Add support for BlobDB to ldb (#9630)

Summary:
Add the configuration options and help messages of BlobDB to `ldb`

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9630

Test Plan: `python ./tools/ldb_test.py`

Reviewed By: ltamasi

Differential Revision: D34443176

Pulled By: changneng

fbshipit-source-id: 5b3f185cdfc2561e06dd37215c7edfbca07dbe80

HISTORY.md

@@ -2,6 +2,7 @@
 ## Unreleased
 ### New Features
 * Allow WriteBatchWithIndex to index a WriteBatch that includes keys with user-defined timestamps. The index itself does not have timestamp.
+* Added BlobDB options to `ldb`
 
 ### Bug Fixes
 * * Fixed a data race on `versions_` between `DBImpl::ResumeImpl()` and threads waiting for recovery to complete (#9496)

include/rocksdb/utilities/ldb_cmd.h

@@ -61,6 +61,14 @@ class LDBCommand {
   static const std::string ARG_CREATE_IF_MISSING;
   static const std::string ARG_NO_VALUE;
   static const std::string ARG_DISABLE_CONSISTENCY_CHECKS;
+  static const std::string ARG_ENABLE_BLOB_FILES;
+  static const std::string ARG_MIN_BLOB_SIZE;
+  static const std::string ARG_BLOB_FILE_SIZE;
+  static const std::string ARG_BLOB_COMPRESSION_TYPE;
+  static const std::string ARG_ENABLE_BLOB_GARBAGE_COLLECTION;
+  static const std::string ARG_BLOB_GARBAGE_COLLECTION_AGE_CUTOFF;
+  static const std::string ARG_BLOB_GARBAGE_COLLECTION_FORCE_THRESHOLD;
+  static const std::string ARG_BLOB_COMPACTION_READAHEAD_SIZE;
 
   struct ParsedParams {
     std::string cmd;
@@ -173,6 +181,10 @@ class LDBCommand {
   // The value passed to options.force_consistency_checks.
   bool force_consistency_checks_;
 
+  bool enable_blob_files_;
+
+  bool enable_blob_garbage_collection_;
+
   bool create_if_missing_;
 
   /**
@@ -233,9 +245,18 @@ class LDBCommand {
                       const std::string& option, int& value,
                       LDBCommandExecuteResult& exec_state);
 
+  bool ParseDoubleOption(const std::map<std::string, std::string>& options,
+                         const std::string& option, double& value,
+                         LDBCommandExecuteResult& exec_state);
+
   bool ParseStringOption(const std::map<std::string, std::string>& options,
                          const std::string& option, std::string* value);
 
+  bool ParseCompressionTypeOption(
+      const std::map<std::string, std::string>& options,
+      const std::string& option, CompressionType& value,
+      LDBCommandExecuteResult& exec_state);
+
   /**
    * Returns the value of the specified option as a boolean.
    * default_val is used if the option is not found in options.

tools/ldb_cmd.cc

@@ -82,6 +82,19 @@ const std::string LDBCommand::ARG_WRITE_BUFFER_SIZE = "write_buffer_size";
 const std::string LDBCommand::ARG_FILE_SIZE = "file_size";
 const std::string LDBCommand::ARG_CREATE_IF_MISSING = "create_if_missing";
 const std::string LDBCommand::ARG_NO_VALUE = "no_value";
+const std::string LDBCommand::ARG_ENABLE_BLOB_FILES = "enable_blob_files";
+const std::string LDBCommand::ARG_MIN_BLOB_SIZE = "min_blob_size";
+const std::string LDBCommand::ARG_BLOB_FILE_SIZE = "blob_file_size";
+const std::string LDBCommand::ARG_BLOB_COMPRESSION_TYPE =
+    "blob_compression_type";
+const std::string LDBCommand::ARG_ENABLE_BLOB_GARBAGE_COLLECTION =
+    "enable_blob_garbage_collection";
+const std::string LDBCommand::ARG_BLOB_GARBAGE_COLLECTION_AGE_CUTOFF =
+    "blob_garbage_collection_age_cutoff";
+const std::string LDBCommand::ARG_BLOB_GARBAGE_COLLECTION_FORCE_THRESHOLD =
+    "blob_garbage_collection_force_threshold";
+const std::string LDBCommand::ARG_BLOB_COMPACTION_READAHEAD_SIZE =
+    "blob_compaction_readahead_size";
 
 const char* LDBCommand::DELIM = " ==> ";
 
