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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.shuffle.hash
import java.io.{File, FileWriter}
import scala.language.reflectiveCalls
import org.scalatest.FunSuite
import org.apache.spark.{SparkEnv, SparkContext, LocalSparkContext, SparkConf}
import org.apache.spark.executor.ShuffleWriteMetrics
import org.apache.spark.network.buffer.{FileSegmentManagedBuffer, ManagedBuffer}
import org.apache.spark.serializer.JavaSerializer
import org.apache.spark.shuffle.FileShuffleBlockManager
import org.apache.spark.storage.{ShuffleBlockId, FileSegment}
class HashShuffleManagerSuite extends FunSuite with LocalSparkContext {
private val testConf = new SparkConf(false)
private def checkSegments(expected: FileSegment, buffer: ManagedBuffer) {
assert(buffer.isInstanceOf[FileSegmentManagedBuffer])
val segment = buffer.asInstanceOf[FileSegmentManagedBuffer]
assert(expected.file.getCanonicalPath === segment.getFile.getCanonicalPath)
assert(expected.offset === segment.getOffset)
assert(expected.length === segment.getLength)
}
test("consolidated shuffle can write to shuffle group without messing existing offsets/lengths") {
val conf = new SparkConf(false)
// reset after EACH object write. This is to ensure that there are bytes appended after
// an object is written. So if the codepaths assume writeObject is end of data, this should
// flush those bugs out. This was common bug in ExternalAppendOnlyMap, etc.
conf.set("spark.serializer.objectStreamReset", "1")
conf.set("spark.serializer", "org.apache.spark.serializer.JavaSerializer")
conf.set("spark.shuffle.manager", "org.apache.spark.shuffle.hash.HashShuffleManager")
sc = new SparkContext("local", "test", conf)
val shuffleBlockManager =
SparkEnv.get.shuffleManager.shuffleBlockResolver.asInstanceOf[FileShuffleBlockManager]
val shuffle1 = shuffleBlockManager.forMapTask(1, 1, 1, new JavaSerializer(conf),
new ShuffleWriteMetrics)
for (writer <- shuffle1.writers) {
writer.write("test1", "value")
writer.write("test2", "value")
}
for (writer <- shuffle1.writers) {
writer.commitAndClose()
}
val shuffle1Segment = shuffle1.writers(0).fileSegment()
shuffle1.releaseWriters(success = true)
val shuffle2 = shuffleBlockManager.forMapTask(1, 2, 1, new JavaSerializer(conf),
new ShuffleWriteMetrics)
for (writer <- shuffle2.writers) {
writer.write("test3", "value")
writer.write("test4", "vlue")
}
for (writer <- shuffle2.writers) {
writer.commitAndClose()
}
val shuffle2Segment = shuffle2.writers(0).fileSegment()
shuffle2.releaseWriters(success = true)
// Now comes the test :
// Write to shuffle 3; and close it, but before registering it, check if the file lengths for
// previous task (forof shuffle1) is the same as 'segments'. Earlier, we were inferring length
// of block based on remaining data in file : which could mess things up when there is
// concurrent read and writes happening to the same shuffle group.
val shuffle3 = shuffleBlockManager.forMapTask(1, 3, 1, new JavaSerializer(testConf),
new ShuffleWriteMetrics)
for (writer <- shuffle3.writers) {
writer.write("test3", "value")
writer.write("test4", "value")
}
for (writer <- shuffle3.writers) {
writer.commitAndClose()
}
// check before we register.
checkSegments(shuffle2Segment, shuffleBlockManager.getBlockData(ShuffleBlockId(1, 2, 0)))
shuffle3.releaseWriters(success = true)
checkSegments(shuffle2Segment, shuffleBlockManager.getBlockData(ShuffleBlockId(1, 2, 0)))
shuffleBlockManager.removeShuffle(1)
}
def writeToFile(file: File, numBytes: Int) {
val writer = new FileWriter(file, true)
for (i <- 0 until numBytes) writer.write(i)
writer.close()
}
}
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