Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5400#discussion_r43673151
--- Diff:
core/src/main/java/org/apache/spark/network/buffer/LargeByteBufferOutputStream.java
---
@@ -0,0 +1,91 @@
+/*
+ * 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.buffer;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.spark.util.io.ByteArrayChunkOutputStream;
+
+/**
+ * An OutputStream that will write all data to memory. It supports
writing over 2GB
+ * and the resulting data can be retrieved as a
+ * {@link org.apache.spark.network.buffer.LargeByteBuffer}
+ */
+public class LargeByteBufferOutputStream extends OutputStream {
+
+ private final ByteArrayChunkOutputStream output;
+
+ /**
+ * Create a new LargeByteBufferOutputStream which writes to byte arrays
of the given size. Note
+ * that <code>chunkSize</code> has <b>no effect</b> on the
LargeByteBuffer returned by
+ * {@link #largeBuffer()}.
+ *
+ * @param chunkSize size of the byte arrays used by this output stream,
in bytes
+ */
+ public LargeByteBufferOutputStream(int chunkSize) {
+ output = new ByteArrayChunkOutputStream(chunkSize);
+ }
+
+ @Override
+ public void write(int b) {
+ output.write(b);
+ }
+
+ @Override
+ public void write(byte[] bytes, int off, int len) {
+ output.write(bytes, off, len);
+ }
+
+ /**
+ * Get all of the data written to the stream so far as a
LargeByteBuffer. This method can be
+ * called multiple times, and each returned buffer will be completely
independent (the data
+ * is copied for each returned buffer). It does not close the stream.
+ *
+ * @return the data written to the stream as a LargeByteBuffer
+ */
+ public LargeByteBuffer largeBuffer() {
+ return largeBuffer(LargeByteBufferHelper.MAX_CHUNK_SIZE);
+ }
+
+ /**
+ * exposed for testing. You don't really ever want to call this method
-- the returned
--- End diff --
"exposed for testing." is redundant.
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