[SPARK-6627] Finished rename to ShuffleBlockResolver

kayousterhout · kayousterhout · commit d8a5d369dd13 · 2015-04-28T17:03:31.000-07:00
The previous cleanup-commit for SPARK-6627 renamed ShuffleBlockManager
to ShuffleBlockResolver, but didn't rename the associated subclasses and
variables; this commit does that.
diff --git a/core/src/main/scala/org/apache/spark/shuffle/FileShuffleBlockResolver.scala b/core/src/main/scala/org/apache/spark/shuffle/FileShuffleBlockResolver.scala
@@ -18,7 +18,6 @@
 package org.apache.spark.shuffle
 
 import java.io.File
-import java.nio.ByteBuffer
 import java.util.concurrent.ConcurrentLinkedQueue
 import java.util.concurrent.atomic.AtomicInteger
 
@@ -29,7 +28,7 @@ import org.apache.spark.executor.ShuffleWriteMetrics
 import org.apache.spark.network.buffer.{FileSegmentManagedBuffer, ManagedBuffer}
 import org.apache.spark.network.netty.SparkTransportConf
 import org.apache.spark.serializer.Serializer
-import org.apache.spark.shuffle.FileShuffleBlockManager.ShuffleFileGroup
+import org.apache.spark.shuffle.FileShuffleBlockResolver.ShuffleFileGroup
 import org.apache.spark.storage._
 import org.apache.spark.util.{MetadataCleaner, MetadataCleanerType, TimeStampedHashMap}
 import org.apache.spark.util.collection.{PrimitiveKeyOpenHashMap, PrimitiveVector}
@@ -64,9 +63,9 @@ private[spark] trait ShuffleWriterGroup {
  * files within a ShuffleFileGroups associated with the block's reducer.
  */
 // Note: Changes to the format in this file should be kept in sync with
-// org.apache.spark.network.shuffle.StandaloneShuffleBlockManager#getHashBasedShuffleBlockData().
+// org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#getHashBasedShuffleBlockData().
 private[spark]
-class FileShuffleBlockManager(conf: SparkConf)
+class FileShuffleBlockResolver(conf: SparkConf)
   extends ShuffleBlockResolver with Logging {
 
   private val transportConf = SparkTransportConf.fromSparkConf(conf)
@@ -243,7 +242,7 @@ class FileShuffleBlockManager(conf: SparkConf)
 }
 
 private[spark]
-object FileShuffleBlockManager {
+object FileShuffleBlockResolver {
   /**
    * A group of shuffle files, one per reducer.
    * A particular mapper will be assigned a single ShuffleFileGroup to write its output to.
diff --git a/core/src/main/scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala b/core/src/main/scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala
@@ -18,7 +18,6 @@
 package org.apache.spark.shuffle
 
 import java.io._
-import java.nio.ByteBuffer
 
 import com.google.common.io.ByteStreams
 
@@ -28,7 +27,7 @@ import org.apache.spark.network.netty.SparkTransportConf
 import org.apache.spark.storage._
 import org.apache.spark.util.Utils
 
-import IndexShuffleBlockManager.NOOP_REDUCE_ID
+import IndexShuffleBlockResolver.NOOP_REDUCE_ID
 
 /**
  * Create and maintain the shuffle blocks' mapping between logic block and physical file location.
@@ -40,9 +39,9 @@ import IndexShuffleBlockManager.NOOP_REDUCE_ID
  *
  */
 // Note: Changes to the format in this file should be kept in sync with
-// org.apache.spark.network.shuffle.StandaloneShuffleBlockManager#getSortBasedShuffleBlockData().
+// org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#getSortBasedShuffleBlockData().
 private[spark]
-class IndexShuffleBlockManager(conf: SparkConf) extends ShuffleBlockResolver {
+class IndexShuffleBlockResolver(conf: SparkConf) extends ShuffleBlockResolver {
 
   private lazy val blockManager = SparkEnv.get.blockManager
 
@@ -115,7 +114,7 @@ class IndexShuffleBlockManager(conf: SparkConf) extends ShuffleBlockResolver {
   override def stop(): Unit = {}
 }
 
