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package spark.broadcast
import java.io._
import java.net._
import java.util.{Comparator, Random, UUID}
import scala.collection.mutable.{ListBuffer, Map, Set}
import scala.math
import spark._
import spark.storage.StorageLevel
private[spark] class TreeBroadcast[T](@transient var value_ : T, isLocal: Boolean, id: Long)
extends Broadcast[T](id) with Logging with Serializable {
def value = value_
def blockId = "broadcast_" + id
MultiTracker.synchronized {
SparkEnv.get.blockManager.putSingle(blockId, value_, StorageLevel.MEMORY_AND_DISK, false)
}
@transient var arrayOfBlocks: Array[BroadcastBlock] = null
@transient var totalBytes = -1
@transient var totalBlocks = -1
@transient var hasBlocks = 0
@transient var listenPortLock = new Object
@transient var guidePortLock = new Object
@transient var totalBlocksLock = new Object
@transient var hasBlocksLock = new Object
@transient var listOfSources = ListBuffer[SourceInfo]()
@transient var serveMR: ServeMultipleRequests = null
@transient var guideMR: GuideMultipleRequests = null
@transient var hostAddress = Utils.localIpAddress
@transient var listenPort = -1
@transient var guidePort = -1
@transient var stopBroadcast = false
// Must call this after all the variables have been created/initialized
if (!isLocal) {
sendBroadcast()
}
def sendBroadcast() {
logInfo("Local host address: " + hostAddress)
// Create a variableInfo object and store it in valueInfos
var variableInfo = MultiTracker.blockifyObject(value_)
// Prepare the value being broadcasted
arrayOfBlocks = variableInfo.arrayOfBlocks
totalBytes = variableInfo.totalBytes
totalBlocks = variableInfo.totalBlocks
hasBlocks = variableInfo.totalBlocks
guideMR = new GuideMultipleRequests
guideMR.setDaemon(true)
guideMR.start()
logInfo("GuideMultipleRequests started...")
// Must always come AFTER guideMR is created
while (guidePort == -1) {
guidePortLock.synchronized { guidePortLock.wait() }
}
serveMR = new ServeMultipleRequests
serveMR.setDaemon(true)
serveMR.start()
logInfo("ServeMultipleRequests started...")
// Must always come AFTER serveMR is created
while (listenPort == -1) {
listenPortLock.synchronized { listenPortLock.wait() }
}
// Must always come AFTER listenPort is created
val masterSource =
SourceInfo(hostAddress, listenPort, totalBlocks, totalBytes)
listOfSources += masterSource
// Register with the Tracker
MultiTracker.registerBroadcast(id,
SourceInfo(hostAddress, guidePort, totalBlocks, totalBytes))
}
private def readObject(in: ObjectInputStream) {
in.defaultReadObject()
MultiTracker.synchronized {
SparkEnv.get.blockManager.getSingle(blockId) match {
case Some(x) =>
value_ = x.asInstanceOf[T]
case None =>
logInfo("Started reading broadcast variable " + id)
// Initializing everything because Master will only send null/0 values
// Only the 1st worker in a node can be here. Others will get from cache
initializeWorkerVariables()
logInfo("Local host address: " + hostAddress)
serveMR = new ServeMultipleRequests
serveMR.setDaemon(true)
serveMR.start()
logInfo("ServeMultipleRequests started...")
