@Test
  public void testRemoveUnfinishedLeftovers_abort_multipleFolders() throws Throwable {
    ColumnFamilyStore cfs = MockSchema.newCFS(KEYSPACE);

    File origiFolder = new Directories(cfs.metadata).getDirectoryForNewSSTables();
    File dataFolder1 = new File(origiFolder, "1");
    File dataFolder2 = new File(origiFolder, "2");
    Files.createDirectories(dataFolder1.toPath());
    Files.createDirectories(dataFolder2.toPath());

    SSTableReader[] sstables = {
      sstable(dataFolder1, cfs, 0, 128),
      sstable(dataFolder1, cfs, 1, 128),
      sstable(dataFolder2, cfs, 2, 128),
      sstable(dataFolder2, cfs, 3, 128)
    };

    LogTransaction log = new LogTransaction(OperationType.COMPACTION);
    assertNotNull(log);

    LogTransaction.SSTableTidier[] tidiers = {
      log.obsoleted(sstables[0]), log.obsoleted(sstables[2])
    };

    log.trackNew(sstables[1]);
    log.trackNew(sstables[3]);

    Collection<File> logFiles = log.logFiles();
    Assert.assertEquals(2, logFiles.size());

    // fake an abort
    log.txnFile().abort();

    Arrays.stream(sstables).forEach(s -> s.selfRef().release());

    // test listing
    Assert.assertEquals(
        sstables[1].getAllFilePaths().stream().map(File::new).collect(Collectors.toSet()),
        getTemporaryFiles(dataFolder1));
    Assert.assertEquals(
        sstables[3].getAllFilePaths().stream().map(File::new).collect(Collectors.toSet()),
        getTemporaryFiles(dataFolder2));

    // normally called at startup
    LogTransaction.removeUnfinishedLeftovers(Arrays.asList(dataFolder1, dataFolder2));

    // old tables should be only table left
    assertFiles(dataFolder1.getPath(), new HashSet<>(sstables[0].getAllFilePaths()));
    assertFiles(dataFolder2.getPath(), new HashSet<>(sstables[2].getAllFilePaths()));

    // complete the transaction to avoid LEAK errors
    Arrays.stream(tidiers).forEach(LogTransaction.SSTableTidier::run);
    assertNull(log.complete(null));
  }
  private static void testObsoletedFilesChanged(Consumer<SSTableReader> modifier)
      throws IOException {
    ColumnFamilyStore cfs = MockSchema.newCFS(KEYSPACE);
    File dataFolder = new Directories(cfs.metadata).getDirectoryForNewSSTables();
    SSTableReader sstableOld = sstable(dataFolder, cfs, 0, 128);
    SSTableReader sstableNew = sstable(dataFolder, cfs, 1, 128);

    // simulate tracking sstables with a committed transaction except the checksum will be wrong
    LogTransaction log = new LogTransaction(OperationType.COMPACTION);
    assertNotNull(log);

    log.trackNew(sstableNew);
    /*TransactionLog.SSTableTidier tidier =*/ log.obsoleted(sstableOld);

    // modify the old sstable files
    modifier.accept(sstableOld);

    // Fake a commit
    log.txnFile().commit();

    // This should not remove the old files
    LogTransaction.removeUnfinishedLeftovers(cfs.metadata);

    assertFiles(
        dataFolder.getPath(),
        Sets.newHashSet(
            Iterables.concat(
                sstableNew.getAllFilePaths(), sstableOld.getAllFilePaths(), log.logFilePaths())));

    sstableOld.selfRef().release();
    sstableNew.selfRef().release();

    // complete the transaction to avoid LEAK errors
    assertNull(log.complete(null));

    assertFiles(
        dataFolder.getPath(),
        Sets.newHashSet(
            Iterables.concat(
                sstableNew.getAllFilePaths(), sstableOld.getAllFilePaths(), log.logFilePaths())));
  }
  @Test
  public void testRemoveUnfinishedLeftovers_commit() throws Throwable {
    ColumnFamilyStore cfs = MockSchema.newCFS(KEYSPACE);
    File dataFolder = new Directories(cfs.metadata).getDirectoryForNewSSTables();
    SSTableReader sstableOld = sstable(dataFolder, cfs, 0, 128);
    SSTableReader sstableNew = sstable(dataFolder, cfs, 1, 128);

    // simulate tracking sstables with a committed transaction (new log file deleted)
    LogTransaction log = new LogTransaction(OperationType.COMPACTION);
    assertNotNull(log);

    log.trackNew(sstableNew);
    LogTransaction.SSTableTidier tidier = log.obsoleted(sstableOld);

    // Fake a commit
    log.txnFile().commit();

    Set<File> tmpFiles =
        sstableOld.getAllFilePaths().stream().map(File::new).collect(Collectors.toSet());

    sstableNew.selfRef().release();
    sstableOld.selfRef().release();

    Assert.assertEquals(tmpFiles, getTemporaryFiles(sstableOld.descriptor.directory));

    // normally called at startup
    LogTransaction.removeUnfinishedLeftovers(cfs.metadata);

    // sstableNew should be only table left
    Directories directories = new Directories(cfs.metadata);
    Map<Descriptor, Set<Component>> sstables =
        directories.sstableLister(Directories.OnTxnErr.THROW).list();
    assertEquals(1, sstables.size());

    assertFiles(dataFolder.getPath(), new HashSet<>(sstableNew.getAllFilePaths()));

    // complete the transaction to avoid LEAK errors
    tidier.run();
    assertNull(log.complete(null));
  }
  private static void testRemoveUnfinishedLeftovers_multipleFolders_errorConditions(
      Consumer<LogTransaction> modifier, boolean shouldCommit) throws Throwable {
    ColumnFamilyStore cfs = MockSchema.newCFS(KEYSPACE);

    File origiFolder = new Directories(cfs.metadata).getDirectoryForNewSSTables();
    File dataFolder1 = new File(origiFolder, "1");
    File dataFolder2 = new File(origiFolder, "2");
    Files.createDirectories(dataFolder1.toPath());
    Files.createDirectories(dataFolder2.toPath());

    SSTableReader[] sstables = {
      sstable(dataFolder1, cfs, 0, 128),
      sstable(dataFolder1, cfs, 1, 128),
      sstable(dataFolder2, cfs, 2, 128),
      sstable(dataFolder2, cfs, 3, 128)
    };

    LogTransaction log = new LogTransaction(OperationType.COMPACTION);
    assertNotNull(log);

    LogTransaction.SSTableTidier[] tidiers = {
      log.obsoleted(sstables[0]), log.obsoleted(sstables[2])
    };

    log.trackNew(sstables[1]);
    log.trackNew(sstables[3]);

    // fake some error condition on the txn logs
    modifier.accept(log);

    Arrays.stream(sstables).forEach(s -> s.selfRef().release());

    LogTransaction.removeUnfinishedLeftovers(Arrays.asList(dataFolder1, dataFolder2));
    LogTransaction.waitForDeletions();

    if (shouldCommit) {
      // only new sstables should still be there
      assertFiles(dataFolder1.getPath(), new HashSet<>(sstables[1].getAllFilePaths()));
      assertFiles(dataFolder2.getPath(), new HashSet<>(sstables[3].getAllFilePaths()));
    } else {
      // all files should still be there
      assertFiles(
          dataFolder1.getPath(),
          Sets.newHashSet(
              Iterables.concat(
                  sstables[0].getAllFilePaths(),
                  sstables[1].getAllFilePaths(),
                  Collections.singleton(log.logFilePaths().get(0)))));
      assertFiles(
          dataFolder2.getPath(),
          Sets.newHashSet(
              Iterables.concat(
                  sstables[2].getAllFilePaths(),
                  sstables[3].getAllFilePaths(),
                  Collections.singleton(log.logFilePaths().get(1)))));
    }

    // complete the transaction to avoid LEAK errors
    Arrays.stream(tidiers).forEach(LogTransaction.SSTableTidier::run);
    log.txnFile().commit(); // just anything to make sure transaction tidier will finish
    assertNull(log.complete(null));
  }