[SPARK-10128] [STREAMING] Used correct classloader to deserialize WAL…

… data

Recovering Kinesis sequence numbers from WAL leads to classnotfoundexception because the ObjectInputStream does not use the correct classloader and the SequenceNumberRanges class (in streaming-kinesis-asl package) cannot be found (added through spark-submit) while deserializing. The solution is to use `Thread.currentThread().getContextClassLoader` while deserializing.

Author: Tathagata Das <[email protected]>

Closes #8328 from tdas/SPARK-10128 and squashes the following commits:

f19b1c2 [Tathagata Das] Used correct classloader to deserialize WAL data

streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceivedBlockTracker.scala

@@ -28,7 +28,7 @@ import org.apache.hadoop.fs.Path
 import org.apache.spark.streaming.Time
 import org.apache.spark.streaming.util.{WriteAheadLog, WriteAheadLogUtils}
 import org.apache.spark.util.{Clock, Utils}
-import org.apache.spark.{Logging, SparkConf, SparkException}
+import org.apache.spark.{Logging, SparkConf}
 
 /** Trait representing any event in the ReceivedBlockTracker that updates its state. */
 private[streaming] sealed trait ReceivedBlockTrackerLogEvent
@@ -199,7 +199,8 @@ private[streaming] class ReceivedBlockTracker(
       import scala.collection.JavaConversions._
       writeAheadLog.readAll().foreach { byteBuffer =>
         logTrace("Recovering record " + byteBuffer)
-        Utils.deserialize[ReceivedBlockTrackerLogEvent](byteBuffer.array) match {
+        Utils.deserialize[ReceivedBlockTrackerLogEvent](
+          byteBuffer.array, Thread.currentThread().getContextClassLoader) match {
           case BlockAdditionEvent(receivedBlockInfo) =>
             insertAddedBlock(receivedBlockInfo)
           case BatchAllocationEvent(time, allocatedBlocks) =>