Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/9143#discussion_r44238297
--- Diff:
streaming/src/test/scala/org/apache/spark/streaming/util/WriteAheadLogUtilsSuite.scala
---
@@ -0,0 +1,286 @@
+/*
+ * 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.EOFException
+import java.nio.ByteBuffer
+import java.util
+
+import scala.collection.JavaConverters._
+import scala.collection.mutable.ArrayBuffer
+import scala.language.{implicitConversions, postfixOps}
+import scala.reflect.ClassTag
+
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.fs.Path
+import org.scalatest.PrivateMethodTester
+
+import org.apache.spark.{SparkException, SparkConf, SparkFunSuite}
+import org.apache.spark.util.{ManualClock, Utils}
+
+class WriteAheadLogUtilsSuite extends SparkFunSuite {
+ import WriteAheadLogSuite._
+
+ private val logDir = Utils.createTempDir().getAbsolutePath()
+ private val hadoopConf = new Configuration()
+
+ def assertDriverLogClass[T <: WriteAheadLog: ClassTag](
+ conf: SparkConf,
+ isBatched: Boolean = false): WriteAheadLog = {
+ val log = WriteAheadLogUtils.createLogForDriver(conf, logDir,
hadoopConf)
+ if (isBatched) {
+ assert(log.isInstanceOf[BatchedWriteAheadLog])
+ val parentLog = log.asInstanceOf[BatchedWriteAheadLog].wrappedLog
+ assert(parentLog.getClass === implicitly[ClassTag[T]].runtimeClass)
+ } else {
+ assert(log.getClass === implicitly[ClassTag[T]].runtimeClass)
+ }
+ log
+ }
+
+ def assertReceiverLogClass[T <: WriteAheadLog: ClassTag](conf:
SparkConf): WriteAheadLog = {
+ val log = WriteAheadLogUtils.createLogForReceiver(conf, logDir,
hadoopConf)
+ assert(log.getClass === implicitly[ClassTag[T]].runtimeClass)
+ log
+ }
+
+ test("log selection and creation") {
+
+ val emptyConf = new SparkConf() // no log configuration
+ assertDriverLogClass[FileBasedWriteAheadLog](emptyConf)
+ assertReceiverLogClass[FileBasedWriteAheadLog](emptyConf)
+
+ // Verify setting driver WAL class
+ val driverWALConf = new
SparkConf().set("spark.streaming.driver.writeAheadLog.class",
+ classOf[MockWriteAheadLog0].getName())
+ assertDriverLogClass[MockWriteAheadLog0](driverWALConf)
+ assertReceiverLogClass[FileBasedWriteAheadLog](driverWALConf)
+
+ // Verify setting receiver WAL class
+ val receiverWALConf = new
SparkConf().set("spark.streaming.receiver.writeAheadLog.class",
+ classOf[MockWriteAheadLog0].getName())
+ assertDriverLogClass[FileBasedWriteAheadLog](receiverWALConf)
+ assertReceiverLogClass[MockWriteAheadLog0](receiverWALConf)
+
+ // Verify setting receiver WAL class with 1-arg constructor
+ val receiverWALConf2 = new
SparkConf().set("spark.streaming.receiver.writeAheadLog.class",
+ classOf[MockWriteAheadLog1].getName())
+ assertReceiverLogClass[MockWriteAheadLog1](receiverWALConf2)
+
+ // Verify failure setting receiver WAL class with 2-arg constructor
+ intercept[SparkException] {
+ val receiverWALConf3 = new
SparkConf().set("spark.streaming.receiver.writeAheadLog.class",
+ classOf[MockWriteAheadLog2].getName())
+ assertReceiverLogClass[MockWriteAheadLog1](receiverWALConf3)
+ }
+ }
+
+ test("wrap WriteAheadLog in BatchedWriteAheadLog when batching is
enabled") {
+ def getBatchedSparkConf: SparkConf =
+ new
SparkConf().set("spark.streaming.driver.writeAheadLog.allowBatching", "true")
+
+ val justBatchingConf = getBatchedSparkConf
+ assertDriverLogClass[FileBasedWriteAheadLog](justBatchingConf,
isBatched = true)
+ assertReceiverLogClass[FileBasedWriteAheadLog](justBatchingConf)
+
+ // Verify setting driver WAL class
+ val driverWALConf =
getBatchedSparkConf.set("spark.streaming.driver.writeAheadLog.class",
+ classOf[MockWriteAheadLog0].getName())
+ assertDriverLogClass[MockWriteAheadLog0](driverWALConf, isBatched =
true)
+ assertReceiverLogClass[FileBasedWriteAheadLog](driverWALConf)
+
+ // Verify receivers are not wrapped
+ val receiverWALConf =
getBatchedSparkConf.set("spark.streaming.receiver.writeAheadLog.class",
+ classOf[MockWriteAheadLog0].getName())
+ assertDriverLogClass[FileBasedWriteAheadLog](receiverWALConf,
isBatched = true)
+ assertReceiverLogClass[MockWriteAheadLog0](receiverWALConf)
+ }
+}
+
+object WriteAheadLogSuite {
+
+ class MockWriteAheadLog0() extends WriteAheadLog {
