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rocksdb/options/options_parser.cc
anand76 2084cdf237 Delete temp OPTIONS file on failure to write it (#11423) 
Summary:
When the DB is opened, RocksDB creates a temp OPTIONS file, writes the current options to it, and renames it. In case of a failure, the temp file is left behind, and is not deleted by PurgeObsoleteFiles(). Fix this by explicitly deleting the temp file if writing to it or renaming it fails.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/11423

Test Plan: Add a unit test

Reviewed By: akankshamahajan15

Differential Revision: D45540454

Pulled By: anand1976

fbshipit-source-id: 47facdc30d8cc5667036312d04b21d3fc253c92e
2023-05-12 22:39:39 -07:00

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "options/options_parser.h"
#include <cmath>
#include <map>
#include <string>
#include <utility>
#include <vector>
#include "file/line_file_reader.h"
#include "file/writable_file_writer.h"
#include "options/cf_options.h"
#include "options/db_options.h"
#include "options/options_helper.h"
#include "port/port.h"
#include "rocksdb/convenience.h"
#include "rocksdb/db.h"
#include "rocksdb/utilities/options_type.h"
#include "test_util/sync_point.h"
#include "util/cast_util.h"
#include "util/string_util.h"
namespace ROCKSDB_NAMESPACE {
static const std::string option_file_header =
"# This is a RocksDB option file.\n"
"#\n"
"# For detailed file format spec, please refer to the example file\n"
"# in examples/rocksdb_option_file_example.ini\n"
"#\n"
"\n";
Status PersistRocksDBOptions(const DBOptions& db_opt,
const std::vector<std::string>& cf_names,
const std::vector<ColumnFamilyOptions>& cf_opts,
const std::string& file_name, FileSystem* fs) {
ConfigOptions
config_options; // Use default for escaped(true) and check (exact)
config_options.delimiter = "\n ";
// Do not invoke PrepareOptions when we are doing validation.
config_options.invoke_prepare_options = false;
// If a readahead size was set in the input options, use it
if (db_opt.log_readahead_size > 0) {
config_options.file_readahead_size = db_opt.log_readahead_size;
}
return PersistRocksDBOptions(config_options, db_opt, cf_names, cf_opts,
file_name, fs);
}
Status PersistRocksDBOptions(const ConfigOptions& config_options_in,
const DBOptions& db_opt,
const std::vector<std::string>& cf_names,
const std::vector<ColumnFamilyOptions>& cf_opts,
const std::string& file_name, FileSystem* fs) {
ConfigOptions config_options = config_options_in;
config_options.delimiter = "\n "; // Override the default to nl
TEST_SYNC_POINT("PersistRocksDBOptions:start");
if (cf_names.size() != cf_opts.size()) {
return Status::InvalidArgument(
"cf_names.size() and cf_opts.size() must be the same");
}
std::unique_ptr<FSWritableFile> wf;
Status s =
fs->NewWritableFile(file_name, FileOptions(), &wf, nullptr);
if (!s.ok()) {
return s;
}
std::unique_ptr<WritableFileWriter> writable;
writable.reset(new WritableFileWriter(std::move(wf), file_name, EnvOptions(),
nullptr /* statistics */));
TEST_SYNC_POINT("PersistRocksDBOptions:create");
std::string options_file_content;
s = writable->Append(
option_file_header + "[" + opt_section_titles[kOptionSectionVersion] +
"]\n"
" rocksdb_version=" +
std::to_string(ROCKSDB_MAJOR) + "." + std::to_string(ROCKSDB_MINOR) +
"." + std::to_string(ROCKSDB_PATCH) + "\n");
if (s.ok()) {
s = writable->Append(
" options_file_version=" + std::to_string(ROCKSDB_OPTION_FILE_MAJOR) +
"." + std::to_string(ROCKSDB_OPTION_FILE_MINOR) + "\n");
}
if (s.ok()) {
s = writable->Append("\n[" + opt_section_titles[kOptionSectionDBOptions] +
"]\n ");
}
if (s.ok()) {
s = GetStringFromDBOptions(config_options, db_opt, &options_file_content);
