/**
    *
    * 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.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  import java.util.HashSet;
  import java.util.Random;
  import java.util.Set;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.FileStatus;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.HColumnDescriptor;
  import org.apache.hadoop.hbase.HConstants;
  import org.apache.hadoop.hbase.HRegionInfo;
  import org.apache.hadoop.hbase.HTableDescriptor;
  import org.apache.hadoop.hbase.KeyValue;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.apache.hadoop.hbase.ServerName;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.hadoop.hbase.util.FSUtils;
  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;
  
  // imports for things that haven't moved from regionserver.wal yet.
  import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
  
  @Category(MediumTests.class)
  public class TestDefaultWALProvider {
    private static final Log LOG = LogFactory.getLog(TestDefaultWALProvider.class);
  
    protected static Configuration conf;
    protected static FileSystem fs;
    protected static FileSystem walFs;
    protected static Path walRootDir;
    protected final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
    protected MultiVersionConcurrencyControl mvcc;
  
    @Rule
    public final TestName currentTest = new TestName();
  
    @Before
    public void setUp() throws Exception {
      mvcc = new MultiVersionConcurrencyControl();
      FileStatus[] entries = fs.listStatus(new Path("/"));
      for (FileStatus dir : entries) {
        fs.delete(dir.getPath(), true);
      }
      walFs.delete(walRootDir, true);
    }
  
    @After
    public void tearDown() throws Exception {
    }
  
    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
      // Make block sizes small.
      TEST_UTIL.getConfiguration().setInt("dfs.blocksize", 1024 * 1024);
      // quicker heartbeat interval for faster DN death notification
      TEST_UTIL.getConfiguration().setInt("dfs.namenode.heartbeat.recheck-interval", 5000);
      TEST_UTIL.getConfiguration().setInt("dfs.heartbeat.interval", 1);
      TEST_UTIL.getConfiguration().setInt("dfs.client.socket-timeout", 5000);
  
      // faster failover with cluster.shutdown();fs.close() idiom
     TEST_UTIL.getConfiguration()
         .setInt("hbase.ipc.client.connect.max.retries", 1);
     TEST_UTIL.getConfiguration().setInt(
         "dfs.client.block.recovery.retries", 1);
     TEST_UTIL.getConfiguration().setInt(
       "hbase.ipc.client.connection.maxidletime", 500);
     TEST_UTIL.startMiniDFSCluster(3);
 
     // Set up a working space for our tests.
     walRootDir = TEST_UTIL.createWALRootDir();
     conf = TEST_UTIL.getConfiguration();
     fs = FSUtils.getRootDirFileSystem(conf);
     walFs = FSUtils.getWALFileSystem(conf);
   }
 
   @AfterClass
   public static void tearDownAfterClass() throws Exception {
     walFs.delete(walRootDir, true);
     TEST_UTIL.shutdownMiniCluster();
   }
 
   static String getName() {
     return "TestDefaultWALProvider";
   }
 
   @Test
   public void testGetServerNameFromWALDirectoryName() throws IOException {
     ServerName sn = ServerName.valueOf("hn", 450, 1398);
     String hl = walRootDir + "/" +
         DefaultWALProvider.getWALDirectoryName(sn.toString());
 
     // Must not throw exception
     assertNull(DefaultWALProvider.getServerNameFromWALDirectoryName(conf, null));
     assertNull(DefaultWALProvider.getServerNameFromWALDirectoryName(conf, walRootDir.toUri().toString()));
     assertNull(DefaultWALProvider.getServerNameFromWALDirectoryName(conf, ""));
     assertNull(DefaultWALProvider.getServerNameFromWALDirectoryName(conf, "                  "));
     assertNull(DefaultWALProvider.getServerNameFromWALDirectoryName(conf, hl));
     assertNull(DefaultWALProvider.getServerNameFromWALDirectoryName(conf, hl + "qdf"));
     assertNull(DefaultWALProvider.getServerNameFromWALDirectoryName(conf, "sfqf" + hl + "qdf"));
 
     final String wals = "/WALs/";
     ServerName parsed = DefaultWALProvider.getServerNameFromWALDirectoryName(conf,
       walRootDir.toUri().toString() + wals + sn +
       "/localhost%2C32984%2C1343316388997.1343316390417");
     assertEquals("standard",  sn, parsed);
 
     parsed = DefaultWALProvider.getServerNameFromWALDirectoryName(conf, hl + "/qdf");
     assertEquals("subdir", sn, parsed);
 
     parsed = DefaultWALProvider.getServerNameFromWALDirectoryName(conf,
       walRootDir.toUri().toString() + wals + sn +
       "-splitting/localhost%3A57020.1340474893931");
     assertEquals("split", sn, parsed);
   }
 
 
   protected void addEdits(WAL log, HRegionInfo hri, HTableDescriptor htd,
                         int times) throws IOException {
     final byte[] row = Bytes.toBytes("row");
     for (int i = 0; i < times; i++) {
       long timestamp = System.currentTimeMillis();
       WALEdit cols = new WALEdit();
       cols.add(new KeyValue(row, row, row, timestamp, row));
       log.append(htd, hri, getWalKey(hri.getEncodedNameAsBytes(), htd.getTableName(), timestamp),
         cols, true);
     }
     log.sync();
   }
 
