HDFS-1580. Committing the test case, it was missed in earlier commit.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1210749 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestGenericJournalConf.java

@@ -0,0 +1,176 @@
+/**
+ * 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.hdfs.server.namenode;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import static org.mockito.Mockito.mock;
+import static org.junit.Assert.*;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.io.Writable;
+
+import java.net.URI;
+import java.io.IOException;
+
+public class TestGenericJournalConf {
+  /** 
+   * Test that an exception is thrown if a journal class doesn't exist
+   * in the configuration 
+   */
+  @Test(expected=IllegalArgumentException.class)
+  public void testNotConfigured() throws Exception {
+    MiniDFSCluster cluster = null;
+    Configuration conf = new Configuration();
+
+    conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
+             "dummy://test");
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
+      cluster.waitActive();
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  /**
+   * Test that an exception is thrown if a journal class doesn't
+   * exist in the classloader.
+   */
+  @Test(expected=IllegalArgumentException.class)
+  public void testClassDoesntExist() throws Exception {
+    MiniDFSCluster cluster = null;
+    Configuration conf = new Configuration();
+
+    conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_PLUGIN_PREFIX + ".dummy",
+             "org.apache.hadoop.nonexistent");
+    conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
+             "dummy://test");
+
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
+      cluster.waitActive();
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  /**
+   * Test that a implementation of JournalManager without a 
+   * (Configuration,URI) constructor throws an exception
+   */
+  @Test
+  public void testBadConstructor() throws Exception {
+    MiniDFSCluster cluster = null;
+    Configuration conf = new Configuration();
+    
+    conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_PLUGIN_PREFIX + ".dummy",
+             BadConstructorJournalManager.class.getName());
+    conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
+             "dummy://test");
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
+      cluster.waitActive();
+      fail("Should have failed before this point");
+    } catch (IllegalArgumentException iae) {
+      if (!iae.getMessage().contains("Unable to construct journal")) {
+        fail("Should have failed with unable to construct exception");
+      }
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  /**
+   * Test that a dummy implementation of JournalManager can
+   * be initialized on startup
+   */
+  @Test
+  public void testDummyJournalManager() throws Exception {
+    MiniDFSCluster cluster = null;
+    Configuration conf = new Configuration();
+
+    conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_PLUGIN_PREFIX + ".dummy",
+             DummyJournalManager.class.getName());
+    conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
+             "dummy://test");
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
+      cluster.waitActive();
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  public static class DummyJournalManager implements JournalManager {
+    public DummyJournalManager(Configuration conf, URI u) {}
+    
+    @Override
+    public EditLogOutputStream startLogSegment(long txId) throws IOException {
+      return mock(EditLogOutputStream.class);
+    }
+    
+    @Override
+    public void finalizeLogSegment(long firstTxId, long lastTxId)
+        throws IOException {
+      // noop
+    }
+
+    @Override
+    public EditLogInputStream getInputStream(long fromTxnId)
+        throws IOException {
+      return null;
+    }
+
+    @Override
+    public long getNumberOfTransactions(long fromTxnId)
+        throws IOException {
+      return 0;
+    }
+
+    @Override
+    public void setOutputBufferCapacity(int size) {}
+
+    @Override
+    public void purgeLogsOlderThan(long minTxIdToKeep)
+        throws IOException {}
+
+    @Override
+    public void recoverUnfinalizedSegments() throws IOException {}
+
+    @Override
+    public void close() throws IOException {}
+  }
+
+  public static class BadConstructorJournalManager extends DummyJournalManager {
+    public BadConstructorJournalManager() {
+      super(null, null);
+    }
+  }
+}