Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22404#discussion_r217153478
--- Diff:
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/SimpleDownloadFile.java
---
@@ -0,0 +1,89 @@
+/*
+ * 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 org.apache.spark.network.buffer.FileSegmentManagedBuffer;
+import org.apache.spark.network.buffer.ManagedBuffer;
+import org.apache.spark.network.util.TransportConf;
+
+import java.io.*;
+import java.nio.ByteBuffer;
+import java.nio.channels.Channels;
+import java.nio.channels.WritableByteChannel;
+
+/**
+ * A DownloadFile that does not take any encryption settings into account
for reading and
+ * writing data.
+ *
+ * This does *not* mean the data in the file is un-encrypted -- it could
be that the data is
+ * already encrypted when its written, and subsequent layer is responsible
for decrypting.
+ */
+public class SimpleDownloadFile implements DownloadFile {
+ private final File file;
+ private final TransportConf transportConf;
+
+ public SimpleDownloadFile(File file, TransportConf transportConf) {
+ this.file = file;
+ this.transportConf = transportConf;
+ }
+
+ @Override
+ public boolean delete() {
+ return file.delete();
+ }
+
+ @Override
+ public DownloadFileWritableChannel openForWriting() {
+ try {
+ return new SimpleDownloadWritableChannel();
+ } catch (FileNotFoundException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ @Override
+ public String path() {
+ return file.getAbsolutePath();
+ }
+
+ private class SimpleDownloadWritableChannel implements
DownloadFileWritableChannel {
+ private final WritableByteChannel channel;
--- End diff --
More nits, would put blank lines around this
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