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rocksdb/options/options_parser.cc
Andrew Kryczka 1c84660457 prototype status check enforcement (#6798) 
Summary:
Tried making Status object enforce that it is checked in some way. In cases it is not checked, `PermitUncheckedError()` must be called explicitly.

Added a way to run tests (`ASSERT_STATUS_CHECKED=1 make -j48 check`) on a
whitelist. The effort appears significant to get each test to pass with
this assertion, so I only fixed up enough to get one test (`options_test`)
working and added it to the whitelist.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6798

Reviewed By: pdillinger

Differential Revision: D21377404

Pulled By: ajkr

fbshipit-source-id: 73236f9c8df38f01cf24ecac4a6d1661b72d077e
2020-05-08 12:40:43 -07:00

753 lines
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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).
#ifndef ROCKSDB_LITE
#include "options/options_parser.h"
#include <cmath>
#include <map>
#include <string>
#include <utility>
#include <vector>
#include "file/read_write_util.h"
#include "file/writable_file_writer.h"
#include "options/options_helper.h"
#include "port/port.h"
#include "rocksdb/convenience.h"
#include "rocksdb/db.h"
#include "table/block_based/block_based_table_factory.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 ";
// 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 */));
std::string options_file_content;
s = writable->Append(option_file_header + "[" +
opt_section_titles[kOptionSectionVersion] +
"]\n"
" rocksdb_version=" +
ToString(ROCKSDB_MAJOR) + "." + ToString(ROCKSDB_MINOR) +
"." + ToString(ROCKSDB_PATCH) + "\n");
if (s.ok()) {
s = writable->Append(
" options_file_version=" + ToString(ROCKSDB_OPTION_FILE_MAJOR) + "." +
ToString(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();
}
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 " + ToString(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;
}
SequentialFileReader sf_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::istringstream iss;
std::string line;
bool has_data = true;
// we only support single-lined statement.
for (int line_num = 1; ReadOneLine(&iss, &sf_reader, &line, &has_data, &s);
++line_num) {
if (!s.ok()) {
return s;
}
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 = 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
s = GetTableFactoryFromMap(
config_options,
section_title.substr(
opt_section_titles[kOptionSectionTableOptions].size()),
opt_map, &(cf_opt->table_factory));
if (!s.ok()) {
return s;
}
} 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, 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;
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 ",
ToString(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*/) {
for (const auto& pair : db_options_type_info) {
const auto& opt_info = pair.second;
if (config_options.IsCheckEnabled(opt_info.GetSanityLevel())) {
const char* base_addr =
reinterpret_cast<const char*>(&base_opt) + opt_info.offset;
const char* file_addr =
reinterpret_cast<const char*>(&file_opt) + opt_info.offset;
std::string mismatch;
if (!opt_info.MatchesOption(config_options, pair.first, base_addr,
file_addr, &mismatch) &&
!opt_info.MatchesByName(config_options, pair.first, base_addr,
file_addr)) {
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 ColumnFamilyOptions::%s",
pair.first.c_str());
Status s = opt_info.SerializeOption(config_options, pair.first,
base_addr, &base_value);
if (s.ok()) {
s = opt_info.SerializeOption(config_options, pair.first, file_addr,
&file_value);
}
snprintf(buffer, sizeof(buffer),
"[RocksDBOptionsParser]: "
"failed the verification on DBOptions::%s --- "
"The specified one is %s while the persisted one is %s.\n",
pair.first.c_str(), base_value.c_str(), file_value.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, 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) {
for (const auto& pair : cf_options_type_info) {
const auto& opt_info = pair.second;
if (config_options.IsCheckEnabled(opt_info.GetSanityLevel())) {
std::string mismatch;
const char* base_addr =
reinterpret_cast<const char*>(&base_opt) + opt_info.offset;
const char* file_addr =
reinterpret_cast<const char*>(&file_opt) + opt_info.offset;
bool matches = opt_info.MatchesOption(config_options, pair.first,
base_addr, file_addr, &mismatch);
if (!matches && opt_info.IsByName()) {
if (opt_map == nullptr) {
matches = true;
} else {
auto iter = opt_map->find(pair.first);
if (iter == opt_map->end()) {
matches = true;
} else {
matches = opt_info.MatchesByName(config_options, pair.first,
base_addr, iter->second);
}
}
}
if (!matches) {
// The options do not match
const size_t kBufferSize = 2048;
char buffer[kBufferSize];
std::string base_value;
std::string file_value;
Status s = opt_info.SerializeOption(config_options, pair.first,
base_addr, &base_value);
if (s.ok()) {
s = opt_info.SerializeOption(config_options, pair.first, file_addr,
&file_value);
}
int offset =
snprintf(buffer, sizeof(buffer),
"[RocksDBOptionsParser]: "
"failed the verification on ColumnFamilyOptions::%s",
pair.first.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)));
} // if (! matches)
} // CheckSanityLevel
} // For each option
return Status::OK();
}
Status RocksDBOptionsParser::VerifyTableFactory(
const ConfigOptions& config_options, const TableFactory* base_tf,
const TableFactory* file_tf) {
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()");
}
if (base_tf->Name() == BlockBasedTableFactory::kName) {
return VerifyBlockBasedTableFactory(
config_options,
static_cast_with_check<const BlockBasedTableFactory,
const TableFactory>(base_tf),
static_cast_with_check<const BlockBasedTableFactory,
const TableFactory>(file_tf));
}
// TODO(yhchiang): add checks for other table factory types
} else {
// TODO(yhchiang): further support sanity check here
}
return Status::OK();
}
} // namespace ROCKSDB_NAMESPACE
#endif // !ROCKSDB_LITE
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