TestClusterId.java example

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hbase-master
/*
 * Copyright The Apache Software Foundation
 *
 * 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.hbase.regionserver;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import java.util.UUID;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.CoordinatedStateManager;
import org.apache.hadoop.hbase.CoordinatedStateManagerFactory;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.testclassification.RegionServerTests;
import org.apache.hadoop.hbase.master.HMaster;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hbase.util.JVMClusterUtil;
import org.apache.hadoop.hbase.zookeeper.ZKClusterId;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;


/**
 * Test metrics incremented on region server operations.
 */
@Category({RegionServerTests.class, MediumTests.class})
public class TestClusterId {

  private final HBaseTestingUtility TEST_UTIL =
      new HBaseTestingUtility();

  private JVMClusterUtil.RegionServerThread rst;

  @Before
  public void setUp() throws Exception {
    TEST_UTIL.getConfiguration().setBoolean(ShutdownHook.RUN_SHUTDOWN_HOOK, false);
  }

  @After
  public void tearDown() throws Exception {
    TEST_UTIL.shutdownMiniCluster();
    if(rst != null && rst.getRegionServer() != null) {
      rst.getRegionServer().stop("end of test");
      rst.join();
    }
  }

  @Test
  public void testClusterId() throws Exception  {
    TEST_UTIL.startMiniZKCluster();
    TEST_UTIL.startMiniDFSCluster(1);

    Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
    CoordinatedStateManager cp = CoordinatedStateManagerFactory.getCoordinatedStateManager(conf);
    //start region server, needs to be separate
    //so we get an unset clusterId
    rst = JVMClusterUtil.createRegionServerThread(conf,cp,
        HRegionServer.class, 0);
    rst.start();
    //Make sure RS is in blocking state
    Thread.sleep(10000);

    TEST_UTIL.startMiniHBaseCluster(1, 0);

    rst.waitForServerOnline();

    String clusterId = ZKClusterId.readClusterIdZNode(TEST_UTIL.getZooKeeperWatcher());
    assertNotNull(clusterId);
    assertEquals(clusterId, rst.getRegionServer().getClusterId());
  }
  
  @Test
  public void testRewritingClusterIdToPB() throws Exception {
    TEST_UTIL.startMiniZKCluster();
    TEST_UTIL.startMiniDFSCluster(1);
    TEST_UTIL.createRootDir();
    Path rootDir = FSUtils.getRootDir(TEST_UTIL.getConfiguration());
    FileSystem fs = rootDir.getFileSystem(TEST_UTIL.getConfiguration());
    Path filePath = new Path(rootDir, HConstants.CLUSTER_ID_FILE_NAME);
    FSDataOutputStream s = null;
    try {
      s = fs.create(filePath);
      s.writeUTF(UUID.randomUUID().toString());
    } finally {
      if (s != null) {
        s.close();
      }
    }
    TEST_UTIL.startMiniHBaseCluster(1, 1);
    HMaster master = TEST_UTIL.getHBaseCluster().getMaster();
    assertEquals(2, master.getServerManager().getOnlineServersList().size());
  }
  
}