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|
package spark.storage
import java.io._
import java.util.{HashMap => JHashMap}
import scala.collection.mutable.{ArrayBuffer, HashMap, HashSet}
import scala.util.Random
import akka.actor._
import akka.dispatch._
import akka.pattern.ask
import akka.remote._
import akka.util.{Duration, Timeout}
import akka.util.duration._
import spark.{Logging, SparkException, Utils}
private[spark]
sealed trait ToBlockManagerMaster
private[spark]
case class RegisterBlockManager(
blockManagerId: BlockManagerId,
maxMemSize: Long)
extends ToBlockManagerMaster
private[spark]
case class HeartBeat(blockManagerId: BlockManagerId) extends ToBlockManagerMaster
private[spark]
class BlockUpdate(
var blockManagerId: BlockManagerId,
var blockId: String,
var storageLevel: StorageLevel,
var memSize: Long,
var diskSize: Long)
extends ToBlockManagerMaster
with Externalizable {
def this() = this(null, null, null, 0, 0) // For deserialization only
override def writeExternal(out: ObjectOutput) {
blockManagerId.writeExternal(out)
out.writeUTF(blockId)
storageLevel.writeExternal(out)
out.writeInt(memSize.toInt)
out.writeInt(diskSize.toInt)
}
override def readExternal(in: ObjectInput) {
blockManagerId = new BlockManagerId()
blockManagerId.readExternal(in)
blockId = in.readUTF()
storageLevel = new StorageLevel()
storageLevel.readExternal(in)
memSize = in.readInt()
diskSize = in.readInt()
}
}
private[spark]
object BlockUpdate {
def apply(blockManagerId: BlockManagerId,
blockId: String,
storageLevel: StorageLevel,
memSize: Long,
diskSize: Long): BlockUpdate = {
new BlockUpdate(blockManagerId, blockId, storageLevel, memSize, diskSize)
}
// For pattern-matching
def unapply(h: BlockUpdate): Option[(BlockManagerId, String, StorageLevel, Long, Long)] = {
Some((h.blockManagerId, h.blockId, h.storageLevel, h.memSize, h.diskSize))
}
}
private[spark]
case class GetLocations(blockId: String) extends ToBlockManagerMaster
private[spark]
case class GetLocationsMultipleBlockIds(blockIds: Array[String]) extends ToBlockManagerMaster
private[spark]
case class GetPeers(blockManagerId: BlockManagerId, size: Int) extends ToBlockManagerMaster
private[spark]
case class RemoveHost(host: String) extends ToBlockManagerMaster
private[spark]
case object StopBlockManagerMaster extends ToBlockManagerMaster
private[spark]
case object GetMemoryStatus extends ToBlockManagerMaster
private[spark]
case object ExpireDeadHosts extends ToBlockManagerMaster
private[spark] class BlockManagerMasterActor(val isLocal: Boolean) extends Actor with Logging {
class BlockManagerInfo(
val blockManagerId: BlockManagerId,
timeMs: Long,
val maxMem: Long) {
private var _lastSeenMs = timeMs
private var _remainingMem = maxMem
private val _blocks = new JHashMap[String, StorageLevel]
logInfo("Registering block manager %s:%d with %s RAM".format(
blockManagerId.ip, blockManagerId.port, Utils.memoryBytesToString(maxMem)))
def updateLastSeenMs() {
_lastSeenMs = System.currentTimeMillis()
}
def updateBlockInfo(blockId: String, storageLevel: StorageLevel, memSize: Long, diskSize: Long)
: Unit = synchronized {
updateLastSeenMs()
if (_blocks.containsKey(blockId)) {
// The block exists on the slave already.
val originalLevel: StorageLevel = _blocks.get(blockId)
if (originalLevel.useMemory) {
_remainingMem += memSize
}
}
if (storageLevel.isValid) {
// isValid means it is either stored in-memory or on-disk.
