/**
    * 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.wal;
  
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.fail;
  
  import java.io.IOException;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.client.Get;
  import org.apache.hadoop.hbase.client.Put;
  import org.apache.hadoop.hbase.client.Result;
  import org.apache.hadoop.hbase.client.Table;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.apache.hadoop.hbase.testclassification.RegionServerTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.junit.After;
  import org.junit.AfterClass;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.rules.TestName;
  
  @Category({ RegionServerTests.class, MediumTests.class })
  public class TestDisabledWAL {
  
    @Rule
    public TestName name = new TestName();
  
    private static final Log LOG = LogFactory.getLog(TestDisabledWAL.class);
    static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
    private Table table;
    private TableName tableName;
    private byte[] fam = Bytes.toBytes("f1");
  
    @BeforeClass
    public static void beforeClass() throws Exception {
      Configuration conf = TEST_UTIL.getConfiguration();
      conf.setBoolean("hbase.regionserver.hlog.enabled", false);
      try {
        TEST_UTIL.startMiniCluster();
      } catch (RuntimeException | IOException e) {
        LOG.error("Master failed to start.", e);
        fail("Failed to start cluster. Reason being: " + e.getCause().getMessage());
      }
    }
  
    @AfterClass
    public static void afterClass() throws Exception {
      TEST_UTIL.shutdownMiniCluster();
    }
  
    @Before
    public void setup() throws Exception {
      tableName = TableName.valueOf(name.getMethodName().replaceAll("[^a-zA-Z0-9]", "_"));
      LOG.info("Creating table " + tableName);
      table = TEST_UTIL.createTable(tableName, fam);
    }
  
    @After
    public void cleanup() throws Exception {
      LOG.info("Deleting table " + tableName);
      TEST_UTIL.deleteTable(tableName);
    }
  
    @Test
    public void testDisabledWAL() throws Exception {
      LOG.info("Writing data to table " + tableName);
      Put p = new Put(Bytes.toBytes("row"));
      p.addColumn(fam, Bytes.toBytes("qual"), Bytes.toBytes("val"));
      table.put(p);
  
      LOG.info("Flushing table " + tableName);
      TEST_UTIL.flush(tableName);
  
      LOG.info("Getting data from table " + tableName);
      Get get = new Get(Bytes.toBytes("row"));
  
     Result result = table.get(get);
     assertNotNull(result.getValue(fam, Bytes.toBytes("qual")));
   }
 }