+ override def write(record: ByteBuffer, time: Long):
WriteAheadLogRecordHandle = { null }
+ override def read(handle: WriteAheadLogRecordHandle): ByteBuffer = {
null }
+ override def readAll(): util.Iterator[ByteBuffer] = { null }
+ override def clean(threshTime: Long, waitForCompletion: Boolean): Unit
= { }
+ override def close(): Unit = { }
+ }
+
+ class MockWriteAheadLog1(val conf: SparkConf) extends
MockWriteAheadLog0()
+
+ class MockWriteAheadLog2(val conf: SparkConf, x: Int) extends
MockWriteAheadLog0()
+
+ private val hadoopConf = new Configuration()
+
+ /** Write data to a file directly and return an array of the file
segments written. */
+ def writeDataManually(data: Seq[String], file: String):
Seq[FileBasedWriteAheadLogSegment] = {
+ val segments = new ArrayBuffer[FileBasedWriteAheadLogSegment]()
+ val writer = HdfsUtils.getOutputStream(file, hadoopConf)
+ data.foreach { item =>
+ val offset = writer.getPos
+ val bytes = Utils.serialize(item)
+ writer.writeInt(bytes.size)
+ writer.write(bytes)
+ segments += FileBasedWriteAheadLogSegment(file, offset, bytes.size)
+ }
+ writer.close()
+ segments
+ }
+
+ /**
+ * Write data to a file using the writer class and return an array of
the file segments written.
+ */
+ def writeDataUsingWriter(
+ filePath: String,
+ data: Seq[String]): Seq[FileBasedWriteAheadLogSegment] = {
+ val writer = new FileBasedWriteAheadLogWriter(filePath, hadoopConf)
+ val segments = data.map {
+ item => writer.write(item)
+ }
+ writer.close()
+ segments
+ }
+
+ /** Write data to rotating files in log directory using the
WriteAheadLog class. */
+ def writeDataUsingWriteAheadLog(
+ logDirectory: String,
+ data: Seq[String],
+ closeFileAfterWrite: Boolean,
+ allowBatching: Boolean,
+ manualClock: ManualClock = new ManualClock,
+ closeLog: Boolean = true,
+ clockAdvanceTime: Int = 500): WriteAheadLog = {
+ if (manualClock.getTimeMillis() < 100000) manualClock.setTime(10000)
+ val wal = createWriteAheadLog(logDirectory, closeFileAfterWrite,
allowBatching)
+
+ // Ensure that 500 does not get sorted after 2000, so put a high base
value.
+ data.foreach { item =>
+ manualClock.advance(clockAdvanceTime)
+ wal.write(item, manualClock.getTimeMillis())
+ }
+ if (closeLog) wal.close()
+ wal
+ }
+
+ /** Read data from a segments of a log file directly and return the list
of byte buffers. */
+ def readDataManually(segments: Seq[FileBasedWriteAheadLogSegment]):
Seq[String] = {
+ segments.map { segment =>
+ val reader = HdfsUtils.getInputStream(segment.path, hadoopConf)
+ try {
+ reader.seek(segment.offset)
+ val bytes = new Array[Byte](segment.length)
+ reader.readInt()
+ reader.readFully(bytes)
+ val data = Utils.deserialize[String](bytes)
+ reader.close()
+ data
+ } finally {
+ reader.close()
+ }
+ }
+ }
+
+ /** Read all the data from a log file directly and return the list of
byte buffers. */
+ def readDataManually[T](file: String): Seq[T] = {
+ val reader = HdfsUtils.getInputStream(file, hadoopConf)
+ val buffer = new ArrayBuffer[T]
+ try {
+ while (true) {
+ // Read till EOF is thrown
+ val length = reader.readInt()
+ val bytes = new Array[Byte](length)
+ reader.read(bytes)
+ buffer += Utils.deserialize[T](bytes)
+ }
+ } catch {
+ case ex: EOFException =>
+ } finally {
+ reader.close()
+ }
+ buffer
+ }
+
+ /** Read all the data from a log file using reader class and return the
list of byte buffers. */
+ def readDataUsingReader(file: String): Seq[String] = {
+ val reader = new FileBasedWriteAheadLogReader(file, hadoopConf)
+ val readData = reader.toList.map(byteBufferToString)
+ reader.close()
+ readData
+ }
+
+ /** Read all the data in the log file in a directory using the
WriteAheadLog class. */
+ def readDataUsingWriteAheadLog(
+ logDirectory: String,
+ closeFileAfterWrite: Boolean,
+ allowBatching: Boolean): Seq[String] = {
+ val wal = createWriteAheadLog(logDirectory, closeFileAfterWrite,
allowBatching)
+ val data = wal.readAll().asScala.map(byteBufferToString).toSeq
+ wal.close()
+ data
+ }
+
+ /** Get the log files in a direction */
--- End diff --
nit: direction --> directory
---
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