BufferingBlockCreator -> NetworkReceiver.BlockGenerator

streaming/src/main/scala/spark/streaming/BufferingBlockCreator.scala

@@ -1,80 +0,0 @@
-package spark.streaming
-
-import java.util.concurrent.ArrayBlockingQueue
-import scala.collection.mutable.ArrayBuffer
-import spark.Logging
-import spark.streaming.util.{RecurringTimer, SystemClock}
-import spark.storage.StorageLevel
-
-/**
- * Batches objects created by a [[spark.streaming.NetworkReceiver]] and puts them into
- * appropriately named blocks at regular intervals. This class starts two threads,
- * one to periodically start a new batch and prepare the previous batch of as a block,
- * the other to push the blocks into the block manager.
- */
-class BufferingBlockCreator[T](receiver: NetworkReceiver[T], storageLevel: StorageLevel)
-  extends Serializable with Logging {
-
-  case class Block(id: String, iterator: Iterator[T], metadata: Any = null)
-
-  val clock = new SystemClock()
-  val blockInterval = 200L
-  val blockIntervalTimer = new RecurringTimer(clock, blockInterval, updateCurrentBuffer)
-  val blockStorageLevel = storageLevel
-  val blocksForPushing = new ArrayBlockingQueue[Block](1000)
-  val blockPushingThread = new Thread() { override def run() { keepPushingBlocks() } }
-
-  var currentBuffer = new ArrayBuffer[T]
-
-  def start() {
-    blockIntervalTimer.start()
-    blockPushingThread.start()
-    logInfo("Data handler started")
-  }
-
-  def stop() {
-    blockIntervalTimer.stop()
-    blockPushingThread.interrupt()
-    logInfo("Data handler stopped")
-  }
-
-  def += (obj: T) {
-    currentBuffer += obj
-  }
-
-  private def createBlock(blockId: String, iterator: Iterator[T]) : Block = {
-    new Block(blockId, iterator)
-  }
-
-  private def updateCurrentBuffer(time: Long) {
-    try {
-      val newBlockBuffer = currentBuffer
-      currentBuffer = new ArrayBuffer[T]
-      if (newBlockBuffer.size > 0) {
-        val blockId = "input-" + receiver.streamId + "- " + (time - blockInterval)
-        val newBlock = createBlock(blockId, newBlockBuffer.toIterator)
-        blocksForPushing.add(newBlock)
-      }
-    } catch {
-      case ie: InterruptedException =>
-        logInfo("Block interval timer thread interrupted")
-      case e: Exception =>
-        receiver.stop()
-    }
-  }
-
-  private def keepPushingBlocks() {
-    logInfo("Block pushing thread started")
-    try {
-      while(true) {
-        val block = blocksForPushing.take()
-        receiver.pushBlock(block.id, block.iterator, block.metadata, storageLevel)
-      }
-    } catch {
-      case ie: InterruptedException =>
-        logInfo("Block pushing thread interrupted")
-      case e: Exception =>
-        receiver.stop()
-    }
-  }
-}

streaming/src/main/scala/spark/streaming/dstream/FlumeInputDStream.scala

@@ -97,13 +97,13 @@ private[streaming] object SparkFlumeEvent {
 private[streaming]
 class FlumeEventServer(receiver : FlumeReceiver) extends AvroSourceProtocol {
   override def append(event : AvroFlumeEvent) : Status = {
-    receiver.dataHandler += SparkFlumeEvent.fromAvroFlumeEvent(event)
+    receiver.blockGenerator += SparkFlumeEvent.fromAvroFlumeEvent(event)
     Status.OK
   }
 
   override def appendBatch(events : java.util.List[AvroFlumeEvent]) : Status = {
     events.foreach (event =>
-      receiver.dataHandler += SparkFlumeEvent.fromAvroFlumeEvent(event))
+      receiver.blockGenerator += SparkFlumeEvent.fromAvroFlumeEvent(event))
     Status.OK
   }
 }
@@ -118,19 +118,19 @@ class FlumeReceiver(
     storageLevel: StorageLevel
   ) extends NetworkReceiver[SparkFlumeEvent](streamId) {
 
-  lazy val dataHandler = new BufferingBlockCreator(this, storageLevel)
+  lazy val blockGenerator = new BlockGenerator(storageLevel)
 
   protected override def onStart() {
     val responder = new SpecificResponder(
       classOf[AvroSourceProtocol], new FlumeEventServer(this));
     val server = new NettyServer(responder, new InetSocketAddress(host, port));
-    dataHandler.start()
+    blockGenerator.start()
     server.start()
     logInfo("Flume receiver started")
   }
 
   protected override def onStop() {
-    dataHandler.stop()
+    blockGenerator.stop()
     logInfo("Flume receiver stopped")
   }
 

streaming/src/main/scala/spark/streaming/dstream/KafkaInputDStream.scala

@@ -110,19 +110,19 @@ class KafkaReceiver(streamId: Int, host: String, port: Int, groupId: String,
   val ZK_TIMEOUT = 10000
 
   // Handles pushing data into the BlockManager
-  lazy protected val dataHandler = new BufferingBlockCreator(this, storageLevel)
+  lazy protected val blockGenerator = new BlockGenerator(storageLevel)
   // Keeps track of the current offsets. Maps from (broker, topic, group, part) -> Offset
   lazy val offsets = HashMap[KafkaPartitionKey, Long]()
   // Connection to Kafka
   var consumerConnector : ZookeeperConsumerConnector = null
 
   def onStop() {
-    dataHandler.stop()
+    blockGenerator.stop()
   }
 
   def onStart() {
 
-    dataHandler.start()
+    blockGenerator.start()
 
