Remove unused variables (#10327)

Summary:
As title.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10327

Test Plan: make check

Reviewed By: gitbw95

Differential Revision: D37699040

Pulled By: riversand963

fbshipit-source-id: 305a88628907a47dea53c4d9aec9c2f5bb9b58df

db/db_impl/db_impl.cc

@@ -246,8 +246,6 @@ DBImpl::DBImpl(const DBOptions& options, const std::string& dbname,
   // !batch_per_trx_ implies seq_per_batch_ because it is only unset for
   // WriteUnprepared, which should use seq_per_batch_.
   assert(batch_per_txn_ || seq_per_batch_);
-  // TODO: Check for an error here
-  env_->GetAbsolutePath(dbname, &db_absolute_path_).PermitUncheckedError();
 
   // Reserve ten files or so for other uses and give the rest to TableCache.
   // Give a large number for setting of "infinite" open files.

db/db_impl/db_impl.h

@@ -1999,7 +1999,6 @@ class DBImpl : public DB {
   void MemTableInsertStatusCheck(const Status& memtable_insert_status);
 
 #ifndef ROCKSDB_LITE
-
   Status CompactFilesImpl(const CompactionOptions& compact_options,
                           ColumnFamilyData* cfd, Version* version,
                           const std::vector<std::string>& input_file_names,
@@ -2011,7 +2010,6 @@ class DBImpl : public DB {
   // Wait for current IngestExternalFile() calls to finish.
   // REQUIRES: mutex_ held
   void WaitForIngestFile();
-
 #else
   // IngestExternalFile is not supported in ROCKSDB_LITE so this function
   // will be no-op
@@ -2498,12 +2496,6 @@ class DBImpl : public DB {
   // log is fully commited.
   bool unable_to_release_oldest_log_;
 
-  static const int KEEP_LOG_FILE_NUM = 1000;
-  // MSVC version 1800 still does not have constexpr for ::max()
-  static const uint64_t kNoTimeOut = std::numeric_limits<uint64_t>::max();
-
-  std::string db_absolute_path_;
-
   // Number of running IngestExternalFile() or CreateColumnFamilyWithImport()
   // calls.
   // REQUIRES: mutex held