_blocks.put(blockId, storageLevel)
if (storageLevel.useMemory) {
_remainingMem -= memSize
logInfo("Added %s in memory on %s:%d (size: %s, free: %s)".format(
blockId, blockManagerId.ip, blockManagerId.port, Utils.memoryBytesToString(memSize),
Utils.memoryBytesToString(_remainingMem)))
}
if (storageLevel.useDisk) {
logInfo("Added %s on disk on %s:%d (size: %s)".format(
blockId, blockManagerId.ip, blockManagerId.port, Utils.memoryBytesToString(diskSize)))
}
} else if (_blocks.containsKey(blockId)) {
// If isValid is not true, drop the block.
val originalLevel: StorageLevel = _blocks.get(blockId)
_blocks.remove(blockId)
if (originalLevel.useMemory) {
_remainingMem += memSize
logInfo("Removed %s on %s:%d in memory (size: %s, free: %s)".format(
blockId, blockManagerId.ip, blockManagerId.port, Utils.memoryBytesToString(memSize),
Utils.memoryBytesToString(_remainingMem)))
}
if (originalLevel.useDisk) {
logInfo("Removed %s on %s:%d on disk (size: %s)".format(
blockId, blockManagerId.ip, blockManagerId.port, Utils.memoryBytesToString(diskSize)))
}
}
}
def remainingMem: Long = _remainingMem
def lastSeenMs: Long = _lastSeenMs
def blocks: JHashMap[String, StorageLevel] = _blocks
override def toString: String = "BlockManagerInfo " + timeMs + " " + _remainingMem
def clear() {
_blocks.clear()
}
}
private val blockManagerInfo = new HashMap[BlockManagerId, BlockManagerInfo]
private val blockManagerIdByHost = new HashMap[String, BlockManagerId]
private val blockInfo = new JHashMap[String, Pair[Int, HashSet[BlockManagerId]]]
initLogging()
val slaveTimeout = System.getProperty("spark.storage.blockManagerSlaveTimeoutMs",
"" + (BlockManager.getHeartBeatFrequencyFromSystemProperties * 3)).toLong
val checkTimeoutInterval = System.getProperty("spark.storage.blockManagerTimeoutIntervalMs",
"5000").toLong
var timeoutCheckingTask: Cancellable = null
override def preStart() {
if (!BlockManager.getDisableHeartBeatsForTesting) {
timeoutCheckingTask = context.system.scheduler.schedule(
0.seconds, checkTimeoutInterval.milliseconds, self, ExpireDeadHosts)
}
super.preStart()
}
def removeBlockManager(blockManagerId: BlockManagerId) {
val info = blockManagerInfo(blockManagerId)
blockManagerIdByHost.remove(blockManagerId.ip)
blockManagerInfo.remove(blockManagerId)
var iterator = info.blocks.keySet.iterator
while (iterator.hasNext) {
val blockId = iterator.next
val locations = blockInfo.get(blockId)._2
locations -= blockManagerId
if (locations.size == 0) {
blockInfo.remove(locations)
}
}
}
def expireDeadHosts() {
logDebug("Checking for hosts with no recent heart beats in BlockManagerMaster.")
val now = System.currentTimeMillis()
val minSeenTime = now - slaveTimeout
val toRemove = new HashSet[BlockManagerId]
for (info <- blockManagerInfo.values) {
if (info.lastSeenMs < minSeenTime) {
logInfo("Removing BlockManager " + info.blockManagerId + " with no recent heart beats")
toRemove += info.blockManagerId
}
}
// TODO: Remove corresponding block infos
toRemove.foreach(removeBlockManager)
}
def removeHost(host: String) {
logInfo("Trying to remove the host: " + host + " from BlockManagerMaster.")
