hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestClusterRestart.java

/**
 * 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.master;

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

import java.util.List;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.MetaTableAccessor;
import org.apache.hadoop.hbase.TableExistsException;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.testclassification.MasterTests;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Category({ MasterTests.class, MediumTests.class })
public class TestClusterRestart extends AbstractTestRestartCluster {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
    HBaseClassTestRule.forClass(TestClusterRestart.class);

  private static final Logger LOG = LoggerFactory.getLogger(TestClusterRestart.class);

  private static final int NUM_REGIONS = 3;

  @Override
  protected boolean splitWALCoordinatedByZk() {
    return true;
  }

  @Test
  public void test() throws Exception {
    UTIL.startMiniCluster(3);
    UTIL.waitFor(60000, () -> UTIL.getMiniHBaseCluster().getMaster().isInitialized());
    LOG.info("\n\nCreating tables");
    for (TableName TABLE : TABLES) {
      UTIL.createTable(TABLE, FAMILY);
    }
    for (TableName TABLE : TABLES) {
      UTIL.waitTableEnabled(TABLE);
    }

    List<RegionInfo> allRegions = MetaTableAccessor.getAllRegions(UTIL.getConnection(), false);
    assertEquals(NUM_REGIONS, allRegions.size());

    LOG.info("\n\nShutting down cluster");
    UTIL.shutdownMiniHBaseCluster();

    LOG.info("\n\nSleeping a bit");
    Thread.sleep(2000);

    LOG.info("\n\nStarting cluster the second time");
    UTIL.restartHBaseCluster(3);

    // Need to use a new 'Configuration' so we make a new Connection.
    // Otherwise we're reusing an Connection that has gone stale because
    // the shutdown of the cluster also called shut of the connection.
    allRegions = MetaTableAccessor.getAllRegions(UTIL.getConnection(), false);
    assertEquals(NUM_REGIONS, allRegions.size());
    LOG.info("\n\nWaiting for tables to be available");
    for (TableName TABLE : TABLES) {
      try {
        UTIL.createTable(TABLE, FAMILY);
        assertTrue("Able to create table that should already exist", false);
      } catch (TableExistsException tee) {
        LOG.info("Table already exists as expected");
      }
      UTIL.waitTableAvailable(TABLE);
    }
  }
}