     // In case we are using multiple Threads to handle Kafka Messages
     val executorPool = Executors.newFixedThreadPool(topics.values.reduce(_ + _))
@@ -170,8 +170,8 @@ class KafkaReceiver(streamId: Int, host: String, port: Int, groupId: String,
   private class MessageHandler(stream: KafkaStream[String]) extends Runnable {
     def run() {
       logInfo("Starting MessageHandler.")
-      stream.takeWhile { msgAndMetadata => 
-        dataHandler += msgAndMetadata.message
+      stream.takeWhile { msgAndMetadata =>
+        blockGenerator += msgAndMetadata.message
 
         // Updating the offet. The key is (broker, topic, group, partition).
         val key = KafkaPartitionKey(msgAndMetadata.topicInfo.brokerId, msgAndMetadata.topic, 

streaming/src/main/scala/spark/streaming/dstream/NetworkInputDStream.scala

@@ -14,6 +14,8 @@ import akka.actor.{Props, Actor}
 import akka.pattern.ask
 import akka.dispatch.Await
 import akka.util.duration._
+import spark.streaming.util.{RecurringTimer, SystemClock}
+import java.util.concurrent.ArrayBlockingQueue
 
 abstract class NetworkInputDStream[T: ClassManifest](@transient ssc_ : StreamingContext)
   extends InputDStream[T](ssc_) {
@@ -154,4 +156,77 @@ abstract class NetworkReceiver[T: ClassManifest](val streamId: Int) extends Seri
         tracker ! DeregisterReceiver(streamId, msg)
     }
   }
+
+  /**
+   * Batches objects created by a [[spark.streaming.NetworkReceiver]] and puts them into
+   * appropriately named blocks at regular intervals. This class starts two threads,
+   * one to periodically start a new batch and prepare the previous batch of as a block,
+   * the other to push the blocks into the block manager.
+   */
+  class BlockGenerator(storageLevel: StorageLevel)
+    extends Serializable with Logging {
+
+    case class Block(id: String, iterator: Iterator[T], metadata: Any = null)
+
+    val clock = new SystemClock()
+    val blockInterval = 200L
+    val blockIntervalTimer = new RecurringTimer(clock, blockInterval, updateCurrentBuffer)
+    val blockStorageLevel = storageLevel
+    val blocksForPushing = new ArrayBlockingQueue[Block](1000)
+    val blockPushingThread = new Thread() { override def run() { keepPushingBlocks() } }
+
+    var currentBuffer = new ArrayBuffer[T]
+
+    def start() {
+      blockIntervalTimer.start()
+      blockPushingThread.start()
+      logInfo("Data handler started")
+    }
+
+    def stop() {
+      blockIntervalTimer.stop()
+      blockPushingThread.interrupt()
+      logInfo("Data handler stopped")
+    }
+
+    def += (obj: T) {
+      currentBuffer += obj
+    }
+
+    private def createBlock(blockId: String, iterator: Iterator[T]) : Block = {
+      new Block(blockId, iterator)
+    }
+
+    private def updateCurrentBuffer(time: Long) {
+      try {
+        val newBlockBuffer = currentBuffer
+        currentBuffer = new ArrayBuffer[T]
+        if (newBlockBuffer.size > 0) {
+          val blockId = "input-" + NetworkReceiver.this.streamId + "- " + (time - blockInterval)
+          val newBlock = createBlock(blockId, newBlockBuffer.toIterator)
+          blocksForPushing.add(newBlock)
+        }
+      } catch {
+        case ie: InterruptedException =>
+          logInfo("Block interval timer thread interrupted")
+        case e: Exception =>
+          NetworkReceiver.this.stop()
+      }
+    }
+
+    private def keepPushingBlocks() {
+      logInfo("Block pushing thread started")
+      try {
+        while(true) {
+          val block = blocksForPushing.take()
+          NetworkReceiver.this.pushBlock(block.id, block.iterator, block.metadata, storageLevel)
+        }
+      } catch {
+        case ie: InterruptedException =>
+          logInfo("Block pushing thread interrupted")
+        case e: Exception =>
+          NetworkReceiver.this.stop()
+      }
+    }
+  }
 }

streaming/src/main/scala/spark/streaming/dstream/SocketInputDStream.scala

@@ -29,7 +29,7 @@ class SocketReceiver[T: ClassManifest](
     storageLevel: StorageLevel
   ) extends NetworkReceiver[T](streamId) {
 
-  lazy protected val dataHandler = new BufferingBlockCreator(this, storageLevel)
+  lazy protected val blockGenerator = new BlockGenerator(storageLevel)
 
   override def getLocationPreference = None
 
@@ -37,16 +37,16 @@ class SocketReceiver[T: ClassManifest](
     logInfo("Connecting to " + host + ":" + port)
     val socket = new Socket(host, port)
     logInfo("Connected to " + host + ":" + port)
-    dataHandler.start()
+    blockGenerator.start()
     val iterator = bytesToObjects(socket.getInputStream())
     while(iterator.hasNext) {
       val obj = iterator.next
-      dataHandler += obj
+      blockGenerator += obj
     }
   }
 
   protected def onStop() {
-    dataHandler.stop()
+    blockGenerator.stop()
   }
 
 }