[SPARK-25778] WriteAheadLogBackedBlockRDD in YARN Cluster Mode Fails due to lack of access to java.io.tmpdir in HDFS

WriteAheadLogBackedBlockRDD usage of java.io.tmpdir will fail if $PWD resolves to a folder in HDFS and the Spark YARN Cluster job does not have the correct access to this folder in regards to the dummy folder. So the fix is to pass the locally resolved dummy folder to the createLogForReceiver with the correct nonExistantDirectory

Author: gss2002

streaming/src/main/scala/org/apache/spark/streaming/rdd/WriteAheadLogBackedBlockRDD.scala

@@ -136,7 +136,7 @@ class WriteAheadLogBackedBlockRDD[T: ClassTag](
         // this dummy directory should not already exist otherwise the WAL will try to recover
         // past events from the directory and throw errors.
         val nonExistentDirectory = new File(
-          System.getProperty("java.io.tmpdir"), UUID.randomUUID().toString).getAbsolutePath
+          System.getProperty("java.io.tmpdir"), UUID.randomUUID().toString).toURI.toString
         writeAheadLog = WriteAheadLogUtils.createLogForReceiver(
           SparkEnv.get.conf, nonExistentDirectory, hadoopConf)
         dataRead = writeAheadLog.read(partition.walRecordHandle)