}
if (s.ok()) {
s = writable->Append(options_file_content + "\n");
}
for (size_t i = 0; s.ok() && i < cf_opts.size(); ++i) {
// CFOptions section
s = writable->Append("\n[" + opt_section_titles[kOptionSectionCFOptions] +
" \"" + EscapeOptionString(cf_names[i]) + "\"]\n ");
if (s.ok()) {
s = GetStringFromColumnFamilyOptions(config_options, cf_opts[i],
&options_file_content);
}
if (s.ok()) {
s = writable->Append(options_file_content + "\n");
}
// TableOptions section
auto* tf = cf_opts[i].table_factory.get();
if (tf != nullptr) {
if (s.ok()) {
s = writable->Append(
"[" + opt_section_titles[kOptionSectionTableOptions] + tf->Name() +
" \"" + EscapeOptionString(cf_names[i]) + "\"]\n ");
}
if (s.ok()) {
options_file_content.clear();
s = tf->GetOptionString(config_options, &options_file_content);
}
if (s.ok()) {
s = writable->Append(options_file_content + "\n");
}
}
}
if (s.ok()) {
s = writable->Sync(true /* use_fsync */);
}
if (s.ok()) {
s = writable->Close();
}
TEST_SYNC_POINT("PersistRocksDBOptions:written");
if (s.ok()) {
return RocksDBOptionsParser::VerifyRocksDBOptionsFromFile(
config_options, db_opt, cf_names, cf_opts, file_name, fs);
}
return s;
}
RocksDBOptionsParser::RocksDBOptionsParser() { Reset(); }
void RocksDBOptionsParser::Reset() {
db_opt_ = DBOptions();
db_opt_map_.clear();
cf_names_.clear();
cf_opts_.clear();
cf_opt_maps_.clear();
has_version_section_ = false;
has_db_options_ = false;
has_default_cf_options_ = false;
for (int i = 0; i < 3; ++i) {
db_version[i] = 0;
opt_file_version[i] = 0;
}
}
bool RocksDBOptionsParser::IsSection(const std::string& line) {
if (line.size() < 2) {
return false;
}
if (line[0] != '[' || line[line.size() - 1] != ']') {
return false;
}
return true;
}
Status RocksDBOptionsParser::ParseSection(OptionSection* section,
std::string* title,
std::string* argument,
const std::string& line,
const int line_num) {
*section = kOptionSectionUnknown;
// A section is of the form [<SectionName> "<SectionArg>"], where
// "<SectionArg>" is optional.
size_t arg_start_pos = line.find("\"");
size_t arg_end_pos = line.rfind("\"");
// The following if-then check tries to identify whether the input
// section has the optional section argument.
if (arg_start_pos != std::string::npos && arg_start_pos != arg_end_pos) {
*title = TrimAndRemoveComment(line.substr(1, arg_start_pos - 1), true);
*argument = UnescapeOptionString(
line.substr(arg_start_pos + 1, arg_end_pos - arg_start_pos - 1));
} else {
*title = TrimAndRemoveComment(line.substr(1, line.size() - 2), true);
*argument = "";
}
for (int i = 0; i < kOptionSectionUnknown; ++i) {
if (title->find(opt_section_titles[i]) == 0) {
if (i == kOptionSectionVersion || i == kOptionSectionDBOptions ||
i == kOptionSectionCFOptions) {
if (title->size() == opt_section_titles[i].size()) {
// if true, then it indicats equal
*section = static_cast<OptionSection>(i);
return CheckSection(*section, *argument, line_num);
}
} else if (i == kOptionSectionTableOptions) {
// This type of sections has a sufffix at the end of the
// section title
if (title->size() > opt_section_titles[i].size()) {
*section = static_cast<OptionSection>(i);
return CheckSection(*section, *argument, line_num);
}
}
}
}
return Status::InvalidArgument(std::string("Unknown section ") + line);
}
Status RocksDBOptionsParser::InvalidArgument(const int line_num,
const std::string& message) {
return Status::InvalidArgument(
"[RocksDBOptionsParser Error] ",
message + " (at line " + std::to_string(line_num) + ")");
}
Status RocksDBOptionsParser::ParseStatement(std::string* name,
std::string* value,
const std::string& line,
const int line_num) {
