HADOOP-14091. AbstractFileSystem implementaion for 'wasbs' scheme. Contributed Varada Hemeswari.

(cherry picked from commit 82607fce39151fc6ba5bced738088e2bc176dc77)

hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/Wasbs.java

@@ -0,0 +1,47 @@
+/**
+ * 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.azure;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.DelegateToFileSystem;
+
+/**
+ * WASB implementation of AbstractFileSystem for wasbs scheme.
+ * This impl delegates to the old FileSystem
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public class Wasbs extends DelegateToFileSystem {
+
+  Wasbs(final URI theUri, final Configuration conf) throws IOException,
+      URISyntaxException {
+    super(theUri, new NativeAzureFileSystem(), conf, "wasbs", false);
+  }
+
+  @Override
+  public int getUriDefaultPort() {
+    return -1;
+  }
+}

hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azure/TestWasbUriAndConfiguration.java

@@ -44,6 +44,7 @@ import org.apache.hadoop.fs.AbstractFileSystem;
 import org.apache.hadoop.fs.FileContext;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.UnsupportedFileSystemException;
 import org.apache.hadoop.fs.azure.AzureBlobStorageTestAccount.CreateOptions;
 import org.junit.After;
 import org.junit.Assert;
@@ -471,6 +472,62 @@ public class TestWasbUriAndConfiguration {
       assertTrue(afs instanceof Wasb);
       assertEquals(-1, afs.getUri().getPort());
     } finally {
+      testAccount.cleanup();
+      FileSystem.closeAll();
+    }
+  }
+
+   /**
+   * Tests the cases when the scheme specified is 'wasbs'.
+   */
+  @Test
+  public void testAbstractFileSystemImplementationForWasbsScheme() throws Exception {
+    try {
+      testAccount = AzureBlobStorageTestAccount.createMock();
+      Configuration conf = testAccount.getFileSystem().getConf();
+      String authority = testAccount.getFileSystem().getUri().getAuthority();
+      URI defaultUri = new URI("wasbs", authority, null, null, null);
+      conf.set(FS_DEFAULT_NAME_KEY, defaultUri.toString());
+      conf.set("fs.AbstractFileSystem.wasbs.impl", "org.apache.hadoop.fs.azure.Wasbs");
+      conf.addResource("azure-test.xml");
+
+      FileSystem fs = FileSystem.get(conf);
+      assertTrue(fs instanceof NativeAzureFileSystem);
+      assertEquals("wasbs", fs.getScheme());
+
+      AbstractFileSystem afs = FileContext.getFileContext(conf)
+          .getDefaultFileSystem();
+      assertTrue(afs instanceof Wasbs);
+      assertEquals(-1, afs.getUri().getPort());
+      assertEquals("wasbs", afs.getUri().getScheme());
+    } finally {
+      testAccount.cleanup();
+      FileSystem.closeAll();
+    }
+  }
+
+  @Test
+  public void testNoAbstractFileSystemImplementationSpecifiedForWasbsScheme() throws Exception {
+    try {
+      testAccount = AzureBlobStorageTestAccount.createMock();
+      Configuration conf = testAccount.getFileSystem().getConf();
+      String authority = testAccount.getFileSystem().getUri().getAuthority();
+      URI defaultUri = new URI("wasbs", authority, null, null, null);
+      conf.set(FS_DEFAULT_NAME_KEY, defaultUri.toString());
+
+      FileSystem fs = FileSystem.get(conf);
+      assertTrue(fs instanceof NativeAzureFileSystem);
+      assertEquals("wasbs", fs.getScheme());
+
+      // should throw if 'fs.AbstractFileSystem.wasbs.impl'' is not specified
+      try{
+        FileContext.getFileContext(conf).getDefaultFileSystem();
+        fail("Should've thrown.");
+      }catch(UnsupportedFileSystemException e){
+      }
+
+    } finally {
+      testAccount.cleanup();
       FileSystem.closeAll();
     }
   }