   /**
    * used by TestDefaultWALProviderWithHLogKey
    */
   WALKey getWalKey(final byte[] info, final TableName tableName, final long timestamp) {
     return new WALKey(info, tableName, timestamp, mvcc);
   }
 
   /**
    * helper method to simulate region flush for a WAL.
    * @param wal
    * @param regionEncodedName
    */
   protected void flushRegion(WAL wal, byte[] regionEncodedName, Set<byte[]> flushedFamilyNames) {
     wal.startCacheFlush(regionEncodedName, flushedFamilyNames);
     wal.completeCacheFlush(regionEncodedName);
   }
 
   private static final byte[] UNSPECIFIED_REGION = new byte[]{};
 
   @Test
   public void testLogCleaning() throws Exception {
     LOG.info("testLogCleaning");
     final HTableDescriptor htd =
         new HTableDescriptor(TableName.valueOf("testLogCleaning")).addFamily(new HColumnDescriptor(
             "row"));
     final HTableDescriptor htd2 =
         new HTableDescriptor(TableName.valueOf("testLogCleaning2"))
             .addFamily(new HColumnDescriptor("row"));
     final Configuration localConf = new Configuration(conf);
     localConf.set(WALFactory.WAL_PROVIDER, DefaultWALProvider.class.getName());
     final WALFactory wals = new WALFactory(localConf, null, currentTest.getMethodName());
     try {
       HRegionInfo hri = new HRegionInfo(htd.getTableName(),
           HConstants.EMPTY_START_ROW, HConstants.EMPTY_END_ROW);
       HRegionInfo hri2 = new HRegionInfo(htd2.getTableName(),
           HConstants.EMPTY_START_ROW, HConstants.EMPTY_END_ROW);
       // we want to mix edits from regions, so pick our own identifier.
       final WAL log = wals.getWAL(UNSPECIFIED_REGION, null);
 
       // Add a single edit and make sure that rolling won't remove the file
       // Before HBASE-3198 it used to delete it
       addEdits(log, hri, htd, 1);
       log.rollWriter();
       assertEquals(1, DefaultWALProvider.getNumRolledLogFiles(log));
 
       // See if there's anything wrong with more than 1 edit
       addEdits(log, hri, htd, 2);
       log.rollWriter();
       assertEquals(2, DefaultWALProvider.getNumRolledLogFiles(log));
 
       // Now mix edits from 2 regions, still no flushing
       addEdits(log, hri, htd, 1);
       addEdits(log, hri2, htd2, 1);
       addEdits(log, hri, htd, 1);
       addEdits(log, hri2, htd2, 1);
       log.rollWriter();
       assertEquals(3, DefaultWALProvider.getNumRolledLogFiles(log));
 
       // Flush the first region, we expect to see the first two files getting
       // archived. We need to append something or writer won't be rolled.
       addEdits(log, hri2, htd2, 1);
       log.startCacheFlush(hri.getEncodedNameAsBytes(), htd.getFamiliesKeys());
       log.completeCacheFlush(hri.getEncodedNameAsBytes());
       log.rollWriter();
       assertEquals(2, DefaultWALProvider.getNumRolledLogFiles(log));
 
       // Flush the second region, which removes all the remaining output files
       // since the oldest was completely flushed and the two others only contain
       // flush information
       addEdits(log, hri2, htd2, 1);
       log.startCacheFlush(hri2.getEncodedNameAsBytes(), htd2.getFamiliesKeys());
       log.completeCacheFlush(hri2.getEncodedNameAsBytes());
       log.rollWriter();
       assertEquals(0, DefaultWALProvider.getNumRolledLogFiles(log));
     } finally {
       if (wals != null) {
         wals.close();
       }
     }
   }
 