@@ -348,7 +361,7 @@ LDBCommand::LDBCommand(const std::map<std::string, std::string>& options,
       option_map_(options),
       flags_(flags),
       valid_cmd_line_options_(valid_cmd_line_options) {
-  std::map<std::string, std::string>::const_iterator itr = options.find(ARG_DB);
+  auto itr = options.find(ARG_DB);
   if (itr != options.end()) {
     db_path_ = itr->second;
   }
@@ -383,6 +396,9 @@ LDBCommand::LDBCommand(const std::map<std::string, std::string>& options,
   try_load_options_ = IsFlagPresent(flags, ARG_TRY_LOAD_OPTIONS);
   force_consistency_checks_ =
       !IsFlagPresent(flags, ARG_DISABLE_CONSISTENCY_CHECKS);
+  enable_blob_files_ = IsFlagPresent(flags, ARG_ENABLE_BLOB_FILES);
+  enable_blob_garbage_collection_ =
+      IsFlagPresent(flags, ARG_ENABLE_BLOB_GARBAGE_COLLECTION);
   config_options_.ignore_unknown_options =
       IsFlagPresent(flags, ARG_IGNORE_UNKNOWN_OPTIONS);
 }
@@ -508,12 +524,61 @@ std::vector<std::string> LDBCommand::BuildCmdLineOptions(
                                   ARG_FIX_PREFIX_LEN,
                                   ARG_TRY_LOAD_OPTIONS,
                                   ARG_DISABLE_CONSISTENCY_CHECKS,
+                                  ARG_ENABLE_BLOB_FILES,
+                                  ARG_MIN_BLOB_SIZE,
+                                  ARG_BLOB_FILE_SIZE,
+                                  ARG_BLOB_COMPRESSION_TYPE,
+                                  ARG_ENABLE_BLOB_GARBAGE_COLLECTION,
+                                  ARG_BLOB_GARBAGE_COLLECTION_AGE_CUTOFF,
+                                  ARG_BLOB_GARBAGE_COLLECTION_FORCE_THRESHOLD,
+                                  ARG_BLOB_COMPACTION_READAHEAD_SIZE,
                                   ARG_IGNORE_UNKNOWN_OPTIONS,
                                   ARG_CF_NAME};
   ret.insert(ret.end(), options.begin(), options.end());
   return ret;
 }
 
+/**
+ * Parses the specific double option and fills in the value.
+ * Returns true if the option is found.
+ * Returns false if the option is not found or if there is an error parsing the
+ * value.  If there is an error, the specified exec_state is also
+ * updated.
+ */
+bool LDBCommand::ParseDoubleOption(
+    const std::map<std::string, std::string>& /*options*/,
+    const std::string& option, double& value,
+    LDBCommandExecuteResult& exec_state) {
+  auto itr = option_map_.find(option);
+  if (itr != option_map_.end()) {
+#if defined(CYGWIN)
+    char* str_end = nullptr;
+    value = std::strtod(itr->second.c_str(), &str_end);
+    if (str_end == itr->second.c_str()) {
+      exec_state =
+          LDBCommandExecuteResult::Failed(option + " has an invalid value.");
+    } else if (errno == ERANGE) {
+      exec_state = LDBCommandExecuteResult::Failed(
+          option + " has a value out-of-range.");
+    } else {
+      return true;
+    }
+#else
+    try {
+      value = std::stod(itr->second);
+      return true;
+    } catch (const std::invalid_argument&) {
+      exec_state =
+          LDBCommandExecuteResult::Failed(option + " has an invalid value.");
+    } catch (const std::out_of_range&) {
+      exec_state = LDBCommandExecuteResult::Failed(
+          option + " has a value out-of-range.");
+    }
+#endif
+  }
+  return false;
+}
+
 /**
  * Parses the specific integer option and fills in the value.
  * Returns true if the option is found.
@@ -525,15 +590,23 @@ bool LDBCommand::ParseIntOption(
     const std::map<std::string, std::string>& /*options*/,
     const std::string& option, int& value,
     LDBCommandExecuteResult& exec_state) {
-  std::map<std::string, std::string>::const_iterator itr =
+  auto itr = option_map_.find(option);
-      option_map_.find(option);
   if (itr != option_map_.end()) {
-    try {
 #if defined(CYGWIN)
-      value = strtol(itr->second.c_str(), 0, 10);
+    char* str_end = nullptr;
+    value = strtol(itr->second.c_str(), &str_end, 10);
+    if (str_end == itr->second.c_str()) {
+      exec_state =
+          LDBCommandExecuteResult::Failed(option + " has an invalid value.");
+    } else if (errno == ERANGE) {
+      exec_state = LDBCommandExecuteResult::Failed(
+          option + " has a value out-of-range.");
+    } else {
+      return true;
+    }
 #else
+    try {
       value = std::stoi(itr->second);
-#endif
       return true;
     } catch (const std::invalid_argument&) {
       exec_state =
@@ -542,6 +615,7 @@ bool LDBCommand::ParseIntOption(
       exec_state = LDBCommandExecuteResult::Failed(
           option + " has a value out-of-range.");
     }
+#endif
   }
   return false;
 }
@@ -562,6 +636,51 @@ bool LDBCommand::ParseStringOption(
   return false;
 }
 