logInfo("Previous hosts: " + blockManagerInfo.keySet.toSeq)
blockManagerIdByHost.get(host).foreach(removeBlockManager)
logInfo("Current hosts: " + blockManagerInfo.keySet.toSeq)
sender ! true
}
def heartBeat(blockManagerId: BlockManagerId) {
if (!blockManagerInfo.contains(blockManagerId)) {
if (blockManagerId.ip == Utils.localHostName() && !isLocal) {
sender ! true
} else {
sender ! false
}
} else {
blockManagerInfo(blockManagerId).updateLastSeenMs()
sender ! true
}
}
def receive = {
case RegisterBlockManager(blockManagerId, maxMemSize) =>
register(blockManagerId, maxMemSize)
case BlockUpdate(blockManagerId, blockId, storageLevel, deserializedSize, size) =>
blockUpdate(blockManagerId, blockId, storageLevel, deserializedSize, size)
case GetLocations(blockId) =>
getLocations(blockId)
case GetLocationsMultipleBlockIds(blockIds) =>
getLocationsMultipleBlockIds(blockIds)
case GetPeers(blockManagerId, size) =>
getPeersDeterministic(blockManagerId, size)
/*getPeers(blockManagerId, size)*/
case GetMemoryStatus =>
getMemoryStatus
case RemoveHost(host) =>
removeHost(host)
sender ! true
case StopBlockManagerMaster =>
logInfo("Stopping BlockManagerMaster")
sender ! true
if (timeoutCheckingTask != null) {
timeoutCheckingTask.cancel
}
context.stop(self)
case ExpireDeadHosts =>
expireDeadHosts()
case HeartBeat(blockManagerId) =>
heartBeat(blockManagerId)
case other =>
logInfo("Got unknown message: " + other)
}
// Return a map from the block manager id to max memory and remaining memory.
private def getMemoryStatus() {
val res = blockManagerInfo.map { case(blockManagerId, info) =>
(blockManagerId, (info.maxMem, info.remainingMem))
}.toMap
sender ! res
}
private def register(blockManagerId: BlockManagerId, maxMemSize: Long) {
val startTimeMs = System.currentTimeMillis()
val tmp = " " + blockManagerId + " "
logDebug("Got in register 0" + tmp + Utils.getUsedTimeMs(startTimeMs))
if (blockManagerIdByHost.contains(blockManagerId.ip) &&
blockManagerIdByHost(blockManagerId.ip) != blockManagerId) {
val oldId = blockManagerIdByHost(blockManagerId.ip)
logInfo("Got second registration for host " + blockManagerId +
"; removing old slave " + oldId)
removeBlockManager(oldId)
}
if (blockManagerId.ip == Utils.localHostName() && !isLocal) {
logInfo("Got Register Msg from master node, don't register it")
} else {
blockManagerInfo += (blockManagerId -> new BlockManagerInfo(
blockManagerId, System.currentTimeMillis(), maxMemSize))
}
blockManagerIdByHost += (blockManagerId.ip -> blockManagerId)
logDebug("Got in register 1" + tmp + Utils.getUsedTimeMs(startTimeMs))
sender ! true
}
private def blockUpdate(
blockManagerId: BlockManagerId,
blockId: String,
storageLevel: StorageLevel,
memSize: Long,
diskSize: Long) {
val startTimeMs = System.currentTimeMillis()
val tmp = " " + blockManagerId + " " + blockId + " "
if (!blockManagerInfo.contains(blockManagerId)) {
if (blockManagerId.ip == Utils.localHostName() && !isLocal) {
// We intentionally do not register the master (except in local mode),
// so we should not indicate failure.
