steveloughran commented on a change in pull request #2971:
URL: https://github.com/apache/hadoop/pull/2971#discussion_r819746192



##########
File path: 
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/commit/AbfsManifestStoreOperations.java
##########
@@ -0,0 +1,125 @@
+/*
+ * 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.azurebfs.commit;
+
+import java.io.IOException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.PathIOException;
+import org.apache.hadoop.fs.azurebfs.AzureBlobFileSystem;
+import 
org.apache.hadoop.mapreduce.lib.output.committer.manifest.files.FileOrDirEntry;
+import 
org.apache.hadoop.mapreduce.lib.output.committer.manifest.impl.StoreOperationsThroughFileSystem;
+
+/**
+ * Extension of StoreOperationsThroughFileSystem with ABFS awareness.
+ * Purely for use by jobs committing work through the manifest committer.
+ * its classname MUST NOT be changed otherwise these jobs will fail.
+ *
+ * ADLS Gen2 stores support etag-recovery on renames, but not WASB
+ * stores.
+ */
[email protected]("mapreduce")
[email protected]
+public class AbfsManifestStoreOperations extends 
StoreOperationsThroughFileSystem {

Review comment:
       we need it here so we can keep the bits of the new api in the abfs FS 
class out of reach




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