Fix typos in comments (#4456)

Summary:
Fix some typos in the comments
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4456

Differential Revision: D10209214

Pulled By: miasantreble

fbshipit-source-id: dff857ba60396bc95126e635db96d7dc8330d2cb

build_tools/gnu_parallel

@@ -5082,8 +5082,8 @@ sub openoutputfiles {
 	# Set reading FD if using --group (--ungroup does not need)
 	for my $fdno (1,2) {
 	    # Re-open the file for reading
-	    # so fdw can be closed seperately
-	    # and fdr can be seeked seperately (for --line-buffer)
+	    # so fdw can be closed separately
+	    # and fdr can be seeked separately (for --line-buffer)
 	    open(my $fdr,"<", $self->fh($fdno,'name')) ||
 		::die_bug("fdr: Cannot open ".$self->fh($fdno,'name'));
 	    $self->set_fh($fdno,'r',$fdr);

db/error_handler.cc

@@ -157,7 +157,7 @@ void ErrorHandler::CancelErrorRecovery() {
 //    a default one is allocated during DB::Open(), so there will always be
 //    one.
 // This can also get called as part of a recovery operation. In that case, we
-// also track the error seperately in recovery_error_ so we can tell in the
+// also track the error separately in recovery_error_ so we can tell in the
 // end whether recovery succeeded or not
 Status ErrorHandler::SetBGError(const Status& bg_err, BackgroundErrorReason reason) {
   db_mutex_->AssertHeld();

db/error_handler.h

@@ -60,7 +60,7 @@ class ErrorHandler {
     DBImpl* db_;
     const ImmutableDBOptions& db_options_;
     Status bg_error_;
-    // A seperate Status variable used to record any errors during the
+    // A separate Status variable used to record any errors during the
     // recovery process from hard errors
     Status recovery_error_;
     InstrumentedMutex* db_mutex_;

db/external_sst_file_ingestion_job.cc

@@ -225,7 +225,7 @@ void ExternalSstFileIngestionJob::UpdateStats() {
   for (IngestedFileInfo& f : files_to_ingest_) {
     InternalStats::CompactionStats stats(CompactionReason::kExternalSstIngestion, 1);
     stats.micros = total_time;
-    // If actual copy occured for this file, then we need to count the file
+    // If actual copy occurred for this file, then we need to count the file
     // size as the actual bytes written. If the file was linked, then we ignore
     // the bytes written for file metadata.
     // TODO (yanqin) maybe account for file metadata bytes for exact accuracy?

port/win/io_win.h

@@ -58,7 +58,7 @@ class WinFileData {
  protected:
   const std::string filename_;
   HANDLE hFile_;
-  // If ture,  the I/O issued would be direct I/O which the buffer
+  // If true, the I/O issued would be direct I/O which the buffer
   // will need to be aligned (not sure there is a guarantee that the buffer
   // passed in is aligned).
   const bool use_direct_io_;

table/block.h

@@ -170,7 +170,7 @@ class Block {
   //
   // key_includes_seq, default true, means that the keys are in internal key
   // format.
-  // value_is_full, default ture, means that no delta encoding is
+  // value_is_full, default true, means that no delta encoding is
   // applied to values.
   //
   // NewIterator<DataBlockIter>
@@ -449,7 +449,7 @@ class IndexBlockIter final : public BlockIter<BlockHandle> {
   }
   // key_includes_seq, default true, means that the keys are in internal key
   // format.
-  // value_is_full, default ture, means that no delta encoding is
+  // value_is_full, default true, means that no delta encoding is
   // applied to values.
   IndexBlockIter(const Comparator* comparator,
                  const Comparator* user_comparator, const char* data,