-private[spark] object IndexShuffleBlockManager {
+private[spark] object IndexShuffleBlockResolver {
   // No-op reduce ID used in interactions with disk store and BlockObjectWriter.
   // The disk store currently expects puts to relate to a (map, reduce) pair, but in the sort
   // shuffle outputs for several reduces are glommed into a single file.
diff --git a/core/src/main/scala/org/apache/spark/shuffle/hash/HashShuffleManager.scala b/core/src/main/scala/org/apache/spark/shuffle/hash/HashShuffleManager.scala
@@ -26,7 +26,7 @@ import org.apache.spark.shuffle._
  */
 private[spark] class HashShuffleManager(conf: SparkConf) extends ShuffleManager {
 
-  private val fileShuffleBlockManager = new FileShuffleBlockManager(conf)
+  private val fileShuffleBlockResolver = new FileShuffleBlockResolver(conf)
 
   /* Register a shuffle with the manager and obtain a handle for it to pass to tasks. */
   override def registerShuffle[K, V, C](
@@ -61,8 +61,8 @@ private[spark] class HashShuffleManager(conf: SparkConf) extends ShuffleManager
     shuffleBlockResolver.removeShuffle(shuffleId)
   }
 
-  override def shuffleBlockResolver: FileShuffleBlockManager = {
-    fileShuffleBlockManager
+  override def shuffleBlockResolver: FileShuffleBlockResolver = {
+    fileShuffleBlockResolver
   }
 
   /** Shut down this ShuffleManager. */
diff --git a/core/src/main/scala/org/apache/spark/shuffle/hash/HashShuffleWriter.scala b/core/src/main/scala/org/apache/spark/shuffle/hash/HashShuffleWriter.scala
@@ -25,7 +25,7 @@ import org.apache.spark.shuffle._
 import org.apache.spark.storage.BlockObjectWriter
 
 private[spark] class HashShuffleWriter[K, V](
-    shuffleBlockManager: FileShuffleBlockManager,
+    shuffleBlockResolver: FileShuffleBlockResolver,
     handle: BaseShuffleHandle[K, V, _],
     mapId: Int,
     context: TaskContext)
@@ -45,7 +45,7 @@ private[spark] class HashShuffleWriter[K, V](
 
   private val blockManager = SparkEnv.get.blockManager
   private val ser = Serializer.getSerializer(dep.serializer.getOrElse(null))
-  private val shuffle = shuffleBlockManager.forMapTask(dep.shuffleId, mapId, numOutputSplits, ser,
+  private val shuffle = shuffleBlockResolver.forMapTask(dep.shuffleId, mapId, numOutputSplits, ser,
     writeMetrics)
 
   /** Write a bunch of records to this task's output */
diff --git a/core/src/main/scala/org/apache/spark/shuffle/sort/SortShuffleManager.scala b/core/src/main/scala/org/apache/spark/shuffle/sort/SortShuffleManager.scala
@@ -25,7 +25,7 @@ import org.apache.spark.shuffle.hash.HashShuffleReader
 
 private[spark] class SortShuffleManager(conf: SparkConf) extends ShuffleManager {
 
-  private val indexShuffleBlockManager = new IndexShuffleBlockManager(conf)
+  private val indexShuffleBlockResolver = new IndexShuffleBlockResolver(conf)
   private val shuffleMapNumber = new ConcurrentHashMap[Int, Int]()
 
   /**
@@ -72,8 +72,8 @@ private[spark] class SortShuffleManager(conf: SparkConf) extends ShuffleManager
     true
   }
 
-  override def shuffleBlockResolver: IndexShuffleBlockManager = {
-    indexShuffleBlockManager
+  override def shuffleBlockResolver: IndexShuffleBlockResolver = {
+    indexShuffleBlockResolver
   }
 
