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  package org.apache.cassandra.db.compaction.writers;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Random;
  import java.util.Set;
  
  import com.google.common.primitives.Longs;
  import org.junit.After;
  import org.junit.AfterClass;
  import org.junit.BeforeClass;
  import org.junit.Ignore;
  import org.junit.Test;
  
  import org.apache.cassandra.ServerTestUtils;
  import org.apache.cassandra.Util;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.config.ParameterizedClass;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.cql3.QueryProcessor;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.Directories;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.compaction.AbstractCompactionStrategy;
  import org.apache.cassandra.db.compaction.CompactionController;
  import org.apache.cassandra.db.compaction.CompactionIterator;
  import org.apache.cassandra.db.compaction.OperationType;
  import org.apache.cassandra.db.lifecycle.LifecycleTransaction;
  import org.apache.cassandra.io.sstable.format.SSTableReader;
  import org.apache.cassandra.io.util.File;
  import org.apache.cassandra.schema.MockSchema;
  import org.apache.cassandra.utils.FBUtilities;
  
  import static org.apache.cassandra.db.compaction.OperationType.COMPACTION;
  import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUID;
  import static org.junit.Assert.assertEquals;
  
  public class CompactionAwareWriterTest extends CQLTester
  {
      private static final String KEYSPACE = "cawt_keyspace";
      private static final String TABLE = "cawt_table";
  
      private static final int ROW_PER_PARTITION = 10;
  
      @BeforeClass
      public static void setUpClass()
      {
          DatabaseDescriptor.daemonInitialization();
          // we assert that we create a single sstable in populate(..) below - always use STCS
          DatabaseDescriptor.getRawConfig().default_compaction = new ParameterizedClass("SizeTieredCompactionStrategy", new HashMap<>());
          // Don't register/join the local node so that DiskBoundaries are empty (testMultiDatadirCheck depends on this)
          ServerTestUtils.prepareServerNoRegister();
          // Disabling durable write since we don't care
          schemaChange("CREATE KEYSPACE IF NOT EXISTS " + KEYSPACE + " WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '1'} AND durable_writes=false");
          schemaChange(String.format("CREATE TABLE %s.%s (k int, t int, v blob, PRIMARY KEY (k, t)) WITH compaction = {'class': 'SizeTieredCompactionStrategy'}", KEYSPACE, TABLE));
          // The compaction specification above is to avoid failures caused by UCS splitting large files.
          ServerTestUtils.markCMS();
      }
  
      @AfterClass
      public static void tearDownClass()
      {
          QueryProcessor.executeInternal("DROP KEYSPACE IF EXISTS " + KEYSPACE);
      }
  
      private ColumnFamilyStore getColumnFamilyStore()
      {
          return Keyspace.open(KEYSPACE).getColumnFamilyStore(TABLE);
      }
  
      @After
      public void afterTest() {
          Keyspace ks = Keyspace.open(KEYSPACE);
          ColumnFamilyStore cfs = ks.getColumnFamilyStore(TABLE);
          cfs.truncateBlocking();
      }
  
      @Test
      public void testDefaultCompactionWriter() throws Throwable
      {
          Keyspace ks = Keyspace.open(KEYSPACE);
          ColumnFamilyStore cfs = ks.getColumnFamilyStore(TABLE);
  
          int rowCount = 1000;
          cfs.disableAutoCompaction();
          populate(rowCount);
          LifecycleTransaction txn = cfs.getTracker().tryModify(cfs.getLiveSSTables(), OperationType.COMPACTION);
          long beforeSize = txn.originals().iterator().next().onDiskLength();
          CompactionAwareWriter writer = new DefaultCompactionWriter(cfs, cfs.getDirectories(), txn, txn.originals());
          int rows = compact(cfs, txn, writer);
          assertEquals(1, cfs.getLiveSSTables().size());
          assertEquals(rowCount, rows);
          assertEquals(beforeSize, cfs.getLiveSSTables().iterator().next().onDiskLength());
          validateData(cfs, rowCount);
          cfs.truncateBlocking();
      }
  
      @Test
      public void testMaxSSTableSizeWriter() throws Throwable
      {
          ColumnFamilyStore cfs = getColumnFamilyStore();
          cfs.disableAutoCompaction();
          int rowCount = 1000;
          populate(rowCount);
          LifecycleTransaction txn = cfs.getTracker().tryModify(cfs.getLiveSSTables(), OperationType.COMPACTION);
          long beforeSize = txn.originals().iterator().next().onDiskLength();
          int sstableSize = (int)beforeSize/10;
          CompactionAwareWriter writer = new MaxSSTableSizeWriter(cfs, cfs.getDirectories(), txn, txn.originals(), sstableSize, 0);
          int rows = compact(cfs, txn, writer);
          assertEquals(10, cfs.getLiveSSTables().size());
          assertEquals(rowCount, rows);
          validateData(cfs, rowCount);
          cfs.truncateBlocking();
      }
  
      @Test
      public void testSplittingSizeTieredCompactionWriter() throws Throwable
      {
          ColumnFamilyStore cfs = getColumnFamilyStore();
          cfs.disableAutoCompaction();
          int rowCount = 10000;
          populate(rowCount);
          LifecycleTransaction txn = cfs.getTracker().tryModify(cfs.getLiveSSTables(), OperationType.COMPACTION);
          long beforeSize = txn.originals().iterator().next().onDiskLength();
          CompactionAwareWriter writer = new SplittingSizeTieredCompactionWriter(cfs, cfs.getDirectories(), txn, txn.originals(), 0);
          int rows = compact(cfs, txn, writer);
          long expectedSize = beforeSize / 2;
          List<SSTableReader> sortedSSTables = new ArrayList<>(cfs.getLiveSSTables());
  
          Collections.sort(sortedSSTables, new Comparator<SSTableReader>()
                                  {
                                      @Override
                                      public int compare(SSTableReader o1, SSTableReader o2)
                                      {
                                          return Longs.compare(o2.onDiskLength(), o1.onDiskLength());
                                      }
                                  });
          for (SSTableReader sstable : sortedSSTables)
          {
              // we dont create smaller files than this, everything will be in the last file
              if (expectedSize > SplittingSizeTieredCompactionWriter.DEFAULT_SMALLEST_SSTABLE_BYTES)
                  assertEquals(expectedSize, sstable.onDiskLength(), expectedSize / 100); // allow 1% diff in estimated vs actual size
              expectedSize /= 2;
          }
          assertEquals(rowCount, rows);
          validateData(cfs, rowCount);
          cfs.truncateBlocking();
      }
  
      @Ignore
      @Test
      public void testMajorLeveledCompactionWriter() throws Throwable
      {
          ColumnFamilyStore cfs = getColumnFamilyStore();
          cfs.disableAutoCompaction();
          int rowCount = 20000;
          int targetSSTableCount = 50;
          populate(rowCount);
          LifecycleTransaction txn = cfs.getTracker().tryModify(cfs.getLiveSSTables(), OperationType.COMPACTION);
          long beforeSize = txn.originals().iterator().next().onDiskLength();
          int sstableSize = (int)beforeSize/targetSSTableCount;
          CompactionAwareWriter writer = new MajorLeveledCompactionWriter(cfs, cfs.getDirectories(), txn, txn.originals(), sstableSize);
          int rows = compact(cfs, txn, writer);
          assertEquals(targetSSTableCount, cfs.getLiveSSTables().size());
          int [] levelCounts = new int[5];
          assertEquals(rowCount, rows);
          for (SSTableReader sstable : cfs.getLiveSSTables())
          {
              levelCounts[sstable.getSSTableLevel()]++;
          }
          assertEquals(0, levelCounts[0]);
          assertEquals(10, levelCounts[1]);
          assertEquals(targetSSTableCount - 10, levelCounts[2]); // note that if we want more levels, fix this
          for (int i = 3; i < levelCounts.length; i++)
              assertEquals(0, levelCounts[i]);
          validateData(cfs, rowCount);
          cfs.truncateBlocking();
      }
  