val start = System.nanoTime
val receptionSucceeded = receiveBroadcast(id)
if (receptionSucceeded) {
value_ = MultiTracker.unBlockifyObject[T](arrayOfBlocks, totalBytes, totalBlocks)
SparkEnv.get.blockManager.putSingle(
blockId, value_, StorageLevel.MEMORY_AND_DISK, false)
} else {
logError("Reading broadcast variable " + id + " failed")
}
val time = (System.nanoTime - start) / 1e9
logInfo("Reading broadcast variable " + id + " took " + time + " s")
}
}
}
private def initializeWorkerVariables() {
arrayOfBlocks = null
totalBytes = -1
totalBlocks = -1
hasBlocks = 0
listenPortLock = new Object
totalBlocksLock = new Object
hasBlocksLock = new Object
serveMR = null
hostAddress = Utils.localIpAddress
listenPort = -1
stopBroadcast = false
}
def receiveBroadcast(variableID: Long): Boolean = {
val gInfo = MultiTracker.getGuideInfo(variableID)
if (gInfo.listenPort == SourceInfo.TxOverGoToDefault) {
return false
}
// Wait until hostAddress and listenPort are created by the
// ServeMultipleRequests thread
while (listenPort == -1) {
listenPortLock.synchronized { listenPortLock.wait() }
}
var clientSocketToMaster: Socket = null
var oosMaster: ObjectOutputStream = null
var oisMaster: ObjectInputStream = null
// Connect and receive broadcast from the specified source, retrying the
// specified number of times in case of failures
var retriesLeft = MultiTracker.MaxRetryCount
do {
// Connect to Master and send this worker's Information
clientSocketToMaster = new Socket(MultiTracker.MasterHostAddress, gInfo.listenPort)
oosMaster = new ObjectOutputStream(clientSocketToMaster.getOutputStream)
oosMaster.flush()
oisMaster = new ObjectInputStream(clientSocketToMaster.getInputStream)
logDebug("Connected to Master's guiding object")
// Send local source information
oosMaster.writeObject(SourceInfo(hostAddress, listenPort))
oosMaster.flush()
// Receive source information from Master
var sourceInfo = oisMaster.readObject.asInstanceOf[SourceInfo]
totalBlocks = sourceInfo.totalBlocks
arrayOfBlocks = new Array[BroadcastBlock](totalBlocks)
totalBlocksLock.synchronized { totalBlocksLock.notifyAll() }
totalBytes = sourceInfo.totalBytes
logDebug("Received SourceInfo from Master:" + sourceInfo + " My Port: " + listenPort)
val start = System.nanoTime
val receptionSucceeded = receiveSingleTransmission(sourceInfo)
val time = (System.nanoTime - start) / 1e9
// Updating some statistics in sourceInfo. Master will be using them later
if (!receptionSucceeded) {
sourceInfo.receptionFailed = true
}
// Send back statistics to the Master
oosMaster.writeObject(sourceInfo)
if (oisMaster != null) {
oisMaster.close()
}
if (oosMaster != null) {
oosMaster.close()
}
if (clientSocketToMaster != null) {
clientSocketToMaster.close()
}
retriesLeft -= 1
} while (retriesLeft > 0 && hasBlocks < totalBlocks)
return (hasBlocks == totalBlocks)
}
/**
* Tries to receive broadcast from the source and returns Boolean status.
* This might be called multiple times to retry a defined number of times.
*/
private def receiveSingleTransmission(sourceInfo: SourceInfo): Boolean = {
var clientSocketToSource: Socket = null
var oosSource: ObjectOutputStream = null
var oisSource: ObjectInputStream = null
var receptionSucceeded = false
try {
// Connect to the source to get the object itself
clientSocketToSource = new Socket(sourceInfo.hostAddress, sourceInfo.listenPort)
oosSource = new ObjectOutputStream(clientSocketToSource.getOutputStream)
oosSource.flush()
oisSource = new ObjectInputStream(clientSocketToSource.getInputStream)
logDebug("Inside receiveSingleTransmission")
logDebug("totalBlocks: "+ totalBlocks + " " + "hasBlocks: " + hasBlocks)
// Send the range
oosSource.writeObject((hasBlocks, totalBlocks))
oosSource.flush()
for (i <- hasBlocks until totalBlocks) {
val recvStartTime = System.currentTimeMillis
val bcBlock = oisSource.readObject.asInstanceOf[BroadcastBlock]
val receptionTime = (System.currentTimeMillis - recvStartTime)
logDebug("Received block: " + bcBlock.blockID + " from " + sourceInfo + " in " + receptionTime + " millis.")
arrayOfBlocks(hasBlocks) = bcBlock
hasBlocks += 1
// Set to true if at least one block is received
receptionSucceeded = true
hasBlocksLock.synchronized { hasBlocksLock.notifyAll() }
}
} catch {
case e: Exception => logError("receiveSingleTransmission had a " + e)
} finally {
if (oisSource != null) {
oisSource.close()
}
if (oosSource != null) {
oosSource.close()
}
if (clientSocketToSource != null) {
clientSocketToSource.close()
}
}
return receptionSucceeded
}
class GuideMultipleRequests
extends Thread with Logging {
// Keep track of sources that have completed reception
private var setOfCompletedSources = Set[SourceInfo]()
override def run() {
var threadPool = Utils.newDaemonCachedThreadPool()
var serverSocket: ServerSocket = null
serverSocket = new ServerSocket(0)
guidePort = serverSocket.getLocalPort
logInfo("GuideMultipleRequests => " + serverSocket + " " + guidePort)
guidePortLock.synchronized { guidePortLock.notifyAll() }
try {
while (!stopBroadcast) {
var clientSocket: Socket = null
try {
serverSocket.setSoTimeout(MultiTracker.ServerSocketTimeout)
clientSocket = serverSocket.accept
} catch {
case e: Exception => {
// Stop broadcast if at least one worker has connected and
// everyone connected so far are done. Comparing with
// listOfSources.size - 1, because it includes the Guide itself
listOfSources.synchronized {
setOfCompletedSources.synchronized {
if (listOfSources.size > 1 &&
setOfCompletedSources.size == listOfSources.size - 1) {
stopBroadcast = true
logInfo("GuideMultipleRequests Timeout. stopBroadcast == true.")