   /** Shut down this ShuffleManager. */
diff --git a/core/src/main/scala/org/apache/spark/shuffle/sort/SortShuffleWriter.scala b/core/src/main/scala/org/apache/spark/shuffle/sort/SortShuffleWriter.scala
@@ -20,12 +20,12 @@ package org.apache.spark.shuffle.sort
 import org.apache.spark.{MapOutputTracker, SparkEnv, Logging, TaskContext}
 import org.apache.spark.executor.ShuffleWriteMetrics
 import org.apache.spark.scheduler.MapStatus
-import org.apache.spark.shuffle.{IndexShuffleBlockManager, ShuffleWriter, BaseShuffleHandle}
+import org.apache.spark.shuffle.{IndexShuffleBlockResolver, ShuffleWriter, BaseShuffleHandle}
 import org.apache.spark.storage.ShuffleBlockId
 import org.apache.spark.util.collection.ExternalSorter
 
 private[spark] class SortShuffleWriter[K, V, C](
-    shuffleBlockManager: IndexShuffleBlockManager,
+    shuffleBlockResolver: IndexShuffleBlockResolver,
     handle: BaseShuffleHandle[K, V, C],
     mapId: Int,
     context: TaskContext)
@@ -65,10 +65,10 @@ private[spark] class SortShuffleWriter[K, V, C](
     // Don't bother including the time to open the merged output file in the shuffle write time,
     // because it just opens a single file, so is typically too fast to measure accurately
     // (see SPARK-3570).
-    val outputFile = shuffleBlockManager.getDataFile(dep.shuffleId, mapId)
-    val blockId = ShuffleBlockId(dep.shuffleId, mapId, IndexShuffleBlockManager.NOOP_REDUCE_ID)
+    val outputFile = shuffleBlockResolver.getDataFile(dep.shuffleId, mapId)
+    val blockId = ShuffleBlockId(dep.shuffleId, mapId, IndexShuffleBlockResolver.NOOP_REDUCE_ID)
     val partitionLengths = sorter.writePartitionedFile(blockId, context, outputFile)
-    shuffleBlockManager.writeIndexFile(dep.shuffleId, mapId, partitionLengths)
+    shuffleBlockResolver.writeIndexFile(dep.shuffleId, mapId, partitionLengths)
 
     mapStatus = MapStatus(blockManager.shuffleServerId, partitionLengths)
   }
@@ -84,7 +84,7 @@ private[spark] class SortShuffleWriter[K, V, C](
         return Option(mapStatus)
       } else {
         // The map task failed, so delete our output data.
-        shuffleBlockManager.removeDataByMap(dep.shuffleId, mapId)
+        shuffleBlockResolver.removeDataByMap(dep.shuffleId, mapId)
         return None
       }
     } finally {
diff --git a/core/src/main/scala/org/apache/spark/storage/BlockId.scala b/core/src/main/scala/org/apache/spark/storage/BlockId.scala
@@ -54,7 +54,7 @@ case class RDDBlockId(rddId: Int, splitIndex: Int) extends BlockId {
 }
 
 // Format of the shuffle block ids (including data and index) should be kept in sync with
-// org.apache.spark.network.shuffle.StandaloneShuffleBlockManager#getBlockData().
+// org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#getBlockData().
 @DeveloperApi
 case class ShuffleBlockId(shuffleId: Int, mapId: Int, reduceId: Int) extends BlockId {
   override def name: String = "shuffle_" + shuffleId + "_" + mapId + "_" + reduceId
diff --git a/core/src/main/scala/org/apache/spark/storage/BlockManager.scala b/core/src/main/scala/org/apache/spark/storage/BlockManager.scala
@@ -436,10 +436,11 @@ private[spark] class BlockManager(
     // As an optimization for map output fetches, if the block is for a shuffle, return it
     // without acquiring a lock; the disk store never deletes (recent) items so this should work
     if (blockId.isShuffle) {
-      val shuffleBlockManager = shuffleManager.shuffleBlockResolver
+      val shuffleBlockResolver = shuffleManager.shuffleBlockResolver
       // TODO: This should gracefully handle case where local block is not available. Currently
       // downstream code will throw an exception.
-      Option(shuffleBlockManager.getBlockData(blockId.asInstanceOf[ShuffleBlockId]).nioByteBuffer())
+      Option(
+        shuffleBlockResolver.getBlockData(blockId.asInstanceOf[ShuffleBlockId]).nioByteBuffer())
     } else {
       doGetLocal(blockId, asBlockResult = false).asInstanceOf[Option[ByteBuffer]]
     }
diff --git a/core/src/main/scala/org/apache/spark/storage/DiskBlockManager.scala b/core/src/main/scala/org/apache/spark/storage/DiskBlockManager.scala
@@ -55,7 +55,7 @@ private[spark] class DiskBlockManager(blockManager: BlockManager, conf: SparkCon
 