+/**
+ * Parses the specified compression type and fills in the value.
+ * Returns true if the compression type is found.
+ * Returns false otherwise.
+ */
+bool LDBCommand::ParseCompressionTypeOption(
+    const std::map<std::string, std::string>& /*options*/,
+    const std::string& option, CompressionType& value,
+    LDBCommandExecuteResult& exec_state) {
+  auto itr = option_map_.find(option);
+  if (itr != option_map_.end()) {
+    const std::string& comp = itr->second;
+    if (comp == "no") {
+      value = kNoCompression;
+      return true;
+    } else if (comp == "snappy") {
+      value = kSnappyCompression;
+      return true;
+    } else if (comp == "zlib") {
+      value = kZlibCompression;
+      return true;
+    } else if (comp == "bzip2") {
+      value = kBZip2Compression;
+      return true;
+    } else if (comp == "lz4") {
+      value = kLZ4Compression;
+      return true;
+    } else if (comp == "lz4hc") {
+      value = kLZ4HCCompression;
+      return true;
+    } else if (comp == "xpress") {
+      value = kXpressCompression;
+      return true;
+    } else if (comp == "zstd") {
+      value = kZSTD;
+      return true;
+    } else {
+      // Unknown compression.
+      exec_state = LDBCommandExecuteResult::Failed(
+          "Unknown compression algorithm: " + comp);
+    }
+  }
+  return false;
+}
+
 void LDBCommand::OverrideBaseOptions() {
   options_.create_if_missing = false;
 
@@ -614,37 +733,88 @@ void LDBCommand::OverrideBaseCFOptions(ColumnFamilyOptions* cf_opts) {
     cf_opts->table_factory.reset(NewBlockBasedTableFactory(table_options));
   }
 
-  auto itr = option_map_.find(ARG_AUTO_COMPACTION);
+  cf_opts->enable_blob_files = enable_blob_files_;
-  if (itr != option_map_.end()) {
+
-    cf_opts->disable_auto_compactions = !StringToBool(itr->second);
+  int min_blob_size;
+  if (ParseIntOption(option_map_, ARG_MIN_BLOB_SIZE, min_blob_size,
+                     exec_state_)) {
+    if (min_blob_size >= 0) {
+      cf_opts->min_blob_size = min_blob_size;
+    } else {
+      exec_state_ =
+          LDBCommandExecuteResult::Failed(ARG_MIN_BLOB_SIZE + " must be >= 0.");
+    }
   }
 
