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package spark.storage
import java.util.{HashMap => JHashMap}
import scala.collection.mutable.{ArrayBuffer, HashMap, HashSet}
import scala.collection.JavaConversions._
import scala.util.Random
import akka.actor.{Actor, ActorRef, Cancellable}
import akka.util.{Duration, Timeout}
import akka.util.duration._
import spark.{Logging, Utils}
/**
* BlockManagerMasterActor is an actor on the master node to track statuses of
* all slaves' block managers.
*/
private[spark]
class BlockManagerMasterActor(val isLocal: Boolean) extends Actor with Logging {
// Mapping from block manager id to the block manager's information.
private val blockManagerInfo =
new HashMap[BlockManagerId, BlockManagerMasterActor.BlockManagerInfo]
// Mapping from host name to block manager id. We allow multiple block managers
// on the same host name (ip).
private val blockManagerIdByHost = new HashMap[String, ArrayBuffer[BlockManagerId]]
// Mapping from block id to the set of block managers that have the block.
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 receive = {
case RegisterBlockManager(blockManagerId, maxMemSize, slaveActor) =>
register(blockManagerId, maxMemSize, slaveActor)
case UpdateBlockInfo(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 RemoveBlock(blockId) =>
removeBlock(blockId)
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)
}
def removeBlockManager(blockManagerId: BlockManagerId) {
val info = blockManagerInfo(blockManagerId)
// Remove the block manager from blockManagerIdByHost. If the list of block
// managers belonging to the IP is empty, remove the entry from the hash map.
blockManagerIdByHost.get(blockManagerId.ip).foreach { managers: ArrayBuffer[BlockManagerId] =>
managers -= blockManagerId
if (managers.size == 0) blockManagerIdByHost.remove(blockManagerId.ip)
}
// Remove it from blockManagerInfo and remove all the blocks.
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) {
logWarning("Removing BlockManager " + info.blockManagerId + " with no recent heart beats")
toRemove += info.blockManagerId
}
}
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(_.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
}
}
// Remove a block from the slaves that have it. This can only be used to remove
// blocks that the master knows about.
private def removeBlock(blockId: String) {
val block = blockInfo.get(blockId)
if (block != null) {
block._2.foreach { blockManagerId: BlockManagerId =>
val blockManager = blockManagerInfo.get(blockManagerId)
if (blockManager.isDefined) {
// Remove the block from the slave's BlockManager.
// Doesn't actually wait for a confirmation and the message might get lost.
// If message loss becomes frequent, we should add retry logic here.
blockManager.get.slaveActor ! RemoveBlock(blockId)
// Remove the block from the master's BlockManagerInfo.
blockManager.get.updateBlockInfo(blockId, StorageLevel.NONE, 0, 0)
}
}
blockInfo.remove(blockId)
}
sender ! true
}
// 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, slaveActor: ActorRef) {
val startTimeMs = System.currentTimeMillis()
val tmp = " " + blockManagerId + " "
logDebug("Got in register 0" + tmp + Utils.getUsedTimeMs(startTimeMs))
if (blockManagerId.ip == Utils.localHostName() && !isLocal) {
logInfo("Got Register Msg from master node, don't register it")
} else {
blockManagerIdByHost.get(blockManagerId.ip) match {
case Some(managers) =>
// A block manager of the same host name already exists.
logInfo("Got another registration for host " + blockManagerId)
managers += blockManagerId
case None =>
blockManagerIdByHost += (blockManagerId.ip -> ArrayBuffer(blockManagerId))
}
blockManagerInfo += (blockManagerId -> new BlockManagerMasterActor.BlockManagerInfo(
blockManagerId, System.currentTimeMillis(), maxMemSize, slaveActor))
}
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 selfIndex = peers.indexOf(blockManagerId)
if (selfIndex == -1) {
throw new Exception("Self index for " + blockManagerId + " not found")
}
// Note that this logic will select the same node multiple times if there aren't enough peers
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]
object BlockManagerMasterActor {
case class BlockStatus(storageLevel: StorageLevel, memSize: Long, diskSize: Long)
class BlockManagerInfo(
val blockManagerId: BlockManagerId,
timeMs: Long,
val maxMem: Long,
val slaveActor: ActorRef)
extends Logging {
private var _lastSeenMs: Long = timeMs
private var _remainingMem: Long = maxMem
// Mapping from block id to its status.
private val _blocks = new JHashMap[String, BlockStatus]
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).storageLevel
if (originalLevel.useMemory) {
_remainingMem += memSize
}
}
if (storageLevel.isValid) {
// isValid means it is either stored in-memory or on-disk.
_blocks.put(blockId, BlockStatus(storageLevel, memSize, diskSize))
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 blockStatus: BlockStatus = _blocks.get(blockId)
_blocks.remove(blockId)
if (blockStatus.storageLevel.useMemory) {
_remainingMem += blockStatus.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 (blockStatus.storageLevel.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, BlockStatus] = _blocks
override def toString: String = "BlockManagerInfo " + timeMs + " " + _remainingMem
def clear() {
_blocks.clear()
}
}
}
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