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Added ReceivedBlockHandler and its associated tests
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144 changes: 144 additions & 0 deletions
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streaming/src/main/scala/org/apache/spark/streaming/receiver/ReceivedBlockHandler.scala
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| Original file line number | Diff line number | Diff line change |
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| package org.apache.spark.streaming.receiver | ||
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| import java.nio.ByteBuffer | ||
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| import scala.collection.mutable.ArrayBuffer | ||
| import scala.concurrent.{Await, ExecutionContext, Future} | ||
| import scala.concurrent.duration._ | ||
| import scala.language.{existentials, postfixOps} | ||
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| import WriteAheadLogBasedBlockHandler._ | ||
| import org.apache.hadoop.conf.Configuration | ||
| import org.apache.hadoop.fs.Path | ||
| import org.apache.spark.{SparkException, Logging, SparkConf} | ||
| import org.apache.spark.storage.{BlockManager, StorageLevel, StreamBlockId} | ||
| import org.apache.spark.streaming.util.{Clock, SystemClock, WriteAheadLogManager} | ||
| import org.apache.spark.util.Utils | ||
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| private[streaming] sealed trait ReceivedBlock | ||
| private[streaming] case class ArrayBufferBlock(arrayBuffer: ArrayBuffer[_]) extends ReceivedBlock | ||
| private[streaming] case class IteratorBlock(iterator: Iterator[_]) extends ReceivedBlock | ||
| private[streaming] case class ByteBufferBlock(byteBuffer: ByteBuffer) extends ReceivedBlock | ||
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| /** Trait that represents a class that handles the storage of blocks received by receiver */ | ||
| private[streaming] trait ReceivedBlockHandler { | ||
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| /** Store a received block with the given block id */ | ||
| def storeBlock(blockId: StreamBlockId, receivedBlock: ReceivedBlock): Option[AnyRef] | ||
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| /** Cleanup old blocks older than the given threshold time */ | ||
| def cleanupOldBlock(threshTime: Long) | ||
| } | ||
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| /** | ||
| * Implementation of a [[org.apache.spark.streaming.receiver.ReceivedBlockHandler]] which | ||
| * stores the received blocks into a block manager with the specified storage level. | ||
| */ | ||
| private[streaming] class BlockManagerBasedBlockHandler( | ||
| blockManager: BlockManager, storageLevel: StorageLevel) | ||
| extends ReceivedBlockHandler with Logging { | ||
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| def storeBlock(blockId: StreamBlockId, receivedBlock: ReceivedBlock): Option[AnyRef] = { | ||
| val putResult = receivedBlock match { | ||
| case ArrayBufferBlock(arrayBuffer) => | ||
| blockManager.putIterator(blockId, arrayBuffer.iterator, storageLevel, tellMaster = true) | ||
| case IteratorBlock(iterator) => | ||
| blockManager.putIterator(blockId, iterator, storageLevel, tellMaster = true) | ||
| case ByteBufferBlock(byteBuffer) => | ||
| blockManager.putBytes(blockId, byteBuffer, storageLevel, tellMaster = true) | ||
| case _ => | ||
| throw new SparkException(s"Could not store $blockId to block manager, unexpected block type") | ||
| } | ||
| if (!putResult.map { _._1 }.contains(blockId)) { | ||
| throw new SparkException( | ||
| s"Could not store $blockId to block manager with storage level $storageLevel") | ||
| } | ||
| None | ||
| } | ||
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| def cleanupOldBlock(threshTime: Long) { | ||
| // this is not used as blocks inserted into the BlockManager are cleared by DStream's clearing | ||
| // of BlockRDDs. | ||
| } | ||
| } | ||
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| /** | ||
| * Implementation of a [[org.apache.spark.streaming.receiver.ReceivedBlockHandler]] which | ||
| * stores the received blocks in both, a write ahead log and a block manager. | ||