-  itr = option_map_.find(ARG_COMPRESSION_TYPE);
+  int blob_file_size;
-  if (itr != option_map_.end()) {
+  if (ParseIntOption(option_map_, ARG_BLOB_FILE_SIZE, blob_file_size,
-    std::string comp = itr->second;
+                     exec_state_)) {
-    if (comp == "no") {
+    if (blob_file_size > 0) {
-      cf_opts->compression = kNoCompression;
+      cf_opts->blob_file_size = blob_file_size;
-    } else if (comp == "snappy") {
-      cf_opts->compression = kSnappyCompression;
-    } else if (comp == "zlib") {
-      cf_opts->compression = kZlibCompression;
-    } else if (comp == "bzip2") {
-      cf_opts->compression = kBZip2Compression;
-    } else if (comp == "lz4") {
-      cf_opts->compression = kLZ4Compression;
-    } else if (comp == "lz4hc") {
-      cf_opts->compression = kLZ4HCCompression;
-    } else if (comp == "xpress") {
-      cf_opts->compression = kXpressCompression;
-    } else if (comp == "zstd") {
-      cf_opts->compression = kZSTD;
     } else {
-      // Unknown compression.
       exec_state_ =
-          LDBCommandExecuteResult::Failed("Unknown compression level: " + comp);
+          LDBCommandExecuteResult::Failed(ARG_BLOB_FILE_SIZE + " must be > 0.");
+    }
+  }
+
+  cf_opts->enable_blob_garbage_collection = enable_blob_garbage_collection_;
+
+  double blob_garbage_collection_age_cutoff;
+  if (ParseDoubleOption(option_map_, ARG_BLOB_GARBAGE_COLLECTION_AGE_CUTOFF,
+                        blob_garbage_collection_age_cutoff, exec_state_)) {
+    if (blob_garbage_collection_age_cutoff >= 0 &&
+        blob_garbage_collection_age_cutoff <= 1) {
+      cf_opts->blob_garbage_collection_age_cutoff =
+          blob_garbage_collection_age_cutoff;
+    } else {
+      exec_state_ = LDBCommandExecuteResult::Failed(
+          ARG_BLOB_GARBAGE_COLLECTION_AGE_CUTOFF + " must be >= 0 and <= 1.");
+    }
+  }
+
+  double blob_garbage_collection_force_threshold;
+  if (ParseDoubleOption(option_map_,
+                        ARG_BLOB_GARBAGE_COLLECTION_FORCE_THRESHOLD,
+                        blob_garbage_collection_force_threshold, exec_state_)) {
+    if (blob_garbage_collection_force_threshold >= 0 &&
+        blob_garbage_collection_force_threshold <= 1) {
+      cf_opts->blob_garbage_collection_force_threshold =
+          blob_garbage_collection_force_threshold;
+    } else {
+      exec_state_ = LDBCommandExecuteResult::Failed(
+          ARG_BLOB_GARBAGE_COLLECTION_FORCE_THRESHOLD +
+          " must be >= 0 and <= 1.");
+    }
+  }
+
+  int blob_compaction_readahead_size;
+  if (ParseIntOption(option_map_, ARG_BLOB_COMPACTION_READAHEAD_SIZE,
+                     blob_compaction_readahead_size, exec_state_)) {
+    if (blob_compaction_readahead_size > 0) {
+      cf_opts->blob_compaction_readahead_size = blob_compaction_readahead_size;
+    } else {
+      exec_state_ = LDBCommandExecuteResult::Failed(
+          ARG_BLOB_COMPACTION_READAHEAD_SIZE + " must be > 0.");
     }
   }
 
+  auto itr = option_map_.find(ARG_AUTO_COMPACTION);
+  if (itr != option_map_.end()) {
+    cf_opts->disable_auto_compactions = !StringToBool(itr->second);
+  }
+
+  CompressionType compression_type;
+  if (ParseCompressionTypeOption(option_map_, ARG_COMPRESSION_TYPE,
+                                 compression_type, exec_state_)) {
+    cf_opts->compression = compression_type;
+  }
+
+  CompressionType blob_compression_type;
+  if (ParseCompressionTypeOption(option_map_, ARG_BLOB_COMPRESSION_TYPE,
+                                 blob_compression_type, exec_state_)) {
+    cf_opts->blob_compression_type = blob_compression_type;
+  }
+
   int compression_max_dict_bytes;
   if (ParseIntOption(option_map_, ARG_COMPRESSION_MAX_DICT_BYTES,
                      compression_max_dict_bytes, exec_state_)) {
@@ -793,9 +963,7 @@ bool LDBCommand::ParseKeyValue(const std::string& line, std::string* key,
  * appropriate error msg to stderr.
  */
 bool LDBCommand::ValidateCmdLineOptions() {
-  for (std::map<std::string, std::string>::const_iterator itr =
+  for (auto itr = option_map_.begin(); itr != option_map_.end(); ++itr) {
-           option_map_.begin();
-       itr != option_map_.end(); ++itr) {
     if (std::find(valid_cmd_line_options_.begin(),
                   valid_cmd_line_options_.end(),
                   itr->first) == valid_cmd_line_options_.end()) {
@@ -884,7 +1052,7 @@ bool LDBCommand::IsValueHex(const std::map<std::string, std::string>& options,
 bool LDBCommand::ParseBooleanOption(
     const std::map<std::string, std::string>& options,
     const std::string& option, bool default_val) {
-  std::map<std::string, std::string>::const_iterator itr = options.find(option);
+  auto itr = options.find(option);
   if (itr != options.end()) {
     std::string option_val = itr->second;
     return StringToBool(itr->second);
@@ -914,8 +1082,7 @@ CompactorCommand::CompactorCommand(
                                       ARG_VALUE_HEX, ARG_TTL})),
       null_from_(true),
       null_to_(true) {
-  std::map<std::string, std::string>::const_iterator itr =
+  auto itr = options.find(ARG_FROM);
-      options.find(ARG_FROM);
   if (itr != options.end()) {
     null_from_ = false;
     from_ = itr->second;
@@ -1122,8 +1289,7 @@ ManifestDumpCommand::ManifestDumpCommand(
   verbose_ = IsFlagPresent(flags, ARG_VERBOSE);
   json_ = IsFlagPresent(flags, ARG_JSON);
 
