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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.storage
import java.io.File
import java.text.SimpleDateFormat
import java.util.{Date, Random}
import org.apache.spark.Logging
import org.apache.spark.executor.ExecutorExitCode
import org.apache.spark.network.netty.{PathResolver, ShuffleSender}
import org.apache.spark.util.Utils
/**
* Creates and maintains the logical mapping between logical blocks and physical on-disk
* locations. By default, one block is mapped to one file with a name given by its BlockId.
* However, it is also possible to have a block map to only a segment of a file, by calling
* mapBlockToFileSegment().
*
* @param rootDirs The directories to use for storing block files. Data will be hashed among these.
*/
private[spark] class DiskBlockManager(shuffleManager: ShuffleBlockManager, rootDirs: String)
extends PathResolver with Logging {
private val MAX_DIR_CREATION_ATTEMPTS: Int = 10
private val subDirsPerLocalDir = shuffleManager.conf.get("spark.diskStore.subDirectories", "64").toInt
// Create one local directory for each path mentioned in spark.local.dir; then, inside this
// directory, create multiple subdirectories that we will hash files into, in order to avoid
// having really large inodes at the top level.
private val localDirs: Array[File] = createLocalDirs()
private val subDirs = Array.fill(localDirs.length)(new Array[File](subDirsPerLocalDir))
private var shuffleSender : ShuffleSender = null
addShutdownHook()
/**
* Returns the phyiscal file segment in which the given BlockId is located.
* If the BlockId has been mapped to a specific FileSegment, that will be returned.
* Otherwise, we assume the Block is mapped to a whole file identified by the BlockId directly.
*/
def getBlockLocation(blockId: BlockId): FileSegment = {
if (blockId.isShuffle && shuffleManager.consolidateShuffleFiles) {
shuffleManager.getBlockLocation(blockId.asInstanceOf[ShuffleBlockId])
} else {
val file = getFile(blockId.name)
new FileSegment(file, 0, file.length())
}
}
def getFile(filename: String): File = {
// Figure out which local directory it hashes to, and which subdirectory in that
val hash = Utils.nonNegativeHash(filename)
val dirId = hash % localDirs.length
val subDirId = (hash / localDirs.length) % subDirsPerLocalDir
// Create the subdirectory if it doesn't already exist
var subDir = subDirs(dirId)(subDirId)
if (subDir == null) {
subDir = subDirs(dirId).synchronized {
val old = subDirs(dirId)(subDirId)
if (old != null) {
old
} else {
val newDir = new File(localDirs(dirId), "%02x".format(subDirId))
newDir.mkdir()
subDirs(dirId)(subDirId) = newDir
newDir
}
}
}
new File(subDir, filename)
}
def getFile(blockId: BlockId): File = getFile(blockId.name)
private def createLocalDirs(): Array[File] = {
logDebug("Creating local directories at root dirs '" + rootDirs + "'")
val dateFormat = new SimpleDateFormat("yyyyMMddHHmmss")
rootDirs.split(",").map { rootDir =>
var foundLocalDir = false
var localDir: File = null
var localDirId: String = null
var tries = 0
val rand = new Random()
while (!foundLocalDir && tries < MAX_DIR_CREATION_ATTEMPTS) {
tries += 1
try {
localDirId = "%s-%04x".format(dateFormat.format(new Date), rand.nextInt(65536))
localDir = new File(rootDir, "spark-local-" + localDirId)
if (!localDir.exists) {
foundLocalDir = localDir.mkdirs()
}
} catch {
case e: Exception =>
logWarning("Attempt " + tries + " to create local dir " + localDir + " failed", e)
}
}
if (!foundLocalDir) {
logError("Failed " + MAX_DIR_CREATION_ATTEMPTS +
" attempts to create local dir in " + rootDir)
System.exit(ExecutorExitCode.DISK_STORE_FAILED_TO_CREATE_DIR)
}
logInfo("Created local directory at " + localDir)
localDir
}
}
private def addShutdownHook() {
localDirs.foreach(localDir => Utils.registerShutdownDeleteDir(localDir))
Runtime.getRuntime.addShutdownHook(new Thread("delete Spark local dirs") {
override def run() {
logDebug("Shutdown hook called")
localDirs.foreach { localDir =>
try {
if (!Utils.hasRootAsShutdownDeleteDir(localDir)) Utils.deleteRecursively(localDir)
} catch {
case t: Throwable =>
logError("Exception while deleting local spark dir: " + localDir, t)
}
}
if (shuffleSender != null) {
shuffleSender.stop()
}
}
})
}
private[storage] def startShuffleBlockSender(port: Int): Int = {
shuffleSender = new ShuffleSender(port, this)
logInfo("Created ShuffleSender binding to port : " + shuffleSender.port)
shuffleSender.port
}
}
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