[SPARK-10956] Common MemoryManager interface for storage and execution

core/src/main/scala/org/apache/spark/MemoryManager.scala

@@ -0,0 +1,100 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark
+
+import scala.collection.mutable
+
+import org.apache.spark.storage.{BlockId, BlockStatus}
+
+
+/**
+ * An abstract memory manager that enforces how memory is shared between execution and storage.
+ *
+ * In this context, execution memory refers to that used for computation in shuffles, joins,
+ * sorts and aggregations, while storage memory refers to that used for caching and propagating
+ * internal data across the cluster.
+ */
+private[spark] abstract class MemoryManager {
+
+  /**
+   * Acquire N bytes of memory for execution.
+   * @return number of bytes successfully granted (<= N).
+   */
+  def acquireExecutionMemory(numBytes: Long): Long
+
+  /**
+   * Acquire N bytes of memory to cache the given block, evicting existing ones if necessary.
+   * Blocks evicted in the process, if any, are added to `evictedBlocks`.
+   * @return number of bytes successfully granted (0 or N).
+   */
+  def acquireStorageMemory(
+      blockId: BlockId,
+      numBytes: Long,
+      evictedBlocks: mutable.Buffer[(BlockId, BlockStatus)]): Long
+
+  /**
+   * Acquire N bytes of memory to unroll the given block, evicting existing ones if necessary.
+   * Blocks evicted in the process, if any, are added to `evictedBlocks`.
+   * @return number of bytes successfully granted (<= N).
+   */
+  def acquireUnrollMemory(
+      blockId: BlockId,
+      numBytes: Long,
+      evictedBlocks: mutable.Buffer[(BlockId, BlockStatus)]): Long
+
+  /**
+   * Release N bytes of execution memory.
+   */
+  def releaseExecutionMemory(numBytes: Long): Unit
+
+  /**
+   * Release N bytes of storage memory.
+   */
+  def releaseStorageMemory(numBytes: Long): Unit
+
+  /**
+   * Release all storage memory acquired.
+   */
+  def releaseStorageMemory(): Unit
+
+  /**
+   * Release N bytes of unroll memory.
+   */
+  def releaseUnrollMemory(numBytes: Long): Unit
+
+  /**
+   * Total available memory for execution, in bytes.
+   */
+  def maxExecutionMemory: Long
+
+  /**
+   * Total available memory for storage, in bytes.
+   */
+  def maxStorageMemory: Long
+
+  /**
+   * Execution memory currently in use, in bytes.
+   */
+  def executionMemoryUsed: Long
+
+  /**
+   * Storage memory currently in use, in bytes.
+   */
+  def storageMemoryUsed: Long
+
+}

core/src/main/scala/org/apache/spark/SparkEnv.scala

@@ -69,6 +69,8 @@ class SparkEnv (
     val httpFileServer: HttpFileServer,
     val sparkFilesDir: String,
     val metricsSystem: MetricsSystem,
+    // TODO: unify these *MemoryManager classes
+    val memoryManager: MemoryManager,
     val shuffleMemoryManager: ShuffleMemoryManager,
     val executorMemoryManager: ExecutorMemoryManager,
     val outputCommitCoordinator: OutputCommitCoordinator,
@@ -323,7 +325,8 @@ object SparkEnv extends Logging {
     val shuffleMgrClass = shortShuffleMgrNames.getOrElse(shuffleMgrName.toLowerCase, shuffleMgrName)
     val shuffleManager = instantiateClass[ShuffleManager](shuffleMgrClass)
 
-    val shuffleMemoryManager = ShuffleMemoryManager.create(conf, numUsableCores)
+    val memoryManager = new StaticMemoryManager(conf)
+    val shuffleMemoryManager = ShuffleMemoryManager.create(conf, memoryManager, numUsableCores)
 
     val blockTransferService = new NettyBlockTransferService(conf, securityManager, numUsableCores)
 
@@ -334,8 +337,8 @@ object SparkEnv extends Logging {
 
     // NB: blockManager is not valid until initialize() is called later.
     val blockManager = new BlockManager(executorId, rpcEnv, blockManagerMaster,
-      serializer, conf, mapOutputTracker, shuffleManager, blockTransferService, securityManager,
-      numUsableCores)
+      serializer, conf, memoryManager, mapOutputTracker, shuffleManager,
+      blockTransferService, securityManager, numUsableCores)
 
     val broadcastManager = new BroadcastManager(isDriver, conf, securityManager)
 
