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rocksdb/util/ldb_cmd.cc

300 lines
8.2 KiB

// Copyright (c) 2012 Facebook. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "util/ldb_cmd.h"
namespace leveldb {
const char* LDBCommand::FROM_ARG = "--from=";
const char* LDBCommand::END_ARG = "--to=";
const char* LDBCommand::HEX_ARG = "--hex";
Compactor::Compactor(std::string& db_name, std::vector<std::string>& args) :
LDBCommand(db_name, args), null_from_(true), null_to_(true), hex_(false) {
for (unsigned int i = 0; i < args.size(); i++) {
std::string& arg = args.at(i);
if (arg.find(FROM_ARG) == 0) {
null_from_ = false;
from_ = arg.substr(strlen(FROM_ARG));
} else if (arg.find(END_ARG) == 0) {
null_to_ = false;
to_ = arg.substr(strlen(END_ARG));
} else if (arg.find(HEX_ARG) == 0) {
hex_ = true;
} else {
exec_state_ = LDBCommandExecuteResult::FAILED("Unknown argument." + arg);
}
}
if (hex_) {
if (!null_from_) {
from_ = HexToString(from_);
}
if (!null_to_) {
to_ = HexToString(to_);
}
}
}
void Compactor::Help(std::string& ret) {
LDBCommand::Help(ret);
ret.append("[--from=START KEY] ");
ret.append("[--to=START KEY] ");
ret.append("[--hex] ");
}
void Compactor::DoCommand() {
leveldb::Slice* begin = NULL;
leveldb::Slice* end = NULL;
if (!null_from_) {
begin = new leveldb::Slice(from_);
}
if (!null_to_) {
end = new leveldb::Slice(to_);
}
db_->CompactRange(begin, end);
exec_state_ = LDBCommandExecuteResult::SUCCEED("");
delete begin;
delete end;
}
const char* DBDumper::MAX_KEYS_ARG = "--max_keys=";
const char* DBDumper::COUNT_ONLY_ARG = "--count_only";
const char* DBDumper::STATS_ARG = "--stats";
const char* DBDumper::HEX_OUTPUT_ARG = "--output_hex";
DBDumper::DBDumper(std::string& db_name, std::vector<std::string>& args) :
LDBCommand(db_name, args),
null_from_(true),
null_to_(true),
max_keys_(-1),
count_only_(false),
print_stats_(false),
hex_(false),
hex_output_(false) {
for (unsigned int i = 0; i < args.size(); i++) {
std::string& arg = args.at(i);
if (arg.find(FROM_ARG) == 0) {
null_from_ = false;
from_ = arg.substr(strlen(FROM_ARG));
} else if (arg.find(END_ARG) == 0) {
null_to_ = false;
to_ = arg.substr(strlen(END_ARG));
} else if (arg.find(HEX_ARG) == 0) {
hex_ = true;
} else if (arg.find(MAX_KEYS_ARG) == 0) {
max_keys_ = atoi(arg.substr(strlen(MAX_KEYS_ARG)).c_str());
} else if (arg.find(STATS_ARG) == 0) {
print_stats_ = true;
} else if (arg.find(COUNT_ONLY_ARG) == 0) {
count_only_ = true;
} else if (arg.find(HEX_OUTPUT_ARG) == 0) {
hex_output_ = true;
} else {
exec_state_ = LDBCommandExecuteResult::FAILED("Unknown argument:" + arg);
}
}
if (hex_) {
if (!null_from_) {
from_ = HexToString(from_);
}
if (!null_to_) {
to_ = HexToString(to_);
}
}
}
void DBDumper::Help(std::string& ret) {
LDBCommand::Help(ret);
ret.append("[--from=START KEY] ");
ret.append("[--to=END Key] ");
ret.append("[--hex] ");
ret.append("[--output_hex] ");
ret.append("[--max_keys=NUM] ");
ret.append("[--count_only] ");
ret.append("[--stats] ");
}
void DBDumper::DoCommand() {
// Parse command line args
uint64_t count = 0;
if (print_stats_) {
std::string stats;
if (db_->GetProperty("leveldb.stats", &stats)) {
fprintf(stdout, "%s\n", stats.c_str());
}
}
// Setup key iterator
leveldb::Iterator* iter = db_->NewIterator(leveldb::ReadOptions());
leveldb::Status st = iter->status();
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED("Iterator error."
