Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/9344#discussion_r43827121
--- Diff:
core/src/main/scala/org/apache/spark/memory/StorageMemoryPool.scala ---
@@ -0,0 +1,138 @@
+/*
+ * 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.memory
+
+import javax.annotation.concurrent.GuardedBy
+
+import scala.collection.mutable
+import scala.collection.mutable.ArrayBuffer
+
+import org.apache.spark.{TaskContext, Logging}
+import org.apache.spark.storage.{MemoryStore, BlockStatus, BlockId}
+
+/**
+ * Performs bookkeeping for managing an adjustable-size pool of memory
that is used for storage
+ * (caching).
+ *
+ * @param memoryManager a [[MemoryManager]] instance to synchronize on
+ */
+class StorageMemoryPool(memoryManager: Object) extends
MemoryPool(memoryManager) with Logging {
+
+ @GuardedBy("memoryManager")
+ private[this] var _memoryUsed: Long = 0L
+
+ override def memoryUsed: Long = memoryManager.synchronized {
+ _memoryUsed
+ }
+
+ private var _memoryStore: MemoryStore = _
+ def memoryStore: MemoryStore = {
+ if (_memoryStore == null) {
+ throw new IllegalArgumentException("memory store not initialized
yet")
--- End diff --
illegal state?
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