}
}
}
}
}
if (clientSocket != null) {
logDebug("Guide: Accepted new client connection: " + clientSocket)
try {
threadPool.execute(new GuideSingleRequest(clientSocket))
} catch {
// In failure, close() the socket here; else, the thread will close() it
case ioe: IOException => clientSocket.close()
}
}
}
logInfo("Sending stopBroadcast notifications...")
sendStopBroadcastNotifications
MultiTracker.unregisterBroadcast(id)
} finally {
if (serverSocket != null) {
logInfo("GuideMultipleRequests now stopping...")
serverSocket.close()
}
}
// Shutdown the thread pool
threadPool.shutdown()
}
private def sendStopBroadcastNotifications() {
listOfSources.synchronized {
var listIter = listOfSources.iterator
while (listIter.hasNext) {
var sourceInfo = listIter.next
var guideSocketToSource: Socket = null
var gosSource: ObjectOutputStream = null
var gisSource: ObjectInputStream = null
try {
// Connect to the source
guideSocketToSource = new Socket(sourceInfo.hostAddress, sourceInfo.listenPort)
gosSource = new ObjectOutputStream(guideSocketToSource.getOutputStream)
gosSource.flush()
gisSource = new ObjectInputStream(guideSocketToSource.getInputStream)
// Send stopBroadcast signal
gosSource.writeObject((SourceInfo.StopBroadcast, SourceInfo.StopBroadcast))
gosSource.flush()
} catch {
case e: Exception => {
logError("sendStopBroadcastNotifications had a " + e)
}
} finally {
if (gisSource != null) {
gisSource.close()
}
if (gosSource != null) {
gosSource.close()
}
if (guideSocketToSource != null) {
guideSocketToSource.close()
}
}
}
}
}
class GuideSingleRequest(val clientSocket: Socket)
extends Thread with Logging {
private val oos = new ObjectOutputStream(clientSocket.getOutputStream)
oos.flush()
private val ois = new ObjectInputStream(clientSocket.getInputStream)
private var selectedSourceInfo: SourceInfo = null
private var thisWorkerInfo:SourceInfo = null
override def run() {
try {
logInfo("new GuideSingleRequest is running")
// Connecting worker is sending in its hostAddress and listenPort it will
// be listening to. Other fields are invalid (SourceInfo.UnusedParam)
var sourceInfo = ois.readObject.asInstanceOf[SourceInfo]
listOfSources.synchronized {
// Select a suitable source and send it back to the worker
selectedSourceInfo = selectSuitableSource(sourceInfo)
logDebug("Sending selectedSourceInfo: " + selectedSourceInfo)
oos.writeObject(selectedSourceInfo)
oos.flush()
// Add this new (if it can finish) source to the list of sources
thisWorkerInfo = SourceInfo(sourceInfo.hostAddress,
sourceInfo.listenPort, totalBlocks, totalBytes)
logDebug("Adding possible new source to listOfSources: " + thisWorkerInfo)
listOfSources += thisWorkerInfo
}
// Wait till the whole transfer is done. Then receive and update source
// statistics in listOfSources
sourceInfo = ois.readObject.asInstanceOf[SourceInfo]
listOfSources.synchronized {
// This should work since SourceInfo is a case class
assert(listOfSources.contains(selectedSourceInfo))
// Remove first
// (Currently removing a source based on just one failure notification!)
