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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.nio.ByteBuffer
import scala.util.control.NonFatal
import org.apache.spark.Logging
import org.apache.spark.util.Utils
/**
* Stores BlockManager blocks on ExternalBlockStore.
* We capture any potential exception from underlying implementation
* and return with the expected failure value
*/
private[spark] class ExternalBlockStore(blockManager: BlockManager, executorId: String)
extends BlockStore(blockManager: BlockManager) with Logging {
lazy val externalBlockManager: Option[ExternalBlockManager] = createBlkManager()
logInfo("ExternalBlockStore started")
override def getSize(blockId: BlockId): Long = {
try {
externalBlockManager.map(_.getSize(blockId)).getOrElse(0)
} catch {
case NonFatal(t) =>
logError(s"Error in getSize($blockId)", t)
0L
}
}
override def putBytes(blockId: BlockId, bytes: ByteBuffer, level: StorageLevel): PutResult = {
putIntoExternalBlockStore(blockId, bytes, returnValues = true)
}
override def putArray(
blockId: BlockId,
values: Array[Any],
level: StorageLevel,
returnValues: Boolean): PutResult = {
putIntoExternalBlockStore(blockId, values.toIterator, returnValues)
}
override def putIterator(
blockId: BlockId,
values: Iterator[Any],
level: StorageLevel,
returnValues: Boolean): PutResult = {
putIntoExternalBlockStore(blockId, values, returnValues)
}
private def putIntoExternalBlockStore(
blockId: BlockId,
values: Iterator[_],
returnValues: Boolean): PutResult = {
logTrace(s"Attempting to put block $blockId into ExternalBlockStore")
// we should never hit here if externalBlockManager is None. Handle it anyway for safety.
try {
val startTime = System.currentTimeMillis
if (externalBlockManager.isDefined) {
externalBlockManager.get.putValues(blockId, values)
val size = getSize(blockId)
val data = if (returnValues) {
Left(getValues(blockId).get)
} else {
null
}
val finishTime = System.currentTimeMillis
logDebug("Block %s stored as %s file in ExternalBlockStore in %d ms".format(
blockId, Utils.bytesToString(size), finishTime - startTime))
PutResult(size, data)
} else {
logError(s"Error in putValues($blockId): no ExternalBlockManager has been configured")
PutResult(-1, null, Seq((blockId, BlockStatus.empty)))
}
} catch {
case NonFatal(t) =>
logError(s"Error in putValues($blockId)", t)
PutResult(-1, null, Seq((blockId, BlockStatus.empty)))
}
}
private def putIntoExternalBlockStore(
blockId: BlockId,
bytes: ByteBuffer,
returnValues: Boolean): PutResult = {
logTrace(s"Attempting to put block $blockId into ExternalBlockStore")
// we should never hit here if externalBlockManager is None. Handle it anyway for safety.
try {
val startTime = System.currentTimeMillis
if (externalBlockManager.isDefined) {
val byteBuffer = bytes.duplicate()
byteBuffer.rewind()
externalBlockManager.get.putBytes(blockId, byteBuffer)
val size = bytes.limit()
val data = if (returnValues) {
Right(bytes)
} else {
null
}
val finishTime = System.currentTimeMillis
logDebug("Block %s stored as %s file in ExternalBlockStore in %d ms".format(
blockId, Utils.bytesToString(size), finishTime - startTime))
PutResult(size, data)
} else {
logError(s"Error in putBytes($blockId): no ExternalBlockManager has been configured")
PutResult(-1, null, Seq((blockId, BlockStatus.empty)))
}
} catch {
case NonFatal(t) =>
logError(s"Error in putBytes($blockId)", t)
PutResult(-1, null, Seq((blockId, BlockStatus.empty)))
}
}
// We assume the block is removed even if exception thrown
override def remove(blockId: BlockId): Boolean = {
try {
externalBlockManager.map(_.removeBlock(blockId)).getOrElse(true)
} catch {
case NonFatal(t) =>
logError(s"Error in removeBlock($blockId)", t)
true
}
}
override def getValues(blockId: BlockId): Option[Iterator[Any]] = {
try {
externalBlockManager.flatMap(_.getValues(blockId))
} catch {
case NonFatal(t) =>
logError(s"Error in getValues($blockId)", t)
None
}
}
override def getBytes(blockId: BlockId): Option[ByteBuffer] = {
try {
externalBlockManager.flatMap(_.getBytes(blockId))
} catch {
case NonFatal(t) =>
logError(s"Error in getBytes($blockId)", t)
None
}
}
override def contains(blockId: BlockId): Boolean = {
try {
val ret = externalBlockManager.map(_.blockExists(blockId)).getOrElse(false)
if (!ret) {
logInfo(s"Remove block $blockId")
blockManager.removeBlock(blockId, true)
}
ret
} catch {
case NonFatal(t) =>
logError(s"Error in getBytes($blockId)", t)
false
}
}
private def addShutdownHook() {
Runtime.getRuntime.addShutdownHook(new Thread("ExternalBlockStore shutdown hook") {
override def run(): Unit = Utils.logUncaughtExceptions {
logDebug("Shutdown hook called")
externalBlockManager.map(_.shutdown())
}
})
}
// Create concrete block manager and fall back to Tachyon by default for backward compatibility.
private def createBlkManager(): Option[ExternalBlockManager] = {
val clsName = blockManager.conf.getOption(ExternalBlockStore.BLOCK_MANAGER_NAME)
.getOrElse(ExternalBlockStore.DEFAULT_BLOCK_MANAGER_NAME)
try {
val instance = Utils.classForName(clsName)
.newInstance()
.asInstanceOf[ExternalBlockManager]
instance.init(blockManager, executorId)
addShutdownHook();
Some(instance)
} catch {
case NonFatal(t) =>
logError("Cannot initialize external block store", t)
None
}
}
}
private[spark] object ExternalBlockStore extends Logging {
val MAX_DIR_CREATION_ATTEMPTS = 10
val SUB_DIRS_PER_DIR = "64"
val BASE_DIR = "spark.externalBlockStore.baseDir"
val FOLD_NAME = "spark.externalBlockStore.folderName"
val MASTER_URL = "spark.externalBlockStore.url"
val BLOCK_MANAGER_NAME = "spark.externalBlockStore.blockManager"
val DEFAULT_BLOCK_MANAGER_NAME = "org.apache.spark.storage.TachyonBlockManager"
}
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