@@ -407,6 +410,7 @@ object SparkEnv extends Logging {
       httpFileServer,
       sparkFilesDir,
       metricsSystem,
+      memoryManager,
       shuffleMemoryManager,
       executorMemoryManager,
       outputCommitCoordinator,

core/src/main/scala/org/apache/spark/StaticMemoryManager.scala

@@ -0,0 +1,229 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark
+
+import scala.collection.mutable
+
+import org.apache.spark.storage.{BlockId, BlockStatus, MemoryStore}
+
+
+/**
+ * A [[MemoryManager]] that statically partitions the heap space into disjoint regions.
+ *
+ * The sizes of the execution and storage regions are determined through
+ * `spark.shuffle.memoryFraction` and `spark.storage.memoryFraction` respectively. The two
+ * regions are cleanly separated such that neither usage can borrow memory from the other.
+ */
+private[spark] class StaticMemoryManager(
+    conf: SparkConf,
+    override val maxExecutionMemory: Long,
+    override val maxStorageMemory: Long)
+  extends MemoryManager with Logging {
+
+  // Max number of bytes worth of blocks to evict when unrolling
+  private val maxMemoryToEvictForUnroll: Long = {
+    (maxStorageMemory * conf.getDouble("spark.storage.unrollFraction", 0.2)).toLong
+  }
+
+  // Amount of execution memory in use. Accesses must be synchronized on `executionLock`.
+  private var _executionMemoryUsed: Long = 0
+  private val executionLock = new Object
+
+  // Amount of storage memory in use. Accesses must be synchronized on `storageLock`.
+  private var _storageMemoryUsed: Long = 0
+  private val storageLock = new Object
+
+  // The memory store used to evict cached blocks
+  private var _memoryStore: MemoryStore = _
+  private def memoryStore: MemoryStore = {
+    if (_memoryStore == null) {
+      _memoryStore = SparkEnv.get.blockManager.memoryStore
+    }
+    _memoryStore
+  }
+
+  // For testing only
+  def setMemoryStore(store: MemoryStore): Unit = {
+    _memoryStore = store
+  }
+
+  def this(conf: SparkConf) {
+    this(
+      conf,
+      StaticMemoryManager.getMaxExecutionMemory(conf),
+      StaticMemoryManager.getMaxStorageMemory(conf))
+  }
+
+  /**
+   * Acquire N bytes of memory for execution.
+   * @return number of bytes successfully granted (<= N).
+   */
+  override def acquireExecutionMemory(numBytes: Long): Long = {
+    executionLock.synchronized {
+      assert(_executionMemoryUsed <= maxExecutionMemory)
+      val bytesToGrant = math.min(numBytes, maxExecutionMemory - _executionMemoryUsed)
+      _executionMemoryUsed += bytesToGrant
+      bytesToGrant
+    }
+  }
+
+  /**
+   * Acquire N bytes of memory to cache the given block, evicting existing ones if necessary.
+   * Blocks evicted in the process, if any, are added to `evictedBlocks`.
+   * @return number of bytes successfully granted (0 or N).
+   */
+  override def acquireStorageMemory(
+      blockId: BlockId,
+      numBytes: Long,
+      evictedBlocks: mutable.Buffer[(BlockId, BlockStatus)]): Long = {
+    acquireStorageMemory(blockId, numBytes, numBytes, evictedBlocks)
+  }
+
+  /**
+   * Acquire N bytes of memory to unroll the given block, evicting existing ones if necessary.
+   *
+   * This evicts at most M bytes worth of existing blocks, where M is a fraction of the storage
+   * space specified by `spark.storage.unrollFraction`. Blocks evicted in the process, if any,
+   * are added to `evictedBlocks`.
+   *
+   * @return number of bytes successfully granted (0 or N).
+   */
+  override def acquireUnrollMemory(
+      blockId: BlockId,
+      numBytes: Long,
+      evictedBlocks: mutable.Buffer[(BlockId, BlockStatus)]): Long = {
+    val currentUnrollMemory = memoryStore.currentUnrollMemory
+    val maxNumBytesToFree = math.max(0, maxMemoryToEvictForUnroll - currentUnrollMemory)
