Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3001#discussion_r19648132
--- Diff:
network/shuffle/src/main/java/org/apache/spark/network/shuffle/StandaloneShuffleBlockManager.java
---
@@ -0,0 +1,151 @@
+/*
+ * 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.network.shuffle;
+
+import java.io.DataInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.spark.network.buffer.FileSegmentManagedBuffer;
+import org.apache.spark.network.buffer.ManagedBuffer;
+import org.apache.spark.network.util.JavaUtils;
+
+/**
+ * Manages converting shuffle BlockIds into physical segments of local
files. 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.
+ *
+ * Executors with shuffle file consolidation are not currently supported,
as the index is stored in
+ * the Executor's memory, unlike the IndexShuffleBlockManager.
+ */
+public class StandaloneShuffleBlockManager {
--- End diff --
(Actually we might be able to just use this class altogether in Yarn, but I
still need to verify this)
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