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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, IOException}
import java.util.UUID
import org.apache.spark.{Logging, SparkConf}
import org.apache.spark.executor.ExecutorExitCode
import org.apache.spark.util.{ShutdownHookManager, 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().
*
* Block files are hashed among the directories listed in spark.local.dir (or in
* SPARK_LOCAL_DIRS, if it's set).
*/
private[spark] class DiskBlockManager(blockManager: BlockManager, conf: SparkConf)
extends Logging {
private[spark]
val subDirsPerLocalDir = blockManager.conf.getInt("spark.diskStore.subDirectories", 64)
/* 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[spark] val localDirs: Array[File] = createLocalDirs(conf)
if (localDirs.isEmpty) {
logError("Failed to create any local dir.")
System.exit(ExecutorExitCode.DISK_STORE_FAILED_TO_CREATE_DIR)
}
// The content of subDirs is immutable but the content of subDirs(i) is mutable. And the content
// of subDirs(i) is protected by the lock of subDirs(i)
private val subDirs = Array.fill(localDirs.length)(new Array[File](subDirsPerLocalDir))
private val shutdownHook = addShutdownHook()
/** Looks up a file by hashing it into one of our local subdirectories. */
// This method should be kept in sync with
// org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#getFile().
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
val subDir = subDirs(dirId).synchronized {
val old = subDirs(dirId)(subDirId)
if (old != null) {
old
} else {
val newDir = new File(localDirs(dirId), "%02x".format(subDirId))
if (!newDir.exists() && !newDir.mkdir()) {
throw new IOException(s"Failed to create local dir in $newDir.")
}
subDirs(dirId)(subDirId) = newDir
newDir
}
}
new File(subDir, filename)
}
def getFile(blockId: BlockId): File = getFile(blockId.name)
/** Check if disk block manager has a block. */
def containsBlock(blockId: BlockId): Boolean = {
getFile(blockId.name).exists()
}
/** List all the files currently stored on disk by the disk manager. */
def getAllFiles(): Seq[File] = {
// Get all the files inside the array of array of directories
subDirs.flatMap { dir =>
dir.synchronized {
// Copy the content of dir because it may be modified in other threads
dir.clone()
}
}.filter(_ != null).flatMap { dir =>
val files = dir.listFiles()
if (files != null) files else Seq.empty
}
}
/** List all the blocks currently stored on disk by the disk manager. */
def getAllBlocks(): Seq[BlockId] = {
getAllFiles().map(f => BlockId(f.getName))
}
/** Produces a unique block id and File suitable for storing local intermediate results. */
def createTempLocalBlock(): (TempLocalBlockId, File) = {
var blockId = new TempLocalBlockId(UUID.randomUUID())
while (getFile(blockId).exists()) {
blockId = new TempLocalBlockId(UUID.randomUUID())
}
(blockId, getFile(blockId))
}
/** Produces a unique block id and File suitable for storing shuffled intermediate results. */
def createTempShuffleBlock(): (TempShuffleBlockId, File) = {
var blockId = new TempShuffleBlockId(UUID.randomUUID())
while (getFile(blockId).exists()) {
blockId = new TempShuffleBlockId(UUID.randomUUID())
}
(blockId, getFile(blockId))
}
/**
* Create local directories for storing block data. These directories are
* located inside configured local directories and won't
* be deleted on JVM exit when using the external shuffle service.
*/
private def createLocalDirs(conf: SparkConf): Array[File] = {
Utils.getConfiguredLocalDirs(conf).flatMap { rootDir =>
try {
val localDir = Utils.createDirectory(rootDir, "blockmgr")
logInfo(s"Created local directory at $localDir")
Some(localDir)
} catch {
case e: IOException =>
logError(s"Failed to create local dir in $rootDir. Ignoring this directory.", e)
None
}
}
}
private def addShutdownHook(): AnyRef = {
ShutdownHookManager.addShutdownHook(ShutdownHookManager.TEMP_DIR_SHUTDOWN_PRIORITY + 1) { () =>
logInfo("Shutdown hook called")
DiskBlockManager.this.doStop()
}
}
/** Cleanup local dirs and stop shuffle sender. */
private[spark] def stop() {
// Remove the shutdown hook. It causes memory leaks if we leave it around.
try {
ShutdownHookManager.removeShutdownHook(shutdownHook)
} catch {
case e: Exception =>
logError(s"Exception while removing shutdown hook.", e)
}
doStop()
}
private def doStop(): Unit = {
// Only perform cleanup if an external service is not serving our shuffle files.
// Also blockManagerId could be null if block manager is not initialized properly.
if (!blockManager.externalShuffleServiceEnabled ||
(blockManager.blockManagerId != null && blockManager.blockManagerId.isDriver)) {
localDirs.foreach { localDir =>
if (localDir.isDirectory() && localDir.exists()) {
try {
if (!ShutdownHookManager.hasRootAsShutdownDeleteDir(localDir)) {
Utils.deleteRecursively(localDir)
}
} catch {
case e: Exception =>
logError(s"Exception while deleting local spark dir: $localDir", e)
}
}
}
}
}
}
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