-  std::map<std::string, std::string>::const_iterator itr =
+  auto itr = options.find(ARG_PATH);
-      options.find(ARG_PATH);
   if (itr != options.end()) {
     path_ = itr->second;
     if (path_.empty()) {
@@ -1264,8 +1430,7 @@ FileChecksumDumpCommand::FileChecksumDumpCommand(
     : LDBCommand(options, flags, false,
                  BuildCmdLineOptions({ARG_PATH, ARG_HEX})),
       path_("") {
-  std::map<std::string, std::string>::const_iterator itr =
+  auto itr = options.find(ARG_PATH);
-      options.find(ARG_PATH);
   if (itr != options.end()) {
     path_ = itr->second;
     if (path_.empty()) {
@@ -1540,8 +1705,7 @@ InternalDumpCommand::InternalDumpCommand(
   has_to_ = ParseStringOption(options, ARG_TO, &to_);
 
   ParseIntOption(options, ARG_MAX_KEYS, max_keys_, exec_state_);
-  std::map<std::string, std::string>::const_iterator itr =
+  auto itr = options.find(ARG_COUNT_DELIM);
-      options.find(ARG_COUNT_DELIM);
   if (itr != options.end()) {
     delim_ = itr->second;
     count_delim_ = true;
@@ -1676,8 +1840,7 @@ DBDumperCommand::DBDumperCommand(
       count_only_(false),
       count_delim_(false),
       print_stats_(false) {
-  std::map<std::string, std::string>::const_iterator itr =
+  auto itr = options.find(ARG_FROM);
-      options.find(ARG_FROM);
   if (itr != options.end()) {
     null_from_ = false;
     from_ = itr->second;
@@ -2442,8 +2605,7 @@ WALDumperCommand::WALDumperCommand(
       is_write_committed_(false) {
   wal_file_.clear();
 
-  std::map<std::string, std::string>::const_iterator itr =
+  auto itr = options.find(ARG_WAL_FILE);
-      options.find(ARG_WAL_FILE);
   if (itr != options.end()) {
     wal_file_ = itr->second;
   }
@@ -2662,8 +2824,7 @@ ScanCommand::ScanCommand(const std::vector<std::string>& /*params*/,
       end_key_specified_(false),
       max_keys_scanned_(-1),
       no_value_(false) {
-  std::map<std::string, std::string>::const_iterator itr =
+  auto itr = options.find(ARG_FROM);
-      options.find(ARG_FROM);
   if (itr != options.end()) {
     start_key_ = itr->second;
     if (is_key_hex_) {
@@ -3750,8 +3911,7 @@ ListFileRangeDeletesCommand::ListFileRangeDeletesCommand(
     const std::map<std::string, std::string>& options,
     const std::vector<std::string>& flags)
     : LDBCommand(options, flags, true, BuildCmdLineOptions({ARG_MAX_KEYS})) {
-  std::map<std::string, std::string>::const_iterator itr =
+  auto itr = options.find(ARG_MAX_KEYS);
-      options.find(ARG_MAX_KEYS);
   if (itr != options.end()) {
     try {
 #if defined(CYGWIN)

tools/ldb_test.py

@@ -165,6 +165,32 @@ class LDBTestCase(unittest.TestCase):
         self.assertRunFAIL("batchput k1")
         self.assertRunFAIL("batchput k1 v1 k2")
 