sender ! true
} else {
sender ! false
}
return
}
if (blockId == null) {
blockManagerInfo(blockManagerId).updateLastSeenMs()
logDebug("Got in block update 1" + tmp + " used " + Utils.getUsedTimeMs(startTimeMs))
sender ! true
return
}
blockManagerInfo(blockManagerId).updateBlockInfo(blockId, storageLevel, memSize, diskSize)
var locations: HashSet[BlockManagerId] = null
if (blockInfo.containsKey(blockId)) {
locations = blockInfo.get(blockId)._2
} else {
locations = new HashSet[BlockManagerId]
blockInfo.put(blockId, (storageLevel.replication, locations))
}
if (storageLevel.isValid) {
locations += blockManagerId
} else {
locations.remove(blockManagerId)
}
if (locations.size == 0) {
blockInfo.remove(blockId)
}
sender ! true
}
private def getLocations(blockId: String) {
val startTimeMs = System.currentTimeMillis()
val tmp = " " + blockId + " "
logDebug("Got in getLocations 0" + tmp + Utils.getUsedTimeMs(startTimeMs))
if (blockInfo.containsKey(blockId)) {
var res: ArrayBuffer[BlockManagerId] = new ArrayBuffer[BlockManagerId]
res.appendAll(blockInfo.get(blockId)._2)
logDebug("Got in getLocations 1" + tmp + " as "+ res.toSeq + " at "
+ Utils.getUsedTimeMs(startTimeMs))
sender ! res.toSeq
} else {
logDebug("Got in getLocations 2" + tmp + Utils.getUsedTimeMs(startTimeMs))
var res: ArrayBuffer[BlockManagerId] = new ArrayBuffer[BlockManagerId]
sender ! res
}
}
private def getLocationsMultipleBlockIds(blockIds: Array[String]) {
def getLocations(blockId: String): Seq[BlockManagerId] = {
val tmp = blockId
logDebug("Got in getLocationsMultipleBlockIds Sub 0 " + tmp)
if (blockInfo.containsKey(blockId)) {
var res: ArrayBuffer[BlockManagerId] = new ArrayBuffer[BlockManagerId]
res.appendAll(blockInfo.get(blockId)._2)
logDebug("Got in getLocationsMultipleBlockIds Sub 1 " + tmp + " " + res.toSeq)
return res.toSeq
} else {
logDebug("Got in getLocationsMultipleBlockIds Sub 2 " + tmp)
var res: ArrayBuffer[BlockManagerId] = new ArrayBuffer[BlockManagerId]
return res.toSeq
}
}
logDebug("Got in getLocationsMultipleBlockIds " + blockIds.toSeq)
var res: ArrayBuffer[Seq[BlockManagerId]] = new ArrayBuffer[Seq[BlockManagerId]]
for (blockId <- blockIds) {
res.append(getLocations(blockId))
}
logDebug("Got in getLocationsMultipleBlockIds " + blockIds.toSeq + " : " + res.toSeq)
sender ! res.toSeq
}
private def getPeers(blockManagerId: BlockManagerId, size: Int) {
var peers: Array[BlockManagerId] = blockManagerInfo.keySet.toArray
var res: ArrayBuffer[BlockManagerId] = new ArrayBuffer[BlockManagerId]
res.appendAll(peers)
res -= blockManagerId
val rand = new Random(System.currentTimeMillis())
while (res.length > size) {
res.remove(rand.nextInt(res.length))
}
sender ! res.toSeq
}
private def getPeersDeterministic(blockManagerId: BlockManagerId, size: Int) {
var peers: Array[BlockManagerId] = blockManagerInfo.keySet.toArray
var res: ArrayBuffer[BlockManagerId] = new ArrayBuffer[BlockManagerId]
val peersWithIndices = peers.zipWithIndex
val selfIndex = peersWithIndices.find(_._1 == blockManagerId).map(_._2).getOrElse(-1)
if (selfIndex == -1) {
throw new Exception("Self index for " + blockManagerId + " not found")
}
var index = selfIndex
while (res.size < size) {
index += 1
if (index == selfIndex) {
throw new Exception("More peer expected than available")
}
res += peers(index % peers.size)
}
sender ! res.toSeq
}
}
private[spark] class BlockManagerMaster(actorSystem: ActorSystem, isMaster: Boolean, isLocal: Boolean)
extends Logging {
val AKKA_ACTOR_NAME: String = "BlockMasterManager"
val REQUEST_RETRY_INTERVAL_MS = 100
val DEFAULT_MASTER_IP: String = System.getProperty("spark.master.host", "localhost")
val DEFAULT_MASTER_PORT: Int = System.getProperty("spark.master.port", "7077").toInt
val DEFAULT_MANAGER_IP: String = Utils.localHostName()
val timeout = 10.seconds
var masterActor: ActorRef = null
if (isMaster) {
masterActor = actorSystem.actorOf(
Props(new BlockManagerMasterActor(isLocal)), name = AKKA_ACTOR_NAME)
logInfo("Registered BlockManagerMaster Actor")
} else {
val url = "akka://spark@%s:%s/user/%s".format(
DEFAULT_MASTER_IP, DEFAULT_MASTER_PORT, AKKA_ACTOR_NAME)
logInfo("Connecting to BlockManagerMaster: " + url)
masterActor = actorSystem.actorFor(url)
}
def stop() {
if (masterActor != null) {
communicate(StopBlockManagerMaster)
masterActor = null
logInfo("BlockManagerMaster stopped")
}
}
// Send a message to the master actor and get its result within a default timeout, or
// throw a SparkException if this fails.