   /**
    * Tests wal archiving by adding data, doing flushing/rolling and checking we archive old logs
    * and also don't archive "live logs" (that is, a log with un-flushed entries).
    * <p>
    * This is what it does:
    * It creates two regions, and does a series of inserts along with log rolling.
    * Whenever a WAL is rolled, HLogBase checks previous wals for archiving. A wal is eligible for
    * archiving if for all the regions which have entries in that wal file, have flushed - past
    * their maximum sequence id in that wal file.
    * <p>
    * @throws IOException
    */
   @Test
   public void testWALArchiving() throws IOException {
     LOG.debug("testWALArchiving");
     HTableDescriptor table1 =
         new HTableDescriptor(TableName.valueOf("t1")).addFamily(new HColumnDescriptor("row"));
     HTableDescriptor table2 =
         new HTableDescriptor(TableName.valueOf("t2")).addFamily(new HColumnDescriptor("row"));
     final Configuration localConf = new Configuration(conf);
     localConf.set(WALFactory.WAL_PROVIDER, DefaultWALProvider.class.getName());
     final WALFactory wals = new WALFactory(localConf, null, currentTest.getMethodName());
     try {
       final WAL wal = wals.getWAL(UNSPECIFIED_REGION, null);
       assertEquals(0, DefaultWALProvider.getNumRolledLogFiles(wal));
       HRegionInfo hri1 =
           new HRegionInfo(table1.getTableName(), HConstants.EMPTY_START_ROW,
               HConstants.EMPTY_END_ROW);
       HRegionInfo hri2 =
           new HRegionInfo(table2.getTableName(), HConstants.EMPTY_START_ROW,
               HConstants.EMPTY_END_ROW);
       // ensure that we don't split the regions.
       hri1.setSplit(false);
       hri2.setSplit(false);
       // variables to mock region sequenceIds.
       // start with the testing logic: insert a waledit, and roll writer
       addEdits(wal, hri1, table1, 1);
       wal.rollWriter();
       // assert that the wal is rolled
       assertEquals(1, DefaultWALProvider.getNumRolledLogFiles(wal));
       // add edits in the second wal file, and roll writer.
       addEdits(wal, hri1, table1, 1);
       wal.rollWriter();
       // assert that the wal is rolled
       assertEquals(2, DefaultWALProvider.getNumRolledLogFiles(wal));
       // add a waledit to table1, and flush the region.
       addEdits(wal, hri1, table1, 3);
       flushRegion(wal, hri1.getEncodedNameAsBytes(), table1.getFamiliesKeys());
       // roll log; all old logs should be archived.
       wal.rollWriter();
       assertEquals(0, DefaultWALProvider.getNumRolledLogFiles(wal));
       // add an edit to table2, and roll writer
       addEdits(wal, hri2, table2, 1);
       wal.rollWriter();
       assertEquals(1, DefaultWALProvider.getNumRolledLogFiles(wal));
       // add edits for table1, and roll writer
       addEdits(wal, hri1, table1, 2);
       wal.rollWriter();
       assertEquals(2, DefaultWALProvider.getNumRolledLogFiles(wal));
       // add edits for table2, and flush hri1.
       addEdits(wal, hri2, table2, 2);
       flushRegion(wal, hri1.getEncodedNameAsBytes(), table2.getFamiliesKeys());
       // the log : region-sequenceId map is
       // log1: region2 (unflushed)
       // log2: region1 (flushed)
       // log3: region2 (unflushed)
       // roll the writer; log2 should be archived.
       wal.rollWriter();
       assertEquals(2, DefaultWALProvider.getNumRolledLogFiles(wal));
       // flush region2, and all logs should be archived.
       addEdits(wal, hri2, table2, 2);
       flushRegion(wal, hri2.getEncodedNameAsBytes(), table2.getFamiliesKeys());
       wal.rollWriter();
       assertEquals(0, DefaultWALProvider.getNumRolledLogFiles(wal));
     } finally {
       if (wals != null) {
         wals.close();
       }
     }
   }
 
   /**
    * Write to a log file with three concurrent threads and verifying all data is written.
    * @throws Exception
    */
   @Test
   public void testConcurrentWrites() throws Exception {
     // Run the WPE tool with three threads writing 3000 edits each concurrently.
     // When done, verify that all edits were written.
     int errCode = WALPerformanceEvaluation.
       innerMain(new Configuration(TEST_UTIL.getConfiguration()),
         new String [] {"-threads", "3", "-verify", "-noclosefs", "-iterations", "3000"});
     assertEquals(0, errCode);
   }
 
   /**
    * Ensure that we can use Set.add to deduplicate WALs
    */
   @Test
   public void setMembershipDedups() throws IOException {
     final Configuration localConf = new Configuration(conf);
     localConf.set(WALFactory.WAL_PROVIDER, DefaultWALProvider.class.getName());
     final WALFactory wals = new WALFactory(localConf, null, currentTest.getMethodName());
     try {
       final Set<WAL> seen = new HashSet<WAL>(1);
       final Random random = new Random();
       assertTrue("first attempt to add WAL from default provider should work.",
           seen.add(wals.getWAL(Bytes.toBytes(random.nextInt()), null)));
       for (int i = 0; i < 1000; i++) {
         assertFalse("default wal provider is only supposed to return a single wal, which should "
             + "compare as .equals itself.",
           seen.add(wals.getWAL(Bytes.toBytes(random.nextInt()), null)));
       }
     } finally {
       wals.close();
     }
   }
 }