| */ | ||
| private[streaming] class WriteAheadLogBasedBlockHandler( | ||
| blockManager: BlockManager, | ||
| streamId: Int, | ||
| storageLevel: StorageLevel, | ||
| conf: SparkConf, | ||
| hadoopConf: Configuration, | ||
| checkpointDir: String, | ||
| clock: Clock = new SystemClock | ||
| ) extends ReceivedBlockHandler with Logging { | ||
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| private val blockStoreTimeout = conf.getInt( | ||
| "spark.streaming.receiver.blockStoreTimeout", 30).seconds | ||
| private val rollingInterval = conf.getInt( | ||
| "spark.streaming.receiver.writeAheadLog.rollingInterval", 60) | ||
| private val maxFailures = conf.getInt( | ||
| "spark.streaming.receiver.writeAheadLog.maxFailures", 3) | ||
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| private val logManager = new WriteAheadLogManager( | ||
| checkpointDirToLogDir(checkpointDir, streamId), | ||
| hadoopConf, rollingInterval, maxFailures, | ||
| callerName = "WriteAheadLogBasedBlockHandler", | ||
| clock = clock | ||
| ) | ||
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| // For processing futures used in parallel block storing into block manager and write ahead log | ||
| implicit private val executionContext = ExecutionContext.fromExecutorService( | ||
| Utils.newDaemonFixedThreadPool(1, "WriteAheadLogBasedBlockHandler")) | ||
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| def storeBlock(blockId: StreamBlockId, receivedBlock: ReceivedBlock): Option[AnyRef] = { | ||
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| // Serialize the block so that it can be inserted into both | ||
| val serializedBlock = receivedBlock match { | ||
| case ArrayBufferBlock(arrayBuffer) => | ||
| blockManager.dataSerialize(blockId, arrayBuffer.iterator) | ||
| case IteratorBlock(iterator) => | ||
| blockManager.dataSerialize(blockId, iterator) | ||
| case ByteBufferBlock(byteBuffer) => | ||
| byteBuffer | ||
| case _ => | ||
| throw new Exception(s"Could not push $blockId to block manager, unexpected block type") | ||
| } | ||
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| val pushToBlockManagerFuture = Future { | ||
| val putResult = | ||
| blockManager.putBytes(blockId, serializedBlock, storageLevel, tellMaster = true) | ||
| if (!putResult.map { _._1 }.contains(blockId)) { | ||
| throw new SparkException( | ||
| s"Could not store $blockId to block manager with storage level $storageLevel") | ||
| } | ||
| } | ||
| val pushToLogFuture = Future { | ||
| logManager.writeToLog(serializedBlock) | ||
| } | ||
| val combinedFuture = for { | ||
| _ <- pushToBlockManagerFuture | ||
| fileSegment <- pushToLogFuture | ||
| } yield fileSegment | ||
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| Some(Await.result(combinedFuture, blockStoreTimeout)) | ||
| } | ||
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| def cleanupOldBlock(threshTime: Long) { | ||
| logManager.cleanupOldLogs(threshTime) | ||
| } | ||
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| def stop() { | ||
| logManager.stop() | ||
| } | ||
| } | ||
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| private[streaming] object WriteAheadLogBasedBlockHandler { | ||
| def checkpointDirToLogDir(checkpointDir: String, streamId: Int): String = { | ||
| new Path(checkpointDir, new Path("receivedData", streamId.toString)).toString | ||
| } | ||
| } |
14 changes: 14 additions & 0 deletions
14
streaming/src/main/scala/org/apache/spark/streaming/receiver/ReceivedBlockInfo.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| package org.apache.spark.streaming.receiver | ||
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| import org.apache.spark.storage.StreamBlockId | ||
| import org.apache.spark.streaming.util.WriteAheadLogFileSegment | ||
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| /** Information about blocks received by the receiver */ | ||
| private[streaming] case class ReceivedBlockInfo( | ||
| streamId: Int, | ||
| blockId: StreamBlockId, | ||
| numRecords: Long, | ||
| metadata: Any, | ||
| fileSegmentOption: Option[WriteAheadLogFileSegment] | ||
| ) | ||
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