+    def testBlobBatchPut(self):
+        print("Running testBlobBatchPut...")
+
+        dbPath = os.path.join(self.TMP_DIR, self.DB_NAME)
+        self.assertRunOK("batchput x1 y1 --create_if_missing --enable_blob_files", "OK")
+        self.assertRunOK("scan", "x1 : y1")
+        self.assertRunOK("batchput --enable_blob_files x2 y2 x3 y3 \"x4 abc\" \"y4 xyz\"", "OK")
+        self.assertRunOK("scan", "x1 : y1\nx2 : y2\nx3 : y3\nx4 abc : y4 xyz")
+
+        blob_files = self.getBlobFiles(dbPath)
+        self.assertTrue(len(blob_files) >= 1)
+
+    def testBlobPut(self):
+        print("Running testBlobPut...")
+
+        dbPath = os.path.join(self.TMP_DIR, self.DB_NAME)
+        self.assertRunOK("put --create_if_missing --enable_blob_files x1 y1", "OK")
+        self.assertRunOK("get x1", "y1")
+        self.assertRunOK("put --enable_blob_files x2 y2", "OK")
+        self.assertRunOK("get x1", "y1")
+        self.assertRunOK("get x2", "y2")
+        self.assertRunFAIL("get x3")
+
+        blob_files = self.getBlobFiles(dbPath)
+        self.assertTrue(len(blob_files) >= 1)
+
     def testCountDelimDump(self):
         print("Running testCountDelimDump...")
         self.assertRunOK("batchput x.1 x1 --create_if_missing", "OK")
@@ -340,6 +366,21 @@ class LDBTestCase(unittest.TestCase):
         self.assertFalse(self.dumpDb(
             "--db=%s --create_if_missing" % origDbPath, dumpFilePath))
 
+        # Dump and load with BlobDB enabled
+        blobParams = " ".join(["--enable_blob_files", "--min_blob_size=1",
+                                "--blob_file_size=2097152"])
+        dumpFilePath = os.path.join(self.TMP_DIR, "dump9")
+        loadedDbPath = os.path.join(self.TMP_DIR, "loaded_from_dump9")
+        self.assertTrue(self.dumpDb(
+            "--db=%s" % (origDbPath), dumpFilePath))
+        self.assertTrue(self.loadDb(
+            "--db=%s %s --create_if_missing --disable_wal" % (loadedDbPath, blobParams),
+            dumpFilePath))
+        self.assertRunOKFull("scan --db=%s" % loadedDbPath,
+                "x1 : y1\nx2 : y2\nx3 : y3\nx4 : y4")
+        blob_files = self.getBlobFiles(loadedDbPath)
+        self.assertTrue(len(blob_files) >= 1)
+
     def testIDumpBasics(self):
         print("Running testIDumpBasics...")
         self.assertRunOK("put a val --create_if_missing", "OK")
@@ -549,6 +590,9 @@ class LDBTestCase(unittest.TestCase):
     def getWALFiles(self, directory):
         return glob.glob(directory + "/*.log")
 
+    def getBlobFiles(self, directory):
+        return glob.glob(directory + "/*.blob")
+
     def copyManifests(self, src, dest):
         return 0 == run_err_null("cp " + src + " " + dest)
 

tools/ldb_tool.cc

@@ -68,6 +68,20 @@ void LDBCommandRunner::PrintHelp(const LDBOptions& ldb_options,
   ret.append("  --" + LDBCommand::ARG_WRITE_BUFFER_SIZE +
              "=<int,e.g.:4194304>\n");
   ret.append("  --" + LDBCommand::ARG_FILE_SIZE + "=<int,e.g.:2097152>\n");
+  ret.append("  --" + LDBCommand::ARG_ENABLE_BLOB_FILES +
+             " : Enable key-value separation using BlobDB\n");
+  ret.append("  --" + LDBCommand::ARG_MIN_BLOB_SIZE + "=<int,e.g.:2097152>\n");
+  ret.append("  --" + LDBCommand::ARG_BLOB_FILE_SIZE + "=<int,e.g.:2097152>\n");
+  ret.append("  --" + LDBCommand::ARG_BLOB_COMPRESSION_TYPE +
+             "=<no|snappy|zlib|bzip2|lz4|lz4hc|xpress|zstd>\n");
+  ret.append("  --" + LDBCommand::ARG_ENABLE_BLOB_GARBAGE_COLLECTION +
+             " : Enable blob garbage collection\n");
+  ret.append("  --" + LDBCommand::ARG_BLOB_GARBAGE_COLLECTION_AGE_CUTOFF +
+             "=<double,e.g.:0.25>\n");
+  ret.append("  --" + LDBCommand::ARG_BLOB_GARBAGE_COLLECTION_FORCE_THRESHOLD +
+             "=<double,e.g.:0.25>\n");
+  ret.append("  --" + LDBCommand::ARG_BLOB_COMPACTION_READAHEAD_SIZE +
+             "=<int,e.g.:2097152>\n");
 
   ret.append("\n\n");
   ret.append("Data Access Commands:\n");