size_t eq_pos = line.find("=");
if (eq_pos == std::string::npos) {
return InvalidArgument(line_num, "A valid statement must have a '='.");
}
*name = TrimAndRemoveComment(line.substr(0, eq_pos), true);
*value =
TrimAndRemoveComment(line.substr(eq_pos + 1, line.size() - eq_pos - 1));
if (name->empty()) {
return InvalidArgument(line_num,
"A valid statement must have a variable name.");
}
return Status::OK();
}
Status RocksDBOptionsParser::Parse(const std::string& file_name, FileSystem* fs,
bool ignore_unknown_options,
size_t file_readahead_size) {
ConfigOptions
config_options; // Use default for escaped(true) and check (exact)
config_options.ignore_unknown_options = ignore_unknown_options;
if (file_readahead_size > 0) {
config_options.file_readahead_size = file_readahead_size;
}
return Parse(config_options, file_name, fs);
}
Status RocksDBOptionsParser::Parse(const ConfigOptions& config_options_in,
const std::string& file_name,
FileSystem* fs) {
Reset();
ConfigOptions config_options = config_options_in;
std::unique_ptr<FSSequentialFile> seq_file;
Status s = fs->NewSequentialFile(file_name, FileOptions(), &seq_file,
nullptr);
if (!s.ok()) {
return s;
}
LineFileReader lf_reader(std::move(seq_file), file_name,
config_options.file_readahead_size);
OptionSection section = kOptionSectionUnknown;
std::string title;
std::string argument;
std::unordered_map<std::string, std::string> opt_map;
std::string line;
// we only support single-lined statement.
while (lf_reader.ReadLine(&line, Env::IO_TOTAL /* rate_limiter_priority */)) {
int line_num = static_cast<int>(lf_reader.GetLineNumber());
line = TrimAndRemoveComment(line);
if (line.empty()) {
continue;
}
if (IsSection(line)) {
s = EndSection(config_options, section, title, argument, opt_map);
opt_map.clear();
if (!s.ok()) {
return s;
}
// If the option file is not generated by a higher minor version,
// there shouldn't be any unknown option.
if (config_options.ignore_unknown_options &&
section == kOptionSectionVersion) {
if (db_version[0] < ROCKSDB_MAJOR || (db_version[0] == ROCKSDB_MAJOR &&
db_version[1] <= ROCKSDB_MINOR)) {
config_options.ignore_unknown_options = false;
}
}
s = ParseSection(&section, &title, &argument, line, line_num);
if (!s.ok()) {
return s;
}
} else {
std::string name;
std::string value;
s = ParseStatement(&name, &value, line, line_num);
if (!s.ok()) {
return s;
}
opt_map.insert({name, value});
}
}
s = lf_reader.GetStatus();
if (!s.ok()) {
return s;
}
s = EndSection(config_options, section, title, argument, opt_map);
opt_map.clear();
if (!s.ok()) {
return s;
}
return ValidityCheck();
}
Status RocksDBOptionsParser::CheckSection(const OptionSection section,
const std::string& section_arg,
const int line_num) {
if (section == kOptionSectionDBOptions) {
if (has_db_options_) {
return InvalidArgument(
line_num,
"More than one DBOption section found in the option config file");
}
has_db_options_ = true;
} else if (section == kOptionSectionCFOptions) {
bool is_default_cf = (section_arg == kDefaultColumnFamilyName);
if (cf_opts_.size() == 0 && !is_default_cf) {
return InvalidArgument(
line_num,
"Default column family must be the first CFOptions section "
"in the option config file");
} else if (cf_opts_.size() != 0 && is_default_cf) {
return InvalidArgument(
line_num,
"Default column family must be the first CFOptions section "
"in the optio/n config file");
} else if (GetCFOptions(section_arg) != nullptr) {
return InvalidArgument(
line_num,
"Two identical column families found in option config file");
}
has_default_cf_options_ |= is_default_cf;
} else if (section == kOptionSectionTableOptions) {
if (GetCFOptions(section_arg) == nullptr) {
