Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/2931#discussion_r19587466
--- Diff:
streaming/src/test/scala/org/apache/spark/streaming/rdd/WriteAheadLogBackedBlockRDDSuite.scala
---
@@ -0,0 +1,155 @@
+/*
+ * 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.rdd
+
+import java.io.File
+
+import scala.util.Random
+
+import com.google.common.io.Files
+import org.apache.hadoop.conf.Configuration
+import org.scalatest.{BeforeAndAfterAll, FunSuite}
+
+import org.apache.spark.{SparkConf, SparkContext}
+import org.apache.spark.storage.{BlockId, BlockManager, StorageLevel,
StreamBlockId}
+import org.apache.spark.streaming.util.{WriteAheadLogFileSegment,
WriteAheadLogWriter}
+
+class WriteAheadLogBackedBlockRDDSuite extends FunSuite with
BeforeAndAfterAll {
+ val conf = new SparkConf()
+ .setMaster("local[2]")
+ .setAppName(this.getClass.getSimpleName)
+ val hadoopConf = new Configuration()
+
+ var sparkContext: SparkContext = null
+ var blockManager: BlockManager = null
+ var dir: File = null
+
+ override def beforeAll(): Unit = {
+ sparkContext = new SparkContext(conf)
+ blockManager = sparkContext.env.blockManager
+ dir = Files.createTempDir()
+ }
+
+ override def afterAll(): Unit = {
+ // Copied from LocalSparkContext, simpler than to introduced test
dependencies to core tests.
+ sparkContext.stop()
+ dir.delete()
+ System.clearProperty("spark.driver.port")
+ }
+
+ test("Read data available in block manager and write ahead log") {
+ testRDD(5, 5)
+ }
+
+ test("Read data available only in block manager, not in write ahead
log") {
+ testRDD(5, 0)
+ }
+
+ test("Read data available only in write ahead log, not in block
manager") {
+ testRDD(0, 5)
+ }
+
+ test("Read data available only in write ahead log, and test storing in
block manager") {
+ testRDD(0, 5, testStoreInBM = true)
+ }
+
+ test("Read data with partially available in block manager, and rest in
write ahead log") {
+ testRDD(3, 2)
+ }
+
+ /**
+ * Test the WriteAheadLogBackedRDD, by writing some partitions of the
data to block manager
+ * and the rest to a write ahead log, and then reading reading it all
back using the RDD.
+ * It can also test if the partitions that were read from the log were
again stored in
+ * block manager.
+ * @param numPartitionssInBM Number of partitions to write to the Block
Manager
+ * @param numPartitionsInWAL Number of partitions to write to the Write
Ahead Log
+ * @param testStoreInBM Test whether blocks read from log are stored
back into block manager
+ */
+ private def testRDD(
+ numPartitionssInBM: Int,
+ numPartitionsInWAL: Int,
+ testStoreInBM: Boolean = false
+ ) {
+ val numBlocks = numPartitionssInBM + numPartitionsInWAL
+ val data = Seq.tabulate(numBlocks) { _ => Seq.fill(10) {
scala.util.Random.nextString(50) } }
--- End diff --
Nice! Right!
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