Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5430#discussion_r28178798
--- Diff:
core/src/main/scala/org/apache/spark/storage/OffHeapBlockManager.scala ---
@@ -0,0 +1,109 @@
+/*
+ * 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.storage
+
+import java.nio.ByteBuffer
+import org.apache.spark.Logging
+
+import scala.util.control.NonFatal
+
+
+trait OffHeapBlockManager {
+
+ /**
+ * desc for the implementation.
+ *
+ */
+ def desc(): String = {"OffHeap"}
+
+ /**
+ * initialize a concrete block manager implementation.
+ *
+ * @throws java.io.IOException when FS init failure.
+ */
+ def init(blockManager: BlockManager, executorId: String): Unit
+
+ /**
+ * remove the cache from offheap
+ *
+ * @throws java.io.IOException when FS failure in removing file.
+ */
+ def removeFile(blockId: BlockId): Boolean
+
+ /**
+ * check the existence of the block cache
+ *
+ * @throws java.io.IOException when FS failure in checking the block
existence.
+ */
+ def fileExists(blockId: BlockId): Boolean
+
+ /**
+ * save the cache to the offheap.
+ *
+ * @throws java.io.IOException when FS failure in put blocks.
+ */
+ def putBytes(blockId: BlockId, bytes: ByteBuffer)
+
+ /**
+ * retrieve the cache from offheap
+ *
+ * @throws java.io.IOException when FS failure in get blocks.
+ */
+ def getBytes(blockId: BlockId): Option[ByteBuffer]
+
+ /**
+ * retrieve the size of the cache
+ *
+ * @throws java.io.IOException when FS failure in get block size.
+ */
+ def getSize(blockId: BlockId): Long
+
+ /**
+ * cleanup when shutdown
+ *
+ */
+ def addShutdownHook()
+
+ final def setup(blockManager: BlockManager, executorId: String): Unit = {
+ init(blockManager, executorId)
+ addShutdownHook()
+ }
+}
+
+object OffHeapBlockManager extends Logging{
+ val MAX_DIR_CREATION_ATTEMPTS = 10
+ val SUB_DIRS_PER_DIR = "64"
+ def create(blockManager: BlockManager, executorId: String):
Option[OffHeapBlockManager] = {
--- End diff --
add a blank line before def create
we should add a default value so existing apps don't break.
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