+ st.ToString());
}
if (!null_from_) {
iter->Seek(from_);
} else {
iter->SeekToFirst();
}
int max_keys = max_keys_;
for (; iter->Valid(); iter->Next()) {
// If end marker was specified, we stop before it
if (!null_to_ && (iter->key().ToString() >= to_))
break;
// Terminate if maximum number of keys have been dumped
if (max_keys == 0)
break;
if (max_keys > 0) {
--max_keys;
}
++count;
if (!count_only_) {
if (hex_output_) {
std::string str = iter->key().ToString();
for (unsigned int i = 0; i < str.length(); ++i) {
fprintf(stdout, "%X", str[i]);
}
fprintf(stdout, " ==> ");
str = iter->value().ToString();
for (unsigned int i = 0; i < str.length(); ++i) {
fprintf(stdout, "%X", str[i]);
}
fprintf(stdout, "\n");
} else {
fprintf(stdout, "%s ==> %s\n", iter->key().ToString().c_str(),
iter->value().ToString().c_str());
}
}
}
fprintf(stdout, "Keys in range: %lld\n", (long long) count);
// Clean up
delete iter;
}
const char* ReduceDBLevels::NEW_LEVLES_ARG = "--new_levels=";
const char* ReduceDBLevels::PRINT_OLD_LEVELS_ARG = "--print_old_levels";
ReduceDBLevels::ReduceDBLevels(std::string& db_name,
std::vector<std::string>& args)
: LDBCommand(db_name, args),
new_levels_(-1),
print_old_levels_(false) {
for (unsigned int i = 0; i < args.size(); i++) {
std::string& arg = args.at(i);
if (arg.find(NEW_LEVLES_ARG) == 0) {
new_levels_ = atoi(arg.substr(strlen(NEW_LEVLES_ARG)).c_str());
} else if (arg.find(PRINT_OLD_LEVELS_ARG) == 0) {
print_old_levels_ = true;
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(
"Unknown argument." + arg);
}
}
if(new_levels_ <= 0) {
exec_state_ = LDBCommandExecuteResult::FAILED(
" Use --new_levels to specify a new level number\n");
}
}
std::vector<std::string> ReduceDBLevels::PrepareArgs(int new_levels,
bool print_old_level) {
std::vector<std::string> ret;
char arg[100];
sprintf(arg, "%s%d", NEW_LEVLES_ARG, new_levels);
ret.push_back(arg);
if(print_old_level) {
sprintf(arg, "%s", PRINT_OLD_LEVELS_ARG);
ret.push_back(arg);
}
return ret;
}
void ReduceDBLevels::Help(std::string& msg) {
LDBCommand::Help(msg);
msg.append("[--new_levels=New number of levels] ");
msg.append("[--print_old_levels] ");
}
leveldb::Options ReduceDBLevels::PrepareOptionsForOpenDB() {
leveldb::Options opt = LDBCommand::PrepareOptionsForOpenDB();
// Set to a big value to make sure we can open the db
opt.num_levels = 1 << 16;
return opt;
}
void ReduceDBLevels::DoCommand() {
if (new_levels_ <= 1) {
exec_state_ = LDBCommandExecuteResult::FAILED(
"Invalid number of levels.\n");
return;
}
leveldb::Status st;
leveldb::Options opt = PrepareOptionsForOpenDB();
if (print_old_levels_) {
TableCache* tc = new TableCache(db_path_, &opt, 10);
const InternalKeyComparator* cmp = new InternalKeyComparator(
opt.comparator);
VersionSet* versions = new VersionSet(db_path_, &opt,
tc, cmp);
// We rely the VersionSet::Recover to tell us the internal data structures
// in the db. And the Recover() should never do any change
// (like LogAndApply) to the manifest file.
st = versions->Recover();
int max = -1;
for(int i = 0; i<versions->NumberLevels(); i++) {
if (versions->NumLevelFiles(i)) {
max = i;
}
}
fprintf(stdout, "The old number of levels in use is %d\n", max + 1);
delete versions;
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
return;
}
}
// Compact the whole DB to put all files to the highest level.
db_->CompactRange(NULL, NULL);
CloseDB();
TableCache* tc = new TableCache(db_path_, &opt, 10);
const InternalKeyComparator* cmp = new InternalKeyComparator(
opt.comparator);
VersionSet* versions = new VersionSet(db_path_, &opt,
tc, cmp);
// We rely the VersionSet::Recover to tell us the internal data structures
// in the db. And the Recover() should never do any change (like LogAndApply)
// to the manifest file.
st = versions->Recover();
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
return;
}
port::Mutex mu;
mu.Lock();
st = versions->ReduceNumberOfLevels(new_levels_, &mu);
mu.Unlock();
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
return;
}
}
}