listOfSources = listOfSources - selectedSourceInfo
// Update sourceInfo and put it back in, IF reception succeeded
if (!sourceInfo.receptionFailed) {
// Add thisWorkerInfo to sources that have completed reception
setOfCompletedSources.synchronized {
setOfCompletedSources += thisWorkerInfo
}
// Update leecher count and put it back in
selectedSourceInfo.currentLeechers -= 1
listOfSources += selectedSourceInfo
}
}
} catch {
case e: Exception => {
// Remove failed worker from listOfSources and update leecherCount of
// corresponding source worker
listOfSources.synchronized {
if (selectedSourceInfo != null) {
// Remove first
listOfSources = listOfSources - selectedSourceInfo
// Update leecher count and put it back in
selectedSourceInfo.currentLeechers -= 1
listOfSources += selectedSourceInfo
}
// Remove thisWorkerInfo
if (listOfSources != null) {
listOfSources = listOfSources - thisWorkerInfo
}
}
}
} finally {
logInfo("GuideSingleRequest is closing streams and sockets")
ois.close()
oos.close()
clientSocket.close()
}
}
// Assuming the caller to have a synchronized block on listOfSources
// Select one with the most leechers. This will level-wise fill the tree
private def selectSuitableSource(skipSourceInfo: SourceInfo): SourceInfo = {
var maxLeechers = -1
var selectedSource: SourceInfo = null
listOfSources.foreach { source =>
if ((source.hostAddress != skipSourceInfo.hostAddress ||
source.listenPort != skipSourceInfo.listenPort) &&
source.currentLeechers < MultiTracker.MaxDegree &&
source.currentLeechers > maxLeechers) {
selectedSource = source
maxLeechers = source.currentLeechers
}
}
// Update leecher count
selectedSource.currentLeechers += 1
return selectedSource
}
}
}
class ServeMultipleRequests
extends Thread with Logging {
var threadPool = Utils.newDaemonCachedThreadPool()
override def run() {
var serverSocket = new ServerSocket(0)
listenPort = serverSocket.getLocalPort
logInfo("ServeMultipleRequests started with " + serverSocket)
listenPortLock.synchronized { listenPortLock.notifyAll() }
try {
while (!stopBroadcast) {
var clientSocket: Socket = null
try {
serverSocket.setSoTimeout(MultiTracker.ServerSocketTimeout)
clientSocket = serverSocket.accept
} catch {
case e: Exception => { }
}
if (clientSocket != null) {
logDebug("Serve: Accepted new client connection: " + clientSocket)
try {
threadPool.execute(new ServeSingleRequest(clientSocket))
} catch {
// In failure, close socket here; else, the thread will close it
case ioe: IOException => clientSocket.close()
}
}
}
} finally {
if (serverSocket != null) {
logInfo("ServeMultipleRequests now stopping...")
serverSocket.close()
}
}
// Shutdown the thread pool
threadPool.shutdown()
}
class ServeSingleRequest(val clientSocket: Socket)
extends Thread with Logging {
private val oos = new ObjectOutputStream(clientSocket.getOutputStream)
oos.flush()
private val ois = new ObjectInputStream(clientSocket.getInputStream)
private var sendFrom = 0
private var sendUntil = totalBlocks
override def run() {
try {
logInfo("new ServeSingleRequest is running")
// Receive range to send
var rangeToSend = ois.readObject.asInstanceOf[(Int, Int)]
sendFrom = rangeToSend._1
sendUntil = rangeToSend._2
// If not a valid range, stop broadcast
if (sendFrom == SourceInfo.StopBroadcast && sendUntil == SourceInfo.StopBroadcast) {
stopBroadcast = true
} else {
sendObject
}
} catch {
case e: Exception => logError("ServeSingleRequest had a " + e)
} finally {
logInfo("ServeSingleRequest is closing streams and sockets")
ois.close()
oos.close()
clientSocket.close()
}
}
private def sendObject() {
// Wait till receiving the SourceInfo from Master
while (totalBlocks == -1) {
totalBlocksLock.synchronized { totalBlocksLock.wait() }
}
for (i <- sendFrom until sendUntil) {
while (i == hasBlocks) {
hasBlocksLock.synchronized { hasBlocksLock.wait() }
}
try {
oos.writeObject(arrayOfBlocks(i))
oos.flush()
} catch {
case e: Exception => logError("sendObject had a " + e)
}
logDebug("Sent block: " + i + " to " + clientSocket)
}
}
}
}
}
private[spark] class TreeBroadcastFactory
extends BroadcastFactory {
def initialize(isMaster: Boolean) { MultiTracker.initialize(isMaster) }
def newBroadcast[T](value_ : T, isLocal: Boolean, id: Long) =
new TreeBroadcast[T](value_, isLocal, id)
def stop() { MultiTracker.stop() }
}
|