9b50106f9a
Summary: Create a new type of file on startup if it doesn't already exist called DBID. This will store a unique number generated from boost library's uuid header file. The use-case is to identify the case of a db losing all its data and coming back up either empty or from an image(backup/live replica's recovery) the key point to note is that DBID is not stored in a backup or db snapshot It's preferable to use Boost for uuid because: 1) A non-standard way of generating uuid is not good 2) /proc/sys/kernel/random/uuid generates a uuid but only on linux environments and the solution would not be clean 3) c++ doesn't have any direct way to get a uuid 4) Boost is a very good library that was already having linkage in rocksdb from third-party Note: I had to update the TOOLCHAIN_REV in build files to get latest verison of boost from third-party as the older version had a bug. I had to put Wno-uninitialized in Makefile because boost-1.51 has an unitialized variable and rocksdb would not comiple otherwise. Latet open-source for boost is 1.54 but is not there in third-party. I have notified the concerned people in fbcode about it. @kailiu : While releasing to third-party, an additional dependency will need to be created for boost in TARGETS file. I can help identify. Test Plan: Expand db_test to test 2 cases 1) Restarting db with Id file present - verify that no change to Id 2)Restarting db with Id file deleted - verify that a different Id is there after reopen Also run make all check Reviewers: dhruba, haobo, kailiu, sdong Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D13587
107 lines
4.0 KiB
C++
107 lines
4.0 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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// File names used by DB code
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#pragma once
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#include <stdint.h>
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#include <string>
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#include "rocksdb/slice.h"
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#include "rocksdb/status.h"
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#include "port/port.h"
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namespace rocksdb {
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class Env;
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enum FileType {
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kLogFile,
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kDBLockFile,
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kTableFile,
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kDescriptorFile,
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kCurrentFile,
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kTempFile,
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kInfoLogFile, // Either the current one, or an old one
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kMetaDatabase,
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kIdentityFile
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};
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// Return the name of the log file with the specified number
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// in the db named by "dbname". The result will be prefixed with
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// "dbname".
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extern std::string LogFileName(const std::string& dbname, uint64_t number);
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static const std::string ARCHIVAL_DIR = "archive";
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extern std::string ArchivalDirectory(const std::string& dbname);
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// Return the name of the archived log file with the specified number
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// in the db named by "dbname". The result will be prefixed with "dbname".
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extern std::string ArchivedLogFileName(const std::string& dbname,
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uint64_t num);
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// Return the name of the sstable with the specified number
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// in the db named by "dbname". The result will be prefixed with
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// "dbname".
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extern std::string TableFileName(const std::string& dbname, uint64_t number);
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// Return the name of the descriptor file for the db named by
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// "dbname" and the specified incarnation number. The result will be
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// prefixed with "dbname".
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extern std::string DescriptorFileName(const std::string& dbname,
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uint64_t number);
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// Return the name of the current file. This file contains the name
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// of the current manifest file. The result will be prefixed with
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// "dbname".
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extern std::string CurrentFileName(const std::string& dbname);
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// Return the name of the lock file for the db named by
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// "dbname". The result will be prefixed with "dbname".
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extern std::string LockFileName(const std::string& dbname);
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// Return the name of a temporary file owned by the db named "dbname".
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// The result will be prefixed with "dbname".
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extern std::string TempFileName(const std::string& dbname, uint64_t number);
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// Return the name of the info log file for "dbname".
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extern std::string InfoLogFileName(const std::string& dbname,
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const std::string& db_path="", const std::string& log_dir="");
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// Return the name of the old info log file for "dbname".
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extern std::string OldInfoLogFileName(const std::string& dbname, uint64_t ts,
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const std::string& db_path="", const std::string& log_dir="");
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// Return the name to use for a metadatabase. The result will be prefixed with
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// "dbname".
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extern std::string MetaDatabaseName(const std::string& dbname,
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uint64_t number);
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// Return the name of the Identity file which stores a unique number for the db
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// that will get regenerated if the db loses all its data and is recreated fresh
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// either from a backup-image or empty
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extern std::string IdentityFileName(const std::string& dbname);
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// If filename is a rocksdb file, store the type of the file in *type.
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// The number encoded in the filename is stored in *number. If the
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// filename was successfully parsed, returns true. Else return false.
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extern bool ParseFileName(const std::string& filename,
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uint64_t* number,
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FileType* type);
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// Make the CURRENT file point to the descriptor file with the
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// specified number.
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extern Status SetCurrentFile(Env* env, const std::string& dbname,
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uint64_t descriptor_number);
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// Make the IDENTITY file for the db
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extern Status SetIdentityFile(Env* env, const std::string& dbname);
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} // namespace rocksdb
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