+    val numBytesToFree = math.min(numBytes, maxNumBytesToFree)
+    acquireStorageMemory(blockId, numBytes, numBytesToFree, evictedBlocks)
+  }
+
+  /**
+   * Acquire N bytes of storage memory for the given block, evicting existing ones if necessary.
+   *
+   * @param blockId the ID of the block we are acquiring storage memory for
+   * @param numBytesToAcquire the size of this block
+   * @param numBytesToFree the size of space to be freed through evicting blocks
+   * @param evictedBlocks a holder for blocks evicted in the process
+   * @return number of bytes successfully granted (0 or N).
+   */
+  private def acquireStorageMemory(
+      blockId: BlockId,
+      numBytesToAcquire: Long,
+      numBytesToFree: Long,
+      evictedBlocks: mutable.Buffer[(BlockId, BlockStatus)]): Long = {
+    // Note: Keep this outside synchronized block to avoid potential deadlocks!
+    memoryStore.ensureFreeSpace(blockId, numBytesToFree, evictedBlocks)
+    storageLock.synchronized {
+      assert(_storageMemoryUsed <= maxStorageMemory)
+      val enoughMemory = _storageMemoryUsed + numBytesToAcquire <= maxStorageMemory
+      val bytesToGrant = if (enoughMemory) numBytesToAcquire else 0
+      _storageMemoryUsed += bytesToGrant
+      bytesToGrant
+    }
+  }
+
+  /**
+   * Release N bytes of execution memory.
+   */
+  override def releaseExecutionMemory(numBytes: Long): Unit = {
+    executionLock.synchronized {
+      if (numBytes > _executionMemoryUsed) {
+        logWarning(s"Attempted to release $numBytes bytes of execution " +
+          s"memory when we only have ${_executionMemoryUsed} bytes")
+        _executionMemoryUsed = 0
+      } else {
+        _executionMemoryUsed -= numBytes
+      }
+    }
+  }
+
+  /**
+   * Release N bytes of storage memory.
+   */
+  override def releaseStorageMemory(numBytes: Long): Unit = {
+    storageLock.synchronized {
+      if (numBytes > _storageMemoryUsed) {
+        logWarning(s"Attempted to release $numBytes bytes of storage " +
+          s"memory when we only have ${_storageMemoryUsed} bytes")
+        _storageMemoryUsed = 0
+      } else {
+        _storageMemoryUsed -= numBytes
+      }
+    }
+  }
+
+  /**
+   * Release all storage memory acquired.
+   */
+  override def releaseStorageMemory(): Unit = {
+    storageLock.synchronized {
+      _storageMemoryUsed = 0
+    }
+  }
+
+  /**
+   * Release N bytes of unroll memory.
+   */
+  override def releaseUnrollMemory(numBytes: Long): Unit = {
+    releaseStorageMemory(numBytes)
+  }
+
+  /**
+   * Amount of execution memory currently in use, in bytes.
+   */
+  override def executionMemoryUsed: Long = {
+    executionLock.synchronized {
+      _executionMemoryUsed
+    }
+  }
+
+  /**
+   * Amount of storage memory currently in use, in bytes.
+   */
+  override def storageMemoryUsed: Long = {
+    storageLock.synchronized {
+      _storageMemoryUsed
+    }
+  }
+
+}
+
+
+private[spark] object StaticMemoryManager {
+
+  /**
+   * Return the total amount of memory available for the storage region, in bytes.
+   */
+  private def getMaxStorageMemory(conf: SparkConf): Long = {
+    val memoryFraction = conf.getDouble("spark.storage.memoryFraction", 0.6)
+    val safetyFraction = conf.getDouble("spark.storage.safetyFraction", 0.9)
+    (Runtime.getRuntime.maxMemory * memoryFraction * safetyFraction).toLong
+  }
+
+
+  /**
+   * Return the total amount of memory available for the execution region, in bytes.
+   */
+  private def getMaxExecutionMemory(conf: SparkConf): Long = {
+    val memoryFraction = conf.getDouble("spark.shuffle.memoryFraction", 0.2)
+    val safetyFraction = conf.getDouble("spark.shuffle.safetyFraction", 0.8)
+    (Runtime.getRuntime.maxMemory * memoryFraction * safetyFraction).toLong
+  }
+
+}