Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/2882#discussion_r19195389
--- Diff:
streaming/src/test/scala/org/apache/spark/streaming/util/WriteAheadLogSuite.scala
---
@@ -0,0 +1,298 @@
+/*
+ * 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.streaming.util
+
+import java.io.{DataInputStream, File, FileInputStream, RandomAccessFile}
+import java.nio.ByteBuffer
+
+import scala.collection.mutable.ArrayBuffer
+import scala.concurrent.duration._
+import scala.language.implicitConversions
+import scala.language.postfixOps
+import scala.util.Random
+
+import WriteAheadLogSuite._
+import com.google.common.io.Files
+import org.apache.commons.io.FileUtils
+import org.apache.hadoop.conf.Configuration
+import org.apache.spark.util.Utils
+import org.scalatest.{BeforeAndAfter, FunSuite}
+import org.scalatest.concurrent.Eventually._
+
+/**
+ * This testsuite tests all classes related to write ahead logs.
+ */
+class WriteAheadLogSuite extends FunSuite with BeforeAndAfter {
+
+ val hadoopConf = new Configuration()
+ var tempDirectory: File = null
+
+ before {
+ tempDirectory = Files.createTempDir()
+ }
+
+ after {
+ if (tempDirectory != null && tempDirectory.exists()) {
+ FileUtils.deleteDirectory(tempDirectory)
+ tempDirectory = null
+ }
+ }
+
+ test("WriteAheadLogWriter - writing data") {
+ val file = new File(tempDirectory, Random.nextString(10))
+ val dataToWrite = generateRandomData()
+ val writer = new WriteAheadLogWriter("file:///" + file, hadoopConf)
+ val segments = dataToWrite.map(data => writer.write(data))
+ writer.close()
+ val writtenData = readDataManually(file, segments)
+ assert(writtenData.toArray === dataToWrite.toArray)
+ }
+
+ test("WriteAheadLogWriter - syncing of data by writing and reading
immediately") {
+ val file = new File(tempDirectory, Random.nextString(10))
+ val dataToWrite = generateRandomData()
+ val writer = new WriteAheadLogWriter("file:///" + file, hadoopConf)
+ dataToWrite.foreach { data =>
+ val segment = writer.write(data)
+ assert(readDataManually(file, Seq(segment)).head === data)
+ }
+ writer.close()
+ }
+
+ test("WriteAheadLogReader - sequentially reading data") {
+ // Write data manually for testing the sequential reader
+ val file = File.createTempFile("TestSequentialReads", "",
tempDirectory)
+ val writtenData = generateRandomData()
+ writeDataManually(writtenData, file)
+ val reader = new WriteAheadLogReader("file:///" + file.toString,
hadoopConf)
+ val readData = reader.toSeq.map(byteBufferToString)
+ assert(readData.toList === writtenData.toList)
+ assert(reader.hasNext === false)
+ intercept[Exception] {
+ reader.next()
+ }
+ reader.close()
+ }
+
+ test("WriteAheadLogReader - sequentially reading data written with
writer") {
+ // Write data manually for testing the sequential reader
+ val file = new File(tempDirectory, "TestWriter")
+ val dataToWrite = generateRandomData()
+ writeDataUsingWriter(file, dataToWrite)
+ val iter = dataToWrite.iterator
+ val reader = new WriteAheadLogReader("file:///" + file.toString,
hadoopConf)
+ reader.foreach { byteBuffer =>
+ assert(byteBufferToString(byteBuffer) === iter.next())
+ }
+ reader.close()
+ }
+
+ test("WriteAheadLogRandomReader - reading data using random reader") {
+ // Write data manually for testing the random reader
+ val file = File.createTempFile("TestRandomReads", "", tempDirectory)
+ val writtenData = generateRandomData()
+ val segments = writeDataManually(writtenData, file)
+
+ // Get a random order of these segments and read them back
+ val writtenDataAndSegments =
writtenData.zip(segments).toSeq.permutations.take(10).flatten
+ val reader = new WriteAheadLogRandomReader("file:///" + file.toString,
hadoopConf)
+ writtenDataAndSegments.foreach { case (data, segment) =>
+ assert(data === byteBufferToString(reader.read(segment)))
+ }
+ reader.close()
+ }
+
+ test("WriteAheadLogRandomReader - reading data using random reader
written with writer") {
+ // Write data using writer for testing the random reader
+ val file = new File(tempDirectory, "TestRandomReads")
+ val data = generateRandomData()
+ val segments = writeDataUsingWriter(file, data)
+
+ // Read a random sequence of segments and verify read data
+ val dataAndSegments =
data.zip(segments).toSeq.permutations.take(10).flatten
+ val reader = new WriteAheadLogRandomReader("file:///" + file.toString,
hadoopConf)
+ dataAndSegments.foreach { case(data, segment) =>
--- End diff --
Space after the open paren here.
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