return InvalidArgument(
line_num, std::string(
"Does not find a matched column family name in "
"TableOptions section. Column Family Name:") +
section_arg);
}
} else if (section == kOptionSectionVersion) {
if (has_version_section_) {
return InvalidArgument(
line_num,
"More than one Version section found in the option config file.");
}
has_version_section_ = true;
}
return Status::OK();
}
Status RocksDBOptionsParser::ParseVersionNumber(const std::string& ver_name,
const std::string& ver_string,
const int max_count,
int* version) {
int version_index = 0;
int current_number = 0;
int current_digit_count = 0;
bool has_dot = false;
for (int i = 0; i < max_count; ++i) {
version[i] = 0;
}
constexpr int kBufferSize = 200;
char buffer[kBufferSize];
for (size_t i = 0; i < ver_string.size(); ++i) {
if (ver_string[i] == '.') {
if (version_index >= max_count - 1) {
snprintf(buffer, sizeof(buffer) - 1,
"A valid %s can only contains at most %d dots.",
ver_name.c_str(), max_count - 1);
return Status::InvalidArgument(buffer);
}
if (current_digit_count == 0) {
snprintf(buffer, sizeof(buffer) - 1,
"A valid %s must have at least one digit before each dot.",
ver_name.c_str());
return Status::InvalidArgument(buffer);
}
version[version_index++] = current_number;
current_number = 0;
current_digit_count = 0;
has_dot = true;
} else if (isdigit(ver_string[i])) {
current_number = current_number * 10 + (ver_string[i] - '0');
current_digit_count++;
} else {
snprintf(buffer, sizeof(buffer) - 1,
"A valid %s can only contains dots and numbers.",
ver_name.c_str());
return Status::InvalidArgument(buffer);
}
}
version[version_index] = current_number;
if (has_dot && current_digit_count == 0) {
snprintf(buffer, sizeof(buffer) - 1,
"A valid %s must have at least one digit after each dot.",
ver_name.c_str());
return Status::InvalidArgument(buffer);
}
return Status::OK();
}
Status RocksDBOptionsParser::EndSection(
const ConfigOptions& config_options, const OptionSection section,
const std::string& section_title, const std::string& section_arg,
const std::unordered_map<std::string, std::string>& opt_map) {
Status s;
if (section == kOptionSectionDBOptions) {
s = GetDBOptionsFromMap(config_options, DBOptions(), opt_map, &db_opt_);
if (!s.ok()) {
return s;
}
db_opt_map_ = opt_map;
} else if (section == kOptionSectionCFOptions) {
// This condition should be ensured earlier in ParseSection
// so we make an assertion here.
assert(GetCFOptions(section_arg) == nullptr);
cf_names_.emplace_back(section_arg);
cf_opts_.emplace_back();
s = GetColumnFamilyOptionsFromMap(config_options, ColumnFamilyOptions(),
opt_map, &cf_opts_.back());
if (!s.ok()) {
return s;
}
// keep the parsed string.
cf_opt_maps_.emplace_back(opt_map);
} else if (section == kOptionSectionTableOptions) {
assert(GetCFOptions(section_arg) != nullptr);
auto* cf_opt = GetCFOptionsImpl(section_arg);
if (cf_opt == nullptr) {
return Status::InvalidArgument(
"The specified column family must be defined before the "
"TableOptions section:",
section_arg);
}
// Ignore error as table factory deserialization is optional
cf_opt->table_factory.reset();
s = TableFactory::CreateFromString(
config_options,
section_title.substr(
opt_section_titles[kOptionSectionTableOptions].size()),
&(cf_opt->table_factory));
if (s.ok() && cf_opt->table_factory != nullptr) {
s = cf_opt->table_factory->ConfigureFromMap(config_options, opt_map);
// Translate any errors (NotFound, NotSupported, to InvalidArgument
if (s.ok() || s.IsInvalidArgument()) {
return s;
} else {
return Status::InvalidArgument(s.getState());
}
} else {
// Return OK for not supported table factories as TableFactory
// Deserialization is optional.
