HDDS-654. Add ServiceLoader resource for OzoneFileSystem. Contributed by Jitendra Nath Pandey.

hadoop-ozone/ozonefs/src/main/resources/META-INF/services/org.apache.hadoop.fs.FileSystem

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+# 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.
+
+org.apache.hadoop.fs.ozone.OzoneFileSystem

hadoop-ozone/ozonefs/src/test/java/org/apache/hadoop/fs/ozone/TestOzoneFileSystem.java

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+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.ozone;
+
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.ozone.OzoneConsts;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.IOException;
+
+/**
+ * Ozone file system tests that are not covered by contract tests.
+ */
+public class TestOzoneFileSystem {
+
+  @Test
+  public void testOzoneFsServiceLoader() throws IOException {
+    Assert.assertEquals(
+        FileSystem.getFileSystemClass(OzoneConsts.OZONE_URI_SCHEME, null),
+        OzoneFileSystem.class);
+  }
+}