def askMaster(message: Any): Any = {
try {
val future = masterActor.ask(message)(timeout)
return Await.result(future, timeout)
} catch {
case e: Exception =>
throw new SparkException("Error communicating with BlockManagerMaster", e)
}
}
// Send a one-way message to the master actor, to which we expect it to reply with true.
def communicate(message: Any) {
if (askMaster(message) != true) {
throw new SparkException("Error reply received from BlockManagerMaster")
}
}
def notifyADeadHost(host: String) {
communicate(RemoveHost(host))
logInfo("Removed " + host + " successfully in notifyADeadHost")
}
def mustRegisterBlockManager(msg: RegisterBlockManager) {
logInfo("Trying to register BlockManager")
while (! syncRegisterBlockManager(msg)) {
logWarning("Failed to register " + msg)
Thread.sleep(REQUEST_RETRY_INTERVAL_MS)
}
logInfo("Done registering BlockManager")
}
def syncRegisterBlockManager(msg: RegisterBlockManager): Boolean = {
//val masterActor = RemoteActor.select(node, name)
val startTimeMs = System.currentTimeMillis()
val tmp = " msg " + msg + " "
logDebug("Got in syncRegisterBlockManager 0 " + tmp + Utils.getUsedTimeMs(startTimeMs))
try {
communicate(msg)
logInfo("BlockManager registered successfully @ syncRegisterBlockManager")
logDebug("Got in syncRegisterBlockManager 1 " + tmp + Utils.getUsedTimeMs(startTimeMs))
return true
} catch {
case e: Exception =>
logError("Failed in syncRegisterBlockManager", e)
return false
}
}
def mustHeartBeat(msg: HeartBeat): Boolean = {
var res = syncHeartBeat(msg)
while (!res.isDefined) {
logWarning("Failed to send heart beat " + msg)
Thread.sleep(REQUEST_RETRY_INTERVAL_MS)
}
return res.get
}
def syncHeartBeat(msg: HeartBeat): Option[Boolean] = {
try {
val answer = askMaster(msg).asInstanceOf[Boolean]
return Some(answer)
} catch {
case e: Exception =>
logError("Failed in syncHeartBeat", e)
return None
}
}
def mustBlockUpdate(msg: BlockUpdate): Boolean = {
var res = syncBlockUpdate(msg)
while (!res.isDefined) {
logWarning("Failed to send block update " + msg)
Thread.sleep(REQUEST_RETRY_INTERVAL_MS)
}
return res.get
}
def syncBlockUpdate(msg: BlockUpdate): Option[Boolean] = {
val startTimeMs = System.currentTimeMillis()
val tmp = " msg " + msg + " "
logDebug("Got in syncBlockUpdate " + tmp + " 0 " + Utils.getUsedTimeMs(startTimeMs))
try {
val answer = askMaster(msg).asInstanceOf[Boolean]
logDebug("Block update sent successfully")
logDebug("Got in synbBlockUpdate " + tmp + " 1 " + Utils.getUsedTimeMs(startTimeMs))
return Some(answer)
} catch {
case e: Exception =>
logError("Failed in syncBlockUpdate", e)
return None
}
}
def mustGetLocations(msg: GetLocations): Seq[BlockManagerId] = {
var res = syncGetLocations(msg)
while (res == null) {
logInfo("Failed to get locations " + msg)
