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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.IOException
import java.nio.ByteBuffer
import com.google.common.io.ByteStreams
import tachyon.client.{ReadType, WriteType}
import org.apache.spark.Logging
import org.apache.spark.util.Utils
/**
* Stores BlockManager blocks on Tachyon.
*/
private[spark] class TachyonStore(
blockManager: BlockManager,
tachyonManager: TachyonBlockManager)
extends BlockStore(blockManager: BlockManager) with Logging {
logInfo("TachyonStore started")
override def getSize(blockId: BlockId): Long = {
tachyonManager.getFile(blockId.name).length
}
override def putBytes(blockId: BlockId, bytes: ByteBuffer, level: StorageLevel): PutResult = {
putIntoTachyonStore(blockId, bytes, returnValues = true)
}
override def putArray(
blockId: BlockId,
values: Array[Any],
level: StorageLevel,
returnValues: Boolean): PutResult = {
putIterator(blockId, values.toIterator, level, returnValues)
}
override def putIterator(
blockId: BlockId,
values: Iterator[Any],
level: StorageLevel,
returnValues: Boolean): PutResult = {
logDebug(s"Attempting to write values for block $blockId")
val bytes = blockManager.dataSerialize(blockId, values)
putIntoTachyonStore(blockId, bytes, returnValues)
}
private def putIntoTachyonStore(
blockId: BlockId,
bytes: ByteBuffer,
returnValues: Boolean): PutResult = {
// So that we do not modify the input offsets !
// duplicate does not copy buffer, so inexpensive
val byteBuffer = bytes.duplicate()
byteBuffer.rewind()
logDebug(s"Attempting to put block $blockId into Tachyon")
val startTime = System.currentTimeMillis
val file = tachyonManager.getFile(blockId)
val os = file.getOutStream(WriteType.TRY_CACHE)
os.write(byteBuffer.array())
os.close()
val finishTime = System.currentTimeMillis
logDebug("Block %s stored as %s file in Tachyon in %d ms".format(
blockId, Utils.bytesToString(byteBuffer.limit), finishTime - startTime))
if (returnValues) {
PutResult(bytes.limit(), Right(bytes.duplicate()))
} else {
PutResult(bytes.limit(), null)
}
}
override def remove(blockId: BlockId): Boolean = {
val file = tachyonManager.getFile(blockId)
if (tachyonManager.fileExists(file)) {
tachyonManager.removeFile(file)
} else {
false
}
}
override def getValues(blockId: BlockId): Option[Iterator[Any]] = {
getBytes(blockId).map(buffer => blockManager.dataDeserialize(blockId, buffer))
}
override def getBytes(blockId: BlockId): Option[ByteBuffer] = {
val file = tachyonManager.getFile(blockId)
if (file == null || file.getLocationHosts.size == 0) {
return None
}
val is = file.getInStream(ReadType.CACHE)
assert (is != null)
try {
val size = file.length
val bs = new Array[Byte](size.asInstanceOf[Int])
ByteStreams.readFully(is, bs)
Some(ByteBuffer.wrap(bs))
} catch {
case ioe: IOException =>
logWarning(s"Failed to fetch the block $blockId from Tachyon", ioe)
None
}
}
override def contains(blockId: BlockId): Boolean = {
val file = tachyonManager.getFile(blockId)
tachyonManager.fileExists(file)
}
}
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