/Users/deen/code/yugabyte-db/src/yb/fs/fs_manager.h
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1 | | // Licensed to the Apache Software Foundation (ASF) under one |
2 | | // or more contributor license agreements. See the NOTICE file |
3 | | // distributed with this work for additional information |
4 | | // regarding copyright ownership. The ASF licenses this file |
5 | | // to you under the Apache License, Version 2.0 (the |
6 | | // "License"); you may not use this file except in compliance |
7 | | // with the License. You may obtain a copy of the License at |
8 | | // |
9 | | // http://www.apache.org/licenses/LICENSE-2.0 |
10 | | // |
11 | | // Unless required by applicable law or agreed to in writing, |
12 | | // software distributed under the License is distributed on an |
13 | | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
14 | | // KIND, either express or implied. See the License for the |
15 | | // specific language governing permissions and limitations |
16 | | // under the License. |
17 | | // |
18 | | // The following only applies to changes made to this file as part of YugaByte development. |
19 | | // |
20 | | // Portions Copyright (c) YugaByte, Inc. |
21 | | // |
22 | | // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
23 | | // in compliance with the License. You may obtain a copy of the License at |
24 | | // |
25 | | // http://www.apache.org/licenses/LICENSE-2.0 |
26 | | // |
27 | | // Unless required by applicable law or agreed to in writing, software distributed under the License |
28 | | // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
29 | | // or implied. See the License for the specific language governing permissions and limitations |
30 | | // under the License. |
31 | | // |
32 | | |
33 | | #ifndef YB_FS_FS_MANAGER_H |
34 | | #define YB_FS_FS_MANAGER_H |
35 | | |
36 | | #include <iosfwd> |
37 | | #include <memory> |
38 | | #include <set> |
39 | | #include <string> |
40 | | #include <vector> |
41 | | |
42 | | #include <gflags/gflags_declare.h> |
43 | | #include <gtest/gtest_prod.h> |
44 | | |
45 | | #include "yb/gutil/ref_counted.h" |
46 | | #include "yb/util/env.h" |
47 | | #include "yb/util/path_util.h" |
48 | | #include "yb/util/strongly_typed_bool.h" |
49 | | |
50 | | DECLARE_bool(enable_data_block_fsync); |
51 | | |
52 | | namespace google { |
53 | | namespace protobuf { |
54 | | class Message; |
55 | | } // namespace protobuf |
56 | | } // namespace google |
57 | | |
58 | | namespace yb { |
59 | | |
60 | | class MemTracker; |
61 | | class MetricEntity; |
62 | | |
63 | | namespace itest { |
64 | | class ExternalMiniClusterFsInspector; |
65 | | } |
66 | | |
67 | | class InstanceMetadataPB; |
68 | | |
69 | | YB_STRONGLY_TYPED_BOOL(ShouldDeleteLogs); |
70 | | |
71 | | struct FsManagerOpts { |
72 | | FsManagerOpts(); |
73 | | ~FsManagerOpts(); |
74 | | |
75 | | FsManagerOpts(const FsManagerOpts&); |
76 | | FsManagerOpts& operator=(const FsManagerOpts&); |
77 | | |
78 | | // The entity under which all metrics should be grouped. If NULL, metrics |
79 | | // will not be produced. |
80 | | // |
81 | | // Defaults to NULL. |
82 | | scoped_refptr<MetricEntity> metric_entity; |
83 | | |
84 | | // The memory tracker under which all new memory trackers will be parented. |
85 | | // If NULL, new memory trackers will be parented to the root tracker. |
86 | | std::shared_ptr<MemTracker> parent_mem_tracker; |
87 | | |
88 | | // The paths where WALs will be stored. Cannot be empty. |
89 | | std::vector<std::string> wal_paths; |
90 | | |
91 | | // The paths where data blocks will be stored. Cannot be empty. |
92 | | std::vector<std::string> data_paths; |
93 | | |
94 | | // Whether or not read-write operations should be allowed. Defaults to false. |
95 | | bool read_only; |
96 | | |
97 | | // This field is to be used as a path component for all the fs roots. For now, we expect it to be |
98 | | // either master or tserver. |
99 | | std::string server_type; |
100 | | }; |
101 | | |
102 | | // FsManager provides helpers to read data and metadata files, |