cf_opt->table_factory.reset();
return Status::OK();
}
} else if (section == kOptionSectionVersion) {
for (const auto& pair : opt_map) {
if (pair.first == "rocksdb_version") {
s = ParseVersionNumber(pair.first, pair.second, 3, db_version);
if (!s.ok()) {
return s;
}
} else if (pair.first == "options_file_version") {
s = ParseVersionNumber(pair.first, pair.second, 2, opt_file_version);
if (!s.ok()) {
return s;
}
if (opt_file_version[0] < 1) {
return Status::InvalidArgument(
"A valid options_file_version must be at least 1.");
}
}
}
}
return s;
}
Status RocksDBOptionsParser::ValidityCheck() {
if (!has_db_options_) {
return Status::Corruption(
"A RocksDB Option file must have a single DBOptions section");
}
if (!has_default_cf_options_) {
return Status::Corruption(
"A RocksDB Option file must have a single CFOptions:default section");
}
return Status::OK();
}
std::string RocksDBOptionsParser::TrimAndRemoveComment(const std::string& line,
bool trim_only) {
size_t start = 0;
size_t end = line.size();
// we only support "#" style comment
if (!trim_only) {
size_t search_pos = 0;
while (search_pos < line.size()) {
size_t comment_pos = line.find('#', search_pos);
if (comment_pos == std::string::npos) {
break;
}
if (comment_pos == 0 || line[comment_pos - 1] != '\\') {
end = comment_pos;
break;
}
search_pos = comment_pos + 1;
}
}
while (start < end && isspace(line[start]) != 0) {
++start;
}
// start < end implies end > 0.
while (start < end && isspace(line[end - 1]) != 0) {
--end;
}
if (start < end) {
return line.substr(start, end - start);
}
return "";
}
Status RocksDBOptionsParser::VerifyRocksDBOptionsFromFile(
const ConfigOptions& config_options_in, const DBOptions& db_opt,
const std::vector<std::string>& cf_names,
const std::vector<ColumnFamilyOptions>& cf_opts,
const std::string& file_name, FileSystem* fs) {
RocksDBOptionsParser parser;
ConfigOptions config_options = config_options_in;
config_options.invoke_prepare_options =
false; // No need to do a prepare for verify
if (config_options.sanity_level < ConfigOptions::kSanityLevelExactMatch) {
// If we are not doing an exact comparison, we should ignore
// unsupported options, as they may cause the Parse to fail
// (if the ObjectRegistry is not initialized)
config_options.ignore_unsupported_options = true;
}
Status s = parser.Parse(config_options, file_name, fs);
if (!s.ok()) {
return s;
}
// Verify DBOptions
s = VerifyDBOptions(config_options, db_opt, *parser.db_opt(),
parser.db_opt_map());
if (!s.ok()) {
return s;
}
// Verify ColumnFamily Name
if (cf_names.size() != parser.cf_names()->size()) {
if (config_options.sanity_level >=
ConfigOptions::kSanityLevelLooselyCompatible) {
return Status::InvalidArgument(
"[RocksDBOptionParser Error] The persisted options does not have "
"the same number of column family names as the db instance.");
} else if (cf_opts.size() > parser.cf_opts()->size()) {
return Status::InvalidArgument(
"[RocksDBOptionsParser Error]",
"The persisted options file has less number of column family "
"names than that of the specified one.");
}
}
for (size_t i = 0; i < cf_names.size(); ++i) {
if (cf_names[i] != parser.cf_names()->at(i)) {
return Status::InvalidArgument(
"[RocksDBOptionParser Error] The persisted options and the db"
"instance does not have the same name for column family ",
std::to_string(i));
}
}
// Verify Column Family Options
if (cf_opts.size() != parser.cf_opts()->size()) {
if (config_options.sanity_level >=
ConfigOptions::kSanityLevelLooselyCompatible) {
return Status::InvalidArgument(
"[RocksDBOptionsParser Error]",
"The persisted options does not have the same number of "
"column families as the db instance.");
} else if (cf_opts.size() > parser.cf_opts()->size()) {
return Status::InvalidArgument(
"[RocksDBOptionsParser Error]",
"The persisted options file has less number of column families "
"than that of the specified number.");
}
}
for (size_t i = 0; i < cf_opts.size(); ++i) {
s = VerifyCFOptions(config_options, cf_opts[i], parser.cf_opts()->at(i),
&(parser.cf_opt_maps()->at(i)));
if (!s.ok()) {
return s;
}
