Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/9000#discussion_r41555107
--- Diff: 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.
--- End diff --
yes, it's called in `MemoryStore#clear`
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