103 | | // and it's responsible for abstracting the file-system layout. |
104 | | // |
105 | | // The user should not be aware of where files are placed, |
106 | | // but instead should interact with the storage in terms of "open the file xyz" |
107 | | // or "write a new schema metadata file for table kwz". |
108 | | // |
109 | | // The current top-level dir layout is <yb.root.dir>/yb-data/<server>/. Subdirs under it are: |
110 | | // logs/ |
111 | | // instance |
112 | | // wals/<table>/<tablet> |
113 | | // tablet-meta/<tablet> |
114 | | // data/rocksdb/<table>/<tablet>/ |
115 | | // consensus-meta/<tablet> |
116 | | |
117 | | class FsManager { |
118 | | public: |
119 | | static const char *kWalDirName; |
120 | | static const char *kWalFileNamePrefix; |
121 | | static const char *kWalsRecoveryDirSuffix; |
122 | | static const char *kRocksDBDirName; |
123 | | static const char *kDataDirName; |
124 | | |
125 | | // Only for unit tests. |
126 | | FsManager(Env* env, const std::string& root_path, const std::string& server_type); |
127 | | |
128 | | FsManager(Env* env, const FsManagerOpts& opts); |
129 | | ~FsManager(); |
130 | | |
131 | | // Initialize and load the basic filesystem metadata. |
132 | | // If the file system has not been initialized, returns NotFound. |
133 | | // In that case, CreateInitialFileSystemLayout may be used to initialize |
134 | | // the on-disk structures. |
135 | | CHECKED_STATUS Open(); |
136 | | |
137 | | // |
138 | | // Returns an error if the file system is already initialized. |
139 | | CHECKED_STATUS CreateInitialFileSystemLayout(bool delete_fs_if_lock_found = false); |
140 | | |
141 | | // Deletes the yb-data directory contents for data/wal. "logs" subdirectory deletion is skipped |
142 | | // when 'also_delete_logs' is set to false. |
143 | | // Needed for a master shell process to be stoppable and restartable correctly in shell mode. |
144 | | CHECKED_STATUS DeleteFileSystemLayout( |
145 | | ShouldDeleteLogs also_delete_logs = ShouldDeleteLogs::kFalse); |
146 | | |
147 | | // Check if a lock file is present. |
148 | | bool HasAnyLockFiles(); |
149 | | // Delete the lock files. Used once the caller deems fs creation was succcessful. |
150 | | CHECKED_STATUS DeleteLockFiles(); |
151 | | |
152 | | void DumpFileSystemTree(std::ostream& out); |
153 | | |
154 | | // Return the UUID persisted in the local filesystem. If Open() |
155 | | // has not been called, this will crash. |
156 | | const std::string& uuid() const; |
157 | | |
158 | | // ========================================================================== |
159 | | // on-disk path |
160 | | // ========================================================================== |
161 | | std::set<std::string> GetFsRootDirs() const; |
162 | | |
163 | | std::vector<std::string> GetDataRootDirs() const; |
164 | | |
165 | | std::vector<std::string> GetWalRootDirs() const; |
166 | | |
167 | | // Used for tests only. If GetWalRootDirs returns an empty vector, we will crash the process. |
168 | | std::string GetFirstTabletWalDirOrDie(const std::string& table_id, |
169 | | const std::string& tablet_id) const; |
170 | | |
171 | | static std::string GetTabletWalRecoveryDir(const std::string& tablet_wal_path); |
172 | | |
173 | | static std::string GetWalSegmentFileName(uint64_t sequence_number); |
174 | | |
175 | | static bool IsWalSegmentFileName(const std::string& file_name); |
176 | | |
177 | | static std::string GetWalSegmentFilePath( |
178 | 99.3k | const std::string& wal_path, uint64_t sequence_number) { |
179 | 99.3k | return JoinPathSegments(wal_path, GetWalSegmentFileName(sequence_number)); |
180 | 99.3k | } |
181 | | |
182 | | // Return the directory where Raft group superblocks should be stored. |
183 | | std::string GetRaftGroupMetadataDir() const; |
184 | | static std::string GetRaftGroupMetadataDir(const std::string& data_dir); |
185 | | |
186 | | // Return the path for a specific Raft group's superblock. |
187 | | std::string GetRaftGroupMetadataPath(const std::string& tablet_id) const; |
188 | | |
