fixed typo

Summary:
fixed typo
Closes https://github.com/facebook/rocksdb/pull/2312

Differential Revision: D5079631

Pulled By: sagar0

fbshipit-source-id: e4c8d1d89b244ee69e9dea1dd013227cc5241026

db/db_impl.h

@@ -389,7 +389,7 @@ class DBImpl : public DB {
   Status TEST_GetAllImmutableCFOptions(
       std::unordered_map<std::string, const ImmutableCFOptions*>* iopts_map);
 
-  // Return the lastest MutableCFOptions of of a column family
+  // Return the lastest MutableCFOptions of a column family
   Status TEST_GetLatestMutableCFOptions(ColumnFamilyHandle* column_family,
                                         MutableCFOptions* mutable_cf_opitons);
 

include/rocksdb/utilities/checkpoint.h

@@ -17,7 +17,7 @@ class DB;
 
 class Checkpoint {
  public:
-  // Creates a Checkpoint object to be used for creating openable sbapshots
+  // Creates a Checkpoint object to be used for creating openable snapshots
   static Status Create(DB* db, Checkpoint** checkpoint_ptr);
 
   // Builds an openable snapshot of RocksDB on the same disk, which

table/block_based_table_reader.cc

@@ -1414,7 +1414,7 @@ BlockBasedTable::BlockEntryIteratorState::NewSecondaryIterator(
     {
       ReadLock rl(&cleaner_mu);
       if (cleaner_set.find(offset) != cleaner_set.end()) {
-        // already have a refernce to the block cache objects
+        // already have a reference to the block cache objects
         return iter;
       }
     }

utilities/checkpoint/checkpoint_test.cc

@@ -219,7 +219,7 @@ class CheckpointTest : public testing::Test {
 };
 
 TEST_F(CheckpointTest, GetSnapshotLink) {
-  for (uint64_t log_size_for_fush : {0, 1000000}) {
+  for (uint64_t log_size_for_flush : {0, 1000000}) {
     Options options;
     const std::string snapshot_name = test::TmpDir(env_) + "/snapshot";
     DB* snapshotDB;
@@ -242,7 +242,7 @@ TEST_F(CheckpointTest, GetSnapshotLink) {
     ASSERT_OK(Put(key, "v1"));
     // Take a snapshot
     ASSERT_OK(Checkpoint::Create(db_, &checkpoint));
-    ASSERT_OK(checkpoint->CreateCheckpoint(snapshot_name, log_size_for_fush));
+    ASSERT_OK(checkpoint->CreateCheckpoint(snapshot_name, log_size_for_flush));
     ASSERT_OK(Put(key, "v2"));
     ASSERT_EQ("v2", Get(key));
     ASSERT_OK(Flush());