Status DBImpl::Write(const WriteOptions& options, WriteBatch* my_batch) {
  Writer w(&mutex_);
  w.batch = my_batch;
  w.sync = options.sync;
  w.done = false;

Status DBImpl::Recover(VersionEdit* edit, bool *save_manifest) {
  mutex_.AssertHeld();

  // Ignore error from CreateDir since the creation of the DB is
  // committed only when the descriptor is created, and this directory

Status DBImpl::DoCompactionWork(CompactionState* compact) {
  const uint64_t start_micros = env_->NowMicros();
  int64_t imm_micros = 0;  // Micros spent doing imm_ compactions

  Log(options_.info_log,  "Compacting %d@%d + %d@%d files",

Status DBImpl::RecoverLogFile(uint64_t log_number, bool last_log,
                              bool* save_manifest, VersionEdit* edit,
                              SequenceNumber* max_sequence) {
  struct LogReporter : public log::Reader::Reporter {
    Env* env;

void DBImpl::BackgroundCompaction() {
  mutex_.AssertHeld();

  if (imm_ != NULL) {
    CompactMemTable();