189 | | // List the tablet IDs in the metadata directory. |
190 | | CHECKED_STATUS ListTabletIds(std::vector<std::string>* tablet_ids); |
191 | | |
192 | | // Return the path where InstanceMetadataPB is stored. |
193 | | std::string GetInstanceMetadataPath(const std::string& root) const; |
194 | | |
195 | | // Return the path where the fs lock file is stored. |
196 | | std::string GetFsLockFilePath(const std::string& root) const; |
197 | | |
198 | | // Return the directory where the consensus metadata is stored. |
199 | | std::string GetConsensusMetadataDir() const; |
200 | | static std::string GetConsensusMetadataDir(const std::string& data_dir); |
201 | | |
202 | | // Return the path where ConsensusMetadataPB is stored. |
203 | 1.00M | std::string GetConsensusMetadataPath(const std::string& tablet_id) const { |
204 | 1.00M | return JoinPathSegments(GetConsensusMetadataDir(), tablet_id); |
205 | 1.00M | } |
206 | | |
207 | 2.32M | Env *env() { return env_; } |
208 | | |
209 | 0 | bool read_only() const { |
210 | 0 | return read_only_; |
211 | 0 | } |
212 | | |
213 | | // ========================================================================== |
214 | | // file-system helpers |
215 | | // ========================================================================== |
216 | 53.4k | bool Exists(const std::string& path) const { |
217 | 53.4k | return env_->FileExists(path); |
218 | 53.4k | } |
219 | | |
220 | | CHECKED_STATUS ListDir(const std::string& path, std::vector<std::string> *objects) const; |
221 | | |
222 | | Result<std::vector<std::string>> ListDir(const std::string& path) const; |
223 | | |
224 | | CHECKED_STATUS CreateDirIfMissing(const std::string& path, bool* created = NULL); |
225 | | |
226 | | CHECKED_STATUS CreateDirIfMissingAndSync(const std::string& path, bool* created = NULL); |
227 | | |
228 | | private: |
229 | | FRIEND_TEST(FsManagerTestBase, TestDuplicatePaths); |
230 | | |
231 | | // Initializes, sanitizes, and canonicalizes the filesystem roots. |
232 | | CHECKED_STATUS Init(); |
233 | | |
234 | | // Creates filesystem roots from 'roots', writing new on-disk |
235 | | // instances using 'metadata'. |
236 | | CHECKED_STATUS CreateFileSystemRoots(const std::set<std::string>& roots, |
237 | | const std::set<std::string>& ancillary_dirs, |
238 | | const InstanceMetadataPB& metadata, |
239 | | bool create_lock = false); |
240 | | |
241 | | std::set<std::string> GetAncillaryDirs(bool add_metadata_dirs) const; |
242 | | |
243 | | // Create a new InstanceMetadataPB. |
244 | | void CreateInstanceMetadata(InstanceMetadataPB* metadata); |
245 | | |
246 | | // Save a InstanceMetadataPB to the filesystem. |
247 | | // Does not mutate the current state of the fsmanager. |
248 | | CHECKED_STATUS WriteInstanceMetadata( |
249 | | const InstanceMetadataPB& metadata, |
250 | | const std::string& path); |
251 | | |
252 | | // Checks if 'path' is an empty directory. |
253 | | // |
254 | | // Returns an error if it's not a directory. Otherwise, sets 'is_empty' |
255 | | // accordingly. |
256 | | CHECKED_STATUS IsDirectoryEmpty(const std::string& path, bool* is_empty); |
257 | | |
258 | | // ========================================================================== |
259 | | // file-system helpers |
260 | | // ========================================================================== |
261 | | void DumpFileSystemTree(std::ostream& out, |
262 | | const std::string& prefix, |
263 | | const std::string& path, |
264 | | const std::vector<std::string>& objects); |
265 | | |
266 | | Env *env_; |
267 | | |
268 | | // If false, operations that mutate on-disk state are prohibited. |
269 | | const bool read_only_; |
270 | | |
271 | | // These roots are the constructor input verbatim. None of them are used |
272 | | // as-is; they are first canonicalized during Init(). |
273 | | const std::vector<std::string> wal_fs_roots_; |
274 | | const std::vector<std::string> data_fs_roots_; |
275 | | const std::string server_type_; |
276 | | |
277 | | scoped_refptr<MetricEntity> metric_entity_; |
278 | | |
279 | | std::shared_ptr<MemTracker> parent_mