fixed typo

Summary:
I fixed exisit -> exist
Closes https://github.com/facebook/rocksdb/pull/1799

Differential Revision: D4451466

Pulled By: yiwu-arbug

fbshipit-source-id: b447c3a

db/db_sst_test.cc

@@ -613,7 +613,7 @@ TEST_F(DBSSTTest, OpenDBWithInfiniteMaxOpenFiles) {
     }
     Close();
 
-    // Reopening the DB will load all exisitng files
+    // Reopening the DB will load all existing files
     Reopen(options);
     ASSERT_EQ("12,0,12", FilesPerLevel(0));
     std::vector<std::vector<FileMetaData>> files;

db/external_sst_file_test.cc

@@ -258,11 +258,11 @@ TEST_F(ExternalSSTFileTest, Basic) {
       ASSERT_EQ(Get(Key(k)), Key(k) + "_val");
     }
 
-    // This file has overlapping values with the exisitng data
+    // This file has overlapping values with the existing data
     s = DeprecatedAddFile({file3});
     ASSERT_FALSE(s.ok()) << s.ToString();
 
-    // This file has overlapping values with the exisitng data
+    // This file has overlapping values with the existing data
     s = DeprecatedAddFile({file4});
     ASSERT_FALSE(s.ok()) << s.ToString();
 
@@ -510,7 +510,7 @@ TEST_F(ExternalSSTFileTest, AddList) {
       ASSERT_EQ(user_props["xyz_Count"], "100");
     }
 
-    // This file list has overlapping values with the exisitng data
+    // This file list has overlapping values with the existing data
     s = DeprecatedAddFile(file_list3);
     ASSERT_FALSE(s.ok()) << s.ToString();
 
@@ -705,7 +705,7 @@ TEST_F(ExternalSSTFileTest, NoCopy) {
   ASSERT_TRUE(s.ok()) << s.ToString();
   ASSERT_OK(env_->FileExists(file2));
 
-  // This file have overlapping values with the exisitng data
+  // This file have overlapping values with the existing data
   s = DeprecatedAddFile({file2}, true /* move file */);
   ASSERT_FALSE(s.ok()) << s.ToString();
   ASSERT_OK(env_->FileExists(file3));

include/rocksdb/options.h

@@ -1508,7 +1508,7 @@ struct ReadOptions {
   // used in the table. Some table format (e.g. plain table) may not support
   // this option.
   // If true when calling Get(), we also skip prefix bloom when reading from
-  // block based table. It provides a way to read exisiting data after
+  // block based table. It provides a way to read existing data after
   // changing implementation of prefix extractor.
   bool total_order_seek;
 

include/rocksdb/sst_file_manager.h

@@ -68,13 +68,13 @@ class SstFileManager {
 //    this value is set to 1024 (1 Kb / sec) and we deleted a file of size 4 Kb
 //    in 1 second, we will wait for another 3 seconds before we delete other
 //    files, Set to 0 to disable deletion rate limiting.
-// @param delete_exisitng_trash: If set to true, the newly created
+// @param delete_existing_trash: If set to true, the newly created
 //    SstFileManager will delete files that already exist in trash_dir.
 // @param status: If not nullptr, status will contain any errors that happened
 //    during creating the missing trash_dir or deleting existing files in trash.
 extern SstFileManager* NewSstFileManager(
     Env* env, std::shared_ptr<Logger> info_log = nullptr,
     std::string trash_dir = "", int64_t rate_bytes_per_sec = 0,
-    bool delete_exisitng_trash = true, Status* status = nullptr);
+    bool delete_existing_trash = true, Status* status = nullptr);
 
 }  // namespace rocksdb

util/sst_file_manager_impl.cc

@@ -122,14 +122,14 @@ void SstFileManagerImpl::OnDeleteFileImpl(const std::string& file_path) {
 SstFileManager* NewSstFileManager(Env* env, std::shared_ptr<Logger> info_log,
                                   std::string trash_dir,
                                   int64_t rate_bytes_per_sec,
-                                  bool delete_exisitng_trash, Status* status) {
+                                  bool delete_existing_trash, Status* status) {
   SstFileManagerImpl* res =
       new SstFileManagerImpl(env, info_log, trash_dir, rate_bytes_per_sec);
 
   Status s;
   if (trash_dir != "" && rate_bytes_per_sec > 0) {
     s = env->CreateDirIfMissing(trash_dir);
-    if (s.ok() && delete_exisitng_trash) {
+    if (s.ok() && delete_existing_trash) {
       std::vector<std::string> files_in_trash;
       s = env->GetChildren(trash_dir, &files_in_trash);
       if (s.ok()) {
@@ -161,7 +161,7 @@ SstFileManager* NewSstFileManager(Env* env, std::shared_ptr<Logger> info_log,
 SstFileManager* NewSstFileManager(Env* env, std::shared_ptr<Logger> info_log,
                                   std::string trash_dir,
                                   int64_t rate_bytes_per_sec,
-                                  bool delete_exisitng_trash, Status* status) {
+                                  bool delete_existing_trash, Status* status) {
   if (status) {
     *status =
         Status::NotSupported("SstFileManager is not supported in ROCKSDB_LITE");

utilities/persistent_cache/block_cache_tier.cc

@@ -45,7 +45,7 @@ Status BlockCacheTier::Open() {
   // Create base/<cache dir> directory
   status = opt_.env->CreateDir(GetCachePath());
   if (!status.ok()) {
-    // directory already exisits, clean it up
+    // directory already exists, clean it up
     status = CleanupCacheFolder(GetCachePath());
     assert(status.ok());
     if (!status.ok()) {
@@ -226,7 +226,7 @@ Status BlockCacheTier::InsertImpl(const Slice& key, const Slice& data) {
 
   LBA lba;
   if (metadata_.Lookup(key, &lba)) {
-    // the key already exisits, this is duplicate insert
+    // the key already exists, this is duplicate insert
     return Status::OK();
   }