s = VerifyTableFactory(config_options, cf_opts[i].table_factory.get(),
parser.cf_opts()->at(i).table_factory.get());
if (!s.ok()) {
return s;
}
}
return Status::OK();
}
Status RocksDBOptionsParser::VerifyDBOptions(
const ConfigOptions& config_options, const DBOptions& base_opt,
const DBOptions& file_opt,
const std::unordered_map<std::string, std::string>* opt_map) {
auto base_config = DBOptionsAsConfigurable(base_opt, opt_map);
auto file_config = DBOptionsAsConfigurable(file_opt, opt_map);
std::string mismatch;
if (!base_config->AreEquivalent(config_options, file_config.get(),
&mismatch)) {
const size_t kBufferSize = 2048;
char buffer[kBufferSize];
std::string base_value;
std::string file_value;
int offset = snprintf(buffer, sizeof(buffer),
"[RocksDBOptionsParser]: "
"failed the verification on DBOptions::%s -- ",
mismatch.c_str());
Status s = base_config->GetOption(config_options, mismatch, &base_value);
if (s.ok()) {
s = file_config->GetOption(config_options, mismatch, &file_value);
}
assert(offset >= 0);
assert(static_cast<size_t>(offset) < sizeof(buffer));
if (s.ok()) {
snprintf(buffer + offset, sizeof(buffer) - static_cast<size_t>(offset),
"-- The specified one is %s while the persisted one is %s.\n",
base_value.c_str(), file_value.c_str());
} else {
snprintf(buffer + offset, sizeof(buffer) - static_cast<size_t>(offset),
"-- Unable to re-serialize an option: %s.\n",
s.ToString().c_str());
}
return Status::InvalidArgument(Slice(buffer, strlen(buffer)));
}
return Status::OK();
}
Status RocksDBOptionsParser::VerifyCFOptions(
const ConfigOptions& config_options, const ColumnFamilyOptions& base_opt,
const ColumnFamilyOptions& file_opt,
const std::unordered_map<std::string, std::string>* opt_map) {
auto base_config = CFOptionsAsConfigurable(base_opt, opt_map);
auto file_config = CFOptionsAsConfigurable(file_opt, opt_map);
std::string mismatch;
if (!base_config->AreEquivalent(config_options, file_config.get(),
&mismatch)) {
std::string base_value;
std::string file_value;
// The options do not match
const size_t kBufferSize = 2048;
char buffer[kBufferSize];
Status s = base_config->GetOption(config_options, mismatch, &base_value);
if (s.ok()) {
s = file_config->GetOption(config_options, mismatch, &file_value);
// In file_opt, certain options like MergeOperator may be nullptr due to
// factor methods not available. So we use opt_map to get
// option value to use in the error message below.
if (s.ok() && file_value == kNullptrString && opt_map) {
auto const& opt_val_str = (opt_map->find(mismatch));
if (opt_val_str != opt_map->end()) {
file_value = opt_val_str->second;
}
}
}
int offset = snprintf(buffer, sizeof(buffer),
"[RocksDBOptionsParser]: "
"failed the verification on ColumnFamilyOptions::%s",
mismatch.c_str());
assert(offset >= 0);
assert(static_cast<size_t>(offset) < sizeof(buffer));
if (s.ok()) {
snprintf(buffer + offset, sizeof(buffer) - static_cast<size_t>(offset),
"--- The specified one is %s while the persisted one is %s.\n",
base_value.c_str(), file_value.c_str());
} else {
snprintf(buffer + offset, sizeof(buffer) - static_cast<size_t>(offset),
"--- Unable to re-serialize an option: %s.\n",
s.ToString().c_str());
}
return Status::InvalidArgument(Slice(buffer, sizeof(buffer)));
} // For each option
return Status::OK();
}
Status RocksDBOptionsParser::VerifyTableFactory(
const ConfigOptions& config_options, const TableFactory* base_tf,
const TableFactory* file_tf) {
std::string mismatch;
if (base_tf && file_tf) {
if (config_options.sanity_level > ConfigOptions::kSanityLevelNone &&
std::string(base_tf->Name()) != std::string(file_tf->Name())) {
return Status::Corruption(
"[RocksDBOptionsParser]: "
"failed the verification on TableFactory->Name()");
} else if (!base_tf->AreEquivalent(config_options, file_tf, &mismatch)) {
return Status::Corruption(std::string("[RocksDBOptionsParser]:"
"failed the verification on ") +
base_tf->Name() + "::",
mismatch);
}
} else {
// TODO(yhchiang): further support sanity check here
}
return Status::OK();
}
} // namespace ROCKSDB_NAMESPACE
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