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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, MappedByteBuffer}
import java.util.Arrays
import org.apache.spark.{SparkConf, SparkFunSuite}
import org.apache.spark.util.io.ChunkedByteBuffer
class DiskStoreSuite extends SparkFunSuite {
test("reads of memory-mapped and non memory-mapped files are equivalent") {
val confKey = "spark.storage.memoryMapThreshold"
// Create a non-trivial (not all zeros) byte array
val bytes = Array.tabulate[Byte](1000)(_.toByte)
val byteBuffer = new ChunkedByteBuffer(ByteBuffer.wrap(bytes))
val blockId = BlockId("rdd_1_2")
val diskBlockManager = new DiskBlockManager(new SparkConf(), deleteFilesOnStop = true)
val diskStoreMapped = new DiskStore(new SparkConf().set(confKey, "0"), diskBlockManager)
diskStoreMapped.putBytes(blockId, byteBuffer)
val mapped = diskStoreMapped.getBytes(blockId)
assert(diskStoreMapped.remove(blockId))
val diskStoreNotMapped = new DiskStore(new SparkConf().set(confKey, "1m"), diskBlockManager)
diskStoreNotMapped.putBytes(blockId, byteBuffer)
val notMapped = diskStoreNotMapped.getBytes(blockId)
// Not possible to do isInstanceOf due to visibility of HeapByteBuffer
assert(notMapped.getChunks().forall(_.getClass.getName.endsWith("HeapByteBuffer")),
"Expected HeapByteBuffer for un-mapped read")
assert(mapped.getChunks().forall(_.isInstanceOf[MappedByteBuffer]),
"Expected MappedByteBuffer for mapped read")
def arrayFromByteBuffer(in: ByteBuffer): Array[Byte] = {
val array = new Array[Byte](in.remaining())
in.get(array)
array
}
assert(Arrays.equals(mapped.toArray, bytes))
assert(Arrays.equals(notMapped.toArray, bytes))
}
}
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