Thread.sleep(REQUEST_RETRY_INTERVAL_MS)
res = syncGetLocations(msg)
}
return res
}
def syncGetLocations(msg: GetLocations): Seq[BlockManagerId] = {
val startTimeMs = System.currentTimeMillis()
val tmp = " msg " + msg + " "
logDebug("Got in syncGetLocations 0 " + tmp + Utils.getUsedTimeMs(startTimeMs))
try {
val answer = askMaster(msg).asInstanceOf[ArrayBuffer[BlockManagerId]]
if (answer != null) {
logDebug("GetLocations successful")
logDebug("Got in syncGetLocations 1 " + tmp + Utils.getUsedTimeMs(startTimeMs))
return answer
} else {
logError("Master replied null in response to GetLocations")
return null
}
} catch {
case e: Exception =>
logError("GetLocations failed", e)
return null
}
}
def mustGetLocationsMultipleBlockIds(msg: GetLocationsMultipleBlockIds):
Seq[Seq[BlockManagerId]] = {
var res: Seq[Seq[BlockManagerId]] = syncGetLocationsMultipleBlockIds(msg)
while (res == null) {
logWarning("Failed to GetLocationsMultipleBlockIds " + msg)
Thread.sleep(REQUEST_RETRY_INTERVAL_MS)
res = syncGetLocationsMultipleBlockIds(msg)
}
return res
}
def syncGetLocationsMultipleBlockIds(msg: GetLocationsMultipleBlockIds):
Seq[Seq[BlockManagerId]] = {
val startTimeMs = System.currentTimeMillis
val tmp = " msg " + msg + " "
logDebug("Got in syncGetLocationsMultipleBlockIds 0 " + tmp + Utils.getUsedTimeMs(startTimeMs))
try {
val answer = askMaster(msg).asInstanceOf[Seq[Seq[BlockManagerId]]]
if (answer != null) {
logDebug("GetLocationsMultipleBlockIds successful")
logDebug("Got in syncGetLocationsMultipleBlockIds 1 " + tmp +
Utils.getUsedTimeMs(startTimeMs))
return answer
} else {
logError("Master replied null in response to GetLocationsMultipleBlockIds")
return null
}
} catch {
case e: Exception =>
logError("GetLocationsMultipleBlockIds failed", e)
return null
}
}
def mustGetPeers(msg: GetPeers): Seq[BlockManagerId] = {
var res = syncGetPeers(msg)
while ((res == null) || (res.length != msg.size)) {
logInfo("Failed to get peers " + msg)
Thread.sleep(REQUEST_RETRY_INTERVAL_MS)
res = syncGetPeers(msg)
}
return res
}
def syncGetPeers(msg: GetPeers): Seq[BlockManagerId] = {
val startTimeMs = System.currentTimeMillis
val tmp = " msg " + msg + " "
logDebug("Got in syncGetPeers 0 " + tmp + Utils.getUsedTimeMs(startTimeMs))
try {
val answer = askMaster(msg).asInstanceOf[Seq[BlockManagerId]]
if (answer != null) {
logDebug("GetPeers successful")
logDebug("Got in syncGetPeers 1 " + tmp + Utils.getUsedTimeMs(startTimeMs))
return answer
} else {
logError("Master replied null in response to GetPeers")
return null
}
} catch {
case e: Exception =>
logError("GetPeers failed", e)
return null
}
}
def getMemoryStatus: Map[BlockManagerId, (Long, Long)] = {
askMaster(GetMemoryStatus).asInstanceOf[Map[BlockManagerId, (Long, Long)]]
}
}
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