   /** Looks up a file by hashing it into one of our local subdirectories. */
   // This method should be kept in sync with
-  // org.apache.spark.network.shuffle.StandaloneShuffleBlockManager#getFile().
+  // org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#getFile().
   def getFile(filename: String): File = {
     // Figure out which local directory it hashes to, and which subdirectory in that
     val hash = Utils.nonNegativeHash(filename)
diff --git a/core/src/test/scala/org/apache/spark/shuffle/hash/HashShuffleManagerSuite.scala b/core/src/test/scala/org/apache/spark/shuffle/hash/HashShuffleManagerSuite.scala
@@ -27,7 +27,7 @@ import org.apache.spark.{SparkEnv, SparkContext, LocalSparkContext, SparkConf}
 import org.apache.spark.executor.ShuffleWriteMetrics
 import org.apache.spark.network.buffer.{FileSegmentManagedBuffer, ManagedBuffer}
 import org.apache.spark.serializer.JavaSerializer
-import org.apache.spark.shuffle.FileShuffleBlockManager
+import org.apache.spark.shuffle.FileShuffleBlockResolver
 import org.apache.spark.storage.{ShuffleBlockId, FileSegment}
 
 class HashShuffleManagerSuite extends FunSuite with LocalSparkContext {
@@ -53,10 +53,10 @@ class HashShuffleManagerSuite extends FunSuite with LocalSparkContext {
 
     sc = new SparkContext("local", "test", conf)
 
-    val shuffleBlockManager =
-      SparkEnv.get.shuffleManager.shuffleBlockResolver.asInstanceOf[FileShuffleBlockManager]
+    val shuffleBlockResolver =
+      SparkEnv.get.shuffleManager.shuffleBlockResolver.asInstanceOf[FileShuffleBlockResolver]
 
-    val shuffle1 = shuffleBlockManager.forMapTask(1, 1, 1, new JavaSerializer(conf),
+    val shuffle1 = shuffleBlockResolver.forMapTask(1, 1, 1, new JavaSerializer(conf),
       new ShuffleWriteMetrics)
     for (writer <- shuffle1.writers) {
       writer.write("test1")
@@ -69,7 +69,7 @@ class HashShuffleManagerSuite extends FunSuite with LocalSparkContext {
     val shuffle1Segment = shuffle1.writers(0).fileSegment()
     shuffle1.releaseWriters(success = true)
 
-    val shuffle2 = shuffleBlockManager.forMapTask(1, 2, 1, new JavaSerializer(conf),
+    val shuffle2 = shuffleBlockResolver.forMapTask(1, 2, 1, new JavaSerializer(conf),
       new ShuffleWriteMetrics)
 
     for (writer <- shuffle2.writers) {
@@ -88,7 +88,7 @@ class HashShuffleManagerSuite extends FunSuite with LocalSparkContext {
     // of block based on remaining data in file : which could mess things up when there is
     // concurrent read and writes happening to the same shuffle group.
 
-    val shuffle3 = shuffleBlockManager.forMapTask(1, 3, 1, new JavaSerializer(testConf),
+    val shuffle3 = shuffleBlockResolver.forMapTask(1, 3, 1, new JavaSerializer(testConf),
       new ShuffleWriteMetrics)
     for (writer <- shuffle3.writers) {
       writer.write("test3")
@@ -98,10 +98,10 @@ class HashShuffleManagerSuite extends FunSuite with LocalSparkContext {
       writer.commitAndClose()
     }
     // check before we register.
-    checkSegments(shuffle2Segment, shuffleBlockManager.getBlockData(ShuffleBlockId(1, 2, 0)))
+    checkSegments(shuffle2Segment, shuffleBlockResolver.getBlockData(ShuffleBlockId(1, 2, 0)))
     shuffle3.releaseWriters(success = true)
-    checkSegments(shuffle2Segment, shuffleBlockManager.getBlockData(ShuffleBlockId(1, 2, 0)))
-    shuffleBlockManager.removeShuffle(1)
+    checkSegments(shuffle2Segment, shuffleBlockResolver.getBlockData(ShuffleBlockId(1, 2, 0)))
+    shuffleBlockResolver.removeShuffle(1)
   }
 
   def writeToFile(file: File, numBytes: Int) {
diff --git a/network/shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalShuffleBlockHandler.java b/network/shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalShuffleBlockHandler.java
@@ -46,18 +46,18 @@
 public class ExternalShuffleBlockHandler extends RpcHandler {
   private final Logger logger = LoggerFactory.getLogger(ExternalShuffleBlockHandler.class);
 
