)
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var n = 0
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while (n != -1) {
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n = in.read(buf)
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if (n != -1) {
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out.write(buf, 0, n)
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}
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}
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if (closeStreams) {
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in.close()
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out.close()
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}
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}
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/**
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* Shuffle the elements of a collection into a random order, returning the
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* result in a new collection. Unlike scala.util.Random.shuffle, this method
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* uses a local random number generator, avoiding inter-thread contention.
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*/
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def randomize[T](seq: TraversableOnce[T]): Seq[T] = {
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val buf = new ArrayBuffer[T]()
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buf ++= seq
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val rand = new Random()
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for (i <- (buf.size - 1) to 1 by -1) {
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val j = rand.nextInt(i)
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val tmp = buf(j)
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buf(j) = buf(i)
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buf(i) = tmp
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}
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buf
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}
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/**
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* Get the local host's IP address in dotted-quad format (e.g. 1.2.3.4).
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*/
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def localIpAddress(): String = InetAddress.getLocalHost.getHostAddress
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private var customHostname: Option[String] = None
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/**
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* Allow setting a custom host name because when we run on Mesos we need to use the same
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* hostname it reports to the master.
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*/
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def setCustomHostname(hostname: String) {
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customHostname = Some(hostname)
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}
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/**
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* Get the local machine's hostname.
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*/
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def localHostName(): String = {
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customHostname.getOrElse(InetAddress.getLocalHost.getHostName)
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}
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/**
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* Returns a standard ThreadFactory except all threads are daemons.
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*/
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private def newDaemonThreadFactory: ThreadFactory = {
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new ThreadFactory {
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def newThread(r: Runnable): Thread = {
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var t = Executors.defaultThreadFactory.newThread (r)
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t.setDaemon (true)
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return t
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}
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}
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}
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/**
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* Wrapper over newCachedThreadPool.
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*/
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def newDaemonCachedThreadPool(): ThreadPoolExecutor = {
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var threadPool = Executors.newCachedThreadPool.asInstanceOf[ThreadPoolExecutor]
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threadPool.setThreadFactory (newDaemonThreadFactory)
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return threadPool
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}
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/**
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* Return the string to tell how long has passed in seconds. The passing parameter should be in
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* millisecond.
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*/
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def getUsedTimeMs(startTimeMs: Long): String = {
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return " " + (System.currentTimeMillis - startTimeMs) + " ms "
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}
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/**
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* Wrapper over newFixedThreadPool.
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*/
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def newDaemonFixedThreadPool(nThreads: Int): ThreadPoolExecutor = {
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var threadPool = Executors.newFixedThreadPool(nThreads).asInstanceOf[ThreadPoolExecutor]
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threadPool.setThreadFactory(newDaemonThreadFactory)
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return threadPool
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}
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/**
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* Delete a file or directory and its contents recursively.
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*/
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def deleteRecursively(file: File) {
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if (file.isDirectory) {
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for (child <- file.listFiles()) {
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deleteRecursively(child)
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}
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}
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if (!file.delete()) {
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throw new IOException("Failed to delete: " + file)
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}
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}
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/**
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* Convert a Java memory parameter passed to -Xmx (such as 300m or 1g) to a number of megabytes.
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* This is used to figure out how much memory to claim from Mesos based on the SPARK_MEM
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* environment variable.
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*/
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def memoryStringToMb(str: String): Int = {
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val lower = str.toLowerCase
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if (lower.endsWith("k")) {
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(lower.substring(0, lower.length-1).toLong / 1024).toInt
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} else if (lower.endsWith("m")) {
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lower.substring(0, lower.length-1).toInt
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} else if (lower.endsWith("g")) {
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lower.substring(0, lower.length-1).toInt * 1024
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} else if (lower.endsWith("t")) {
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lower.substring(0, lower.length-1).toInt * 1024 * 1024
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} else {// no suffix, so it's just a number in bytes
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(lower.toLong / 1024 / 1024).toInt
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}
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}
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/**
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* Convert a memory quantity in bytes to a human-readable string such as "4.0 MB".
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*/
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def memoryBytesToString(size: Long): String = {
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val TB = 1L << 40
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val GB = 1L << 30
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val MB = 1L << 20
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val KB = 1L << 10
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val (value, unit) = {
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if (size >= 2*TB) {
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(size.asInstanceOf[Double] / TB, "TB")
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} else if (size >= 2*GB) {
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(size.asInstanceOf[Double] / GB, "GB")
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} else if (size >= 2*MB) {
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(size.asInstanceOf[Double] / MB, "MB")
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} else if (size >= 2*KB) {
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(size.asInstanceOf[Double] / KB, "KB")
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} else {
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(size.asInstanceOf[Double], "B")
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}
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}
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"%.1f %s".formatLocal(Locale.US, value, unit)
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}
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/**
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* Convert a memory quantity in megabytes to a human-readable string such as "4.0 MB".
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*/
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def memoryMegabytesToString(megabytes: Long): String = {
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memoryBytesToString(megabytes * 1024L * 1024L)
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}
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/**
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* Execute a command in the given working directory, throwing an exception if it completes
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* with an exit code other than 0.
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*/
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def execute(command: Seq[String], workingDir: File) {
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val process = new ProcessBuilder(command: _*)
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.directory(workingDir)
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.redirectErrorStream(true)
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.start()
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new Thread("read stdout for " + command(0)) {
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override def run() {
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for (line <- Source.fromInputStream(process.getInputStream).getLines) {
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System.err.println(line)
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}
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}
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}.start()
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val exitCode = process.waitFor()
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if (exitCode != 0) {
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throw new SparkException("Process " + command + " exited with code " + exitCode)
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}
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}
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/**
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* Execute a command in the current working directory, throwing an exception if it completes
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* with an exit code other than 0.
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*/
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def execute(command: Seq[String]) {
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execute(command, new File("."))
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}
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}
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