[GitHub] [hadoop] steveloughran commented on a change in pull request #1679: HDFS-13934. Multipart uploaders to be created through FileSystem/FileContext.

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steveloughran commented on a change in pull request #1679: HDFS-13934. Multipart uploaders to be created through FileSystem/FileContext.
URL: https://github.com/apache/hadoop/pull/1679#discussion_r388848460
 
 

 ##########
 File path: hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/impl/S3AMultipartUploader.java
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 @@ -0,0 +1,323 @@
+/*
+ * 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.hadoop.fs.s3a.impl;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+
+import com.amazonaws.services.s3.model.CompleteMultipartUploadResult;
+import com.amazonaws.services.s3.model.PartETag;
+import com.amazonaws.services.s3.model.UploadPartRequest;
+import com.amazonaws.services.s3.model.UploadPartResult;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Charsets;
+import com.google.common.base.Preconditions;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.tuple.Triple;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.BBPartHandle;
+import org.apache.hadoop.fs.BBUploadHandle;
+import org.apache.hadoop.fs.PartHandle;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.PathHandle;
+import org.apache.hadoop.fs.UploadHandle;
+import org.apache.hadoop.fs.impl.AbstractMultipartUploader;
+import org.apache.hadoop.fs.s3a.WriteOperations;
+import org.apache.hadoop.fs.s3a.impl.statistics.S3AMultipartUploaderStatistics;
+import org.apache.hadoop.fs.s3a.s3guard.BulkOperationState;
+
+/**
+ * MultipartUploader for S3AFileSystem. This uses the S3 multipart
+ * upload mechanism.
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
+class S3AMultipartUploader extends AbstractMultipartUploader {
+
+  private final S3AMultipartUploaderBuilder builder;
+
+  /** Header for serialized Parts: {@value}. */
+
+  public static final String HEADER = "S3A-part01";
 
 Review comment:
   no reason, just wanted something I could serialize and this is version 01 of the header

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