      @Test
      public void testMultiDatadirCheck() throws IOException
      {
          createTable("create table %s (id int primary key)");
          Path tmpDir = Files.createTempDirectory("testMultiDatadirCheck");
  
          Directories.DataDirectory [] dataDirs = new Directories.DataDirectory[] {
          new MockDataDirectory(new File(tmpDir, "1")),
          new MockDataDirectory(new File(tmpDir, "2")),
          new MockDataDirectory(new File(tmpDir, "3")),
          new MockDataDirectory(new File(tmpDir, "4")),
          new MockDataDirectory(new File(tmpDir, "5"))
          };
          Set<SSTableReader> sstables = new HashSet<>();
          for (int i = 0; i < 100; i++)
              sstables.add(MockSchema.sstable(i, 1000, getCurrentColumnFamilyStore()));
  
          Directories dirs = new Directories(getCurrentColumnFamilyStore().metadata(), dataDirs);
          LifecycleTransaction txn = LifecycleTransaction.offline(OperationType.COMPACTION, sstables);
          CompactionAwareWriter writer = new MaxSSTableSizeWriter(getCurrentColumnFamilyStore(), dirs, txn, sstables, 2000, 1);
          // init case
          writer.maybeSwitchWriter(null);
      }
  
      private static class MockDataDirectory extends Directories.DataDirectory
      {
          public MockDataDirectory(File location)
          {
              super(location);
          }
  
          public long getAvailableSpace()
          {
              return 5000;
          }
      }
  
      private int compact(ColumnFamilyStore cfs, LifecycleTransaction txn, CompactionAwareWriter writer)
      {
          assert txn.originals().size() == 1;
          int rowsWritten = 0;
          long nowInSec = FBUtilities.nowInSeconds();
          try (AbstractCompactionStrategy.ScannerList scanners = cfs.getCompactionStrategyManager().getScanners(txn.originals());
               CompactionController controller = new CompactionController(cfs, txn.originals(), cfs.gcBefore(nowInSec));
               CompactionIterator ci = new CompactionIterator(COMPACTION, scanners.scanners, controller, nowInSec, nextTimeUUID()))
          {
              while (ci.hasNext())
              {
                  if (writer.append(ci.next()))
                      rowsWritten++;
              }
          }
          writer.finish();
          return rowsWritten;
      }
  
      private void populate(int count) throws Throwable
      {
          byte [] payload = new byte[5000];
          new Random(42).nextBytes(payload);
          ByteBuffer b = ByteBuffer.wrap(payload);
  
          for (int i = 0; i < count; i++)
              for (int j = 0; j < ROW_PER_PARTITION; j++)
                  execute(String.format("INSERT INTO %s.%s(k, t, v) VALUES (?, ?, ?)", KEYSPACE, TABLE), i, j, b);
  
          ColumnFamilyStore cfs = getColumnFamilyStore();
          Util.flush(cfs);
          if (cfs.getLiveSSTables().size() > 1)
          {
              // we want just one big sstable to avoid doing actual compaction in compact() above
              try
              {
                  cfs.forceMajorCompaction();
              }
              catch (Throwable t)
              {
                  throw new RuntimeException(t);
              }
          }
          assert cfs.getLiveSSTables().size() == 1 : cfs.getLiveSSTables();
      }
  
      private void validateData(ColumnFamilyStore cfs, int rowCount) throws Throwable
      {
          for (int i = 0; i < rowCount; i++)
          {
              Object[][] expected = new Object[ROW_PER_PARTITION][];
              for (int j = 0; j < ROW_PER_PARTITION; j++)
                  expected[j] = row(i, j);
  
              assertRows(execute(String.format("SELECT k, t FROM %s.%s WHERE k = :i", KEYSPACE, TABLE), i), expected);
          }
      }
  }
  