4bf25357ae
Summary: Instead of VersionSet::current(), DBImpl uses default_cfd_->current directly. Test Plan: make check Reviewers: dhruba, haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D15483
105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
//
|
|
// 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 "db/db_impl_readonly.h"
|
|
#include "db/db_impl.h"
|
|
|
|
#include <algorithm>
|
|
#include <set>
|
|
#include <string>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <vector>
|
|
#include <algorithm>
|
|
#include "db/db_iter.h"
|
|
#include "db/dbformat.h"
|
|
#include "db/filename.h"
|
|
#include "db/log_reader.h"
|
|
#include "db/log_writer.h"
|
|
#include "db/memtable.h"
|
|
#include "db/merge_context.h"
|
|
#include "db/table_cache.h"
|
|
#include "db/version_set.h"
|
|
#include "db/write_batch_internal.h"
|
|
#include "rocksdb/db.h"
|
|
#include "rocksdb/env.h"
|
|
#include "rocksdb/status.h"
|
|
#include "rocksdb/table.h"
|
|
#include "rocksdb/merge_operator.h"
|
|
#include "port/port.h"
|
|
#include "table/block.h"
|
|
#include "table/merger.h"
|
|
#include "table/two_level_iterator.h"
|
|
#include "util/coding.h"
|
|
#include "util/logging.h"
|
|
#include "util/build_version.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
DBImplReadOnly::DBImplReadOnly(const Options& options,
|
|
const std::string& dbname)
|
|
: DBImpl(options, dbname) {
|
|
Log(options_.info_log, "Opening the db in read only mode");
|
|
}
|
|
|
|
DBImplReadOnly::~DBImplReadOnly() {
|
|
}
|
|
|
|
// Implementations of the DB interface
|
|
Status DBImplReadOnly::Get(const ReadOptions& options,
|
|
const ColumnFamilyHandle& column_family,
|
|
const Slice& key, std::string* value) {
|
|
Status s;
|
|
MemTable* mem = GetDefaultColumnFamily()->mem;
|
|
Version* current = GetDefaultColumnFamily()->current;
|
|
SequenceNumber snapshot = versions_->LastSequence();
|
|
MergeContext merge_context;
|
|
LookupKey lkey(key, snapshot);
|
|
if (mem->Get(lkey, value, &s, merge_context, options_)) {
|
|
} else {
|
|
Version::GetStats stats;
|
|
current->Get(options, lkey, value, &s, &merge_context, &stats, options_);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Iterator* DBImplReadOnly::NewIterator(const ReadOptions& options) {
|
|
SequenceNumber latest_snapshot;
|
|
Iterator* internal_iter = NewInternalIterator(options, &latest_snapshot);
|
|
return NewDBIterator(
|
|
&dbname_, env_, options_, user_comparator(),internal_iter,
|
|
(options.snapshot != nullptr
|
|
? reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_
|
|
: latest_snapshot));
|
|
}
|
|
|
|
Status DB::OpenForReadOnly(const Options& options, const std::string& dbname,
|
|
DB** dbptr, bool error_if_log_file_exist) {
|
|
*dbptr = nullptr;
|
|
|
|
DBImplReadOnly* impl = new DBImplReadOnly(options, dbname);
|
|
impl->mutex_.Lock();
|
|
DBOptions db_options(options);
|
|
ColumnFamilyOptions cf_options(options);
|
|
std::vector<ColumnFamilyDescriptor> column_families;
|
|
column_families.push_back(
|
|
ColumnFamilyDescriptor(default_column_family_name, cf_options));
|
|
Status s = impl->Recover(column_families, true /* read only */,
|
|
error_if_log_file_exist);
|
|
impl->mutex_.Unlock();
|
|
if (s.ok()) {
|
|
*dbptr = impl;
|
|
} else {
|
|
delete impl;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
}
|