-  private final ExternalShuffleBlockManager blockManager;
+  private final ExternalShuffleBlockResolver blockManager;
   private final OneForOneStreamManager streamManager;
 
   public ExternalShuffleBlockHandler(TransportConf conf) {
-    this(new OneForOneStreamManager(), new ExternalShuffleBlockManager(conf));
+    this(new OneForOneStreamManager(), new ExternalShuffleBlockResolver(conf));
   }
 
   /** Enables mocking out the StreamManager and BlockManager. */
   @VisibleForTesting
   ExternalShuffleBlockHandler(
       OneForOneStreamManager streamManager,
-      ExternalShuffleBlockManager blockManager) {
+      ExternalShuffleBlockResolver blockManager) {
     this.streamManager = streamManager;
     this.blockManager = blockManager;
   }
diff --git a/network/shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalShuffleBlockResolver.java b/network/shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalShuffleBlockResolver.java
@@ -44,13 +44,13 @@
  * Manages converting shuffle BlockIds into physical segments of local files, from a process outside
  * of Executors. Each Executor must register its own configuration about where it stores its files
  * (local dirs) and how (shuffle manager). The logic for retrieval of individual files is replicated
- * from Spark's FileShuffleBlockManager and IndexShuffleBlockManager.
+ * from Spark's FileShuffleBlockResolver and IndexShuffleBlockResolver.
  *
  * Executors with shuffle file consolidation are not currently supported, as the index is stored in
- * the Executor's memory, unlike the IndexShuffleBlockManager.
+ * the Executor's memory, unlike the IndexShuffleBlockResolver.
  */
-public class ExternalShuffleBlockManager {
-  private static final Logger logger = LoggerFactory.getLogger(ExternalShuffleBlockManager.class);
+public class ExternalShuffleBlockResolver {
+  private static final Logger logger = LoggerFactory.getLogger(ExternalShuffleBlockResolver.class);
 
   // Map containing all registered executors' metadata.
   private final ConcurrentMap<AppExecId, ExecutorShuffleInfo> executors;
@@ -60,15 +60,15 @@ public class ExternalShuffleBlockManager {
 
   private final TransportConf conf;
 
-  public ExternalShuffleBlockManager(TransportConf conf) {
+  public ExternalShuffleBlockResolver(TransportConf conf) {
     this(conf, Executors.newSingleThreadExecutor(
         // Add `spark` prefix because it will run in NM in Yarn mode.
         NettyUtils.createThreadFactory("spark-shuffle-directory-cleaner")));
   }
 
   // Allows tests to have more control over when directories are cleaned up.
   @VisibleForTesting
-  ExternalShuffleBlockManager(TransportConf conf, Executor directoryCleaner) {
+  ExternalShuffleBlockResolver(TransportConf conf, Executor directoryCleaner) {
     this.conf = conf;
     this.executors = Maps.newConcurrentMap();
     this.directoryCleaner = directoryCleaner;
@@ -168,7 +168,7 @@ private void deleteExecutorDirs(String[] dirs) {
 
   /**
    * Hash-based shuffle data is simply stored as one file per block.
-   * This logic is from FileShuffleBlockManager.
+   * This logic is from FileShuffleBlockResolver.
    */
   // TODO: Support consolidated hash shuffle files
   private ManagedBuffer getHashBasedShuffleBlockData(ExecutorShuffleInfo executor, String blockId) {
@@ -178,7 +178,7 @@ private ManagedBuffer getHashBasedShuffleBlockData(ExecutorShuffleInfo executor,
 
   /**
    * Sort-based shuffle data uses an index called "shuffle_ShuffleId_MapId_0.index" into a data file
-   * called "shuffle_ShuffleId_MapId_0.data". This logic is from IndexShuffleBlockManager,
+   * called "shuffle_ShuffleId_MapId_0.data". This logic is from IndexShuffleBlockResolver,
    * and the block id format is from ShuffleDataBlockId and ShuffleIndexBlockId.
    */
   private ManagedBuffer getSortBasedShuffleBlockData(
diff --git a/network/shuffle/src/test/java/org/apache/spark/network/shuffle/ExternalShuffleBlockHandlerSuite.java b/network/shuffle/src/test/java/org/apache/spark/network/shuffle/ExternalShuffleBlockHandlerSuite.java
@@ -45,13 +45,13 @@ public class ExternalShuffleBlockHandlerSuite {
   TransportClient client = mock(TransportClient.class);
 
   OneForOneStreamManager streamManager;
-  ExternalShuffleBlockManager blockManager;
+  ExternalShuffleBlockResolver blockManager;
   RpcHandler handler;
 
   @Before
   public void beforeEach() {
     streamManager = mock(OneForOneStreamManager.class);
-    blockManager = mock(ExternalShuffleBlockManager.class);
+    blockManager = mock(ExternalShuffleBlockResolver.class);
     handler = new ExternalShuffleBlockHandler(streamManager, blockManager);
   }
 
diff --git a/network/shuffle/src/test/java/org/apache/spark/network/shuffle/ExternalShuffleBlockResolverSuite.java b/network/shuffle/src/test/java/org/apache/spark/network/shuffle/ExternalShuffleBlockResolverSuite.java
diff --git a/network/shuffle/src/test/java/org/apache/spark/network/shuffle/ExternalShuffleCleanupSuite.java b/network/shuffle/src/test/java/org/apache/spark/network/shuffle/ExternalShuffleCleanupSuite.java
diff --git a/network/shuffle/src/test/java/org/apache/spark/network/shuffle/TestShuffleDataContext.java b/network/shuffle/src/test/java/org/apache/spark/network/shuffle/TestShuffleDataContext.java

Original file line number	Diff line number	Diff line change
`@@ -25,7 +25,7 @@ import org.apache.spark.shuffle.hash.HashShuffleReader`
`25`	`25`
`26`	`26`	`private[spark] class SortShuffleManager(conf: SparkConf) extends ShuffleManager {`
`27`	`27`
`28`		`- private val indexShuffleBlockManager = new IndexShuffleBlockManager(conf)`
	`28`	`+ private val indexShuffleBlockResolver = new IndexShuffleBlockResolver(conf)`
`29`	`29`	`private val shuffleMapNumber = new ConcurrentHashMap[Int, Int]()`
`30`	`30`
`31`	`31`	`/**`
`@@ -72,8 +72,8 @@ private[spark] class SortShuffleManager(conf: SparkConf) extends ShuffleManager`
`72`	`72`	`true`
`73`	`73`	`}`
`74`	`74`
`75`		`- override def shuffleBlockResolver: IndexShuffleBlockManager = {`
`76`		`- indexShuffleBlockManager`
	`75`	`+ override def shuffleBlockResolver: IndexShuffleBlockResolver = {`
	`76`	`+ indexShuffleBlockResolver`
`77`	`77`	`}`
`78`	`78`
`79`	`79`	`/** Shut down this ShuffleManager. */`
Original file line number	Diff line number	Diff line change
`@@ -54,7 +54,7 @@ case class RDDBlockId(rddId: Int, splitIndex: Int) extends BlockId {`
`54`	`54`	`}`
`55`	`55`
`56`	`56`	`// Format of the shuffle block ids (including data and index) should be kept in sync with`
`57`		`-// org.apache.spark.network.shuffle.StandaloneShuffleBlockManager#getBlockData().`
	`57`	`+// org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#getBlockData().`
`58`	`58`	`@DeveloperApi`
`59`	`59`	`case class ShuffleBlockId(shuffleId: Int, mapId: Int, reduceId: Int) extends BlockId {`
`60`	`60`	`override def name: String = "shuffle_" + shuffleId + "_" + mapId + "_" + reduceId`