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+/**
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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * or more contributor license agreements. See the NOTICE file
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+ * distributed with this work for additional information
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+ * regarding copyright ownership. The ASF licenses this file
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+ * to you under the Apache License, Version 2.0 (the
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+ * "License"); you may not use this file except in compliance
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+ * with the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+package org.apache.hadoop.hdfs.server.namenode.ha;
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+
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+import static org.junit.Assert.*;
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+
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+import java.io.File;
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+import java.util.concurrent.TimeoutException;
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+
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+import org.apache.hadoop.conf.Configuration;
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+import org.apache.hadoop.fs.FileSystem;
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+import org.apache.hadoop.fs.Path;
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+import org.apache.hadoop.ha.NodeFencer;
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+import org.apache.hadoop.ha.ZKFailoverController;
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+import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
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+import org.apache.hadoop.ha.TestNodeFencer.AlwaysSucceedFencer;
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+import org.apache.hadoop.hdfs.MiniDFSCluster;
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+import org.apache.hadoop.hdfs.MiniDFSNNTopology;
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+import org.apache.hadoop.hdfs.server.namenode.NameNode;
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+import org.apache.hadoop.hdfs.tools.DFSZKFailoverController;
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+import org.apache.hadoop.test.GenericTestUtils;
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+import org.apache.hadoop.test.MultithreadedTestUtil.TestContext;
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+import org.apache.hadoop.test.MultithreadedTestUtil.TestingThread;
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+import org.apache.zookeeper.test.ClientBase;
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+import org.junit.After;
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+import org.junit.Before;
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+import org.junit.Test;
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+
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+
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+import com.google.common.base.Supplier;
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+
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+public class TestDFSZKFailoverController extends ClientBase {
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+ private Configuration conf;
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+ private MiniDFSCluster cluster;
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+ private TestContext ctx;
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+ private ZKFCThread thr1, thr2;
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+ private FileSystem fs;
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+
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+ @Override
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+ public void setUp() throws Exception {
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+ // build.test.dir is used by zookeeper
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+ new File(System.getProperty("build.test.dir", "build")).mkdirs();
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+ super.setUp();
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+ }
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+
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+ @Before
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+ public void setup() throws Exception {
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+ conf = new Configuration();
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+ conf.set(ZKFailoverController.ZK_QUORUM_KEY, hostPort);
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+ conf.set(NodeFencer.CONF_METHODS_KEY,
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+ AlwaysSucceedFencer.class.getName());
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+
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+ MiniDFSNNTopology topology = new MiniDFSNNTopology()
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+ .addNameservice(new MiniDFSNNTopology.NSConf("ns1")
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+ .addNN(new MiniDFSNNTopology.NNConf("nn1").setIpcPort(10001))
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+ .addNN(new MiniDFSNNTopology.NNConf("nn2").setIpcPort(10002)));
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+ cluster = new MiniDFSCluster.Builder(conf)
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+ .nnTopology(topology)
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+ .numDataNodes(0)
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+ .build();
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+ cluster.waitActive();
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+
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+ ctx = new TestContext();
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+ ctx.addThread(thr1 = new ZKFCThread(ctx, 0));
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+ assertEquals(0, thr1.zkfc.run(new String[]{"-formatZK"}));
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+
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+ thr1.start();
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+ waitForHAState(0, HAServiceState.ACTIVE);
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+
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+ ctx.addThread(thr2 = new ZKFCThread(ctx, 1));
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+ thr2.start();
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+
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+ fs = HATestUtil.configureFailoverFs(cluster, conf);
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+ }
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+
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+ @After
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+ public void shutdown() throws Exception {
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+ cluster.shutdown();
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+
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+ if (thr1 != null) {
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+ thr1.interrupt();
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+ }
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+ if (thr2 != null) {
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+ thr2.interrupt();
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+ }
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+ if (ctx != null) {
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+ ctx.stop();
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+ }
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+ }
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+
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+ /**
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+ * Test that automatic failover is triggered by shutting the
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+ * active NN down.
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+ */
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+ @Test(timeout=30000)
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+ public void testFailoverAndBackOnNNShutdown() throws Exception {
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+ Path p1 = new Path("/dir1");
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+ Path p2 = new Path("/dir2");
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+
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+ // Write some data on the first NN
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+ fs.mkdirs(p1);
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+ // Shut it down, causing automatic failover
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+ cluster.shutdownNameNode(0);
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+ // Data should still exist. Write some on the new NN
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+ assertTrue(fs.exists(p1));
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+ fs.mkdirs(p2);
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+ assertEquals(AlwaysSucceedFencer.getLastFencedService().getAddress(),
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+ thr1.zkfc.getLocalTarget().getAddress());
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+
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+ // Start the first node back up
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+ cluster.restartNameNode(0);
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+ // This should have no effect -- the new node should be STANDBY.
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+ waitForHAState(0, HAServiceState.STANDBY);
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+ assertTrue(fs.exists(p1));
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+ assertTrue(fs.exists(p2));
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+ // Shut down the second node, which should failback to the first
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+ cluster.shutdownNameNode(1);
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+ waitForHAState(0, HAServiceState.ACTIVE);
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+
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+ // First node should see what was written on the second node while it was down.
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+ assertTrue(fs.exists(p1));
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+ assertTrue(fs.exists(p2));
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+ assertEquals(AlwaysSucceedFencer.getLastFencedService().getAddress(),
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+ thr2.zkfc.getLocalTarget().getAddress());
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+ }
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+
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+ private void waitForHAState(int nnidx, final HAServiceState state)
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+ throws TimeoutException, InterruptedException {
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+ final NameNode nn = cluster.getNameNode(nnidx);
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+ GenericTestUtils.waitFor(new Supplier<Boolean>() {
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+ @Override
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+ public Boolean get() {
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+ try {
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+ return nn.getRpcServer().getServiceStatus().getState() == state;
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+ } catch (Exception e) {
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+ e.printStackTrace();
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+ return false;
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+ }
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+ }
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+ }, 50, 5000);
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+ }
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+
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+ /**
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+ * Test-thread which runs a ZK Failover Controller corresponding
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+ * to a given NameNode in the minicluster.
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+ */
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+ private class ZKFCThread extends TestingThread {
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+ private final DFSZKFailoverController zkfc;
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+
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+ public ZKFCThread(TestContext ctx, int idx) {
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+ super(ctx);
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+ this.zkfc = new DFSZKFailoverController();
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+ zkfc.setConf(cluster.getConfiguration(idx));
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+ }
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+
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+ @Override
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+ public void doWork() throws Exception {
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+ try {
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+ assertEquals(0, zkfc.run(new String[0]));
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+ } catch (InterruptedException ie) {
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+ // Interrupted by main thread, that's OK.
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+ }
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+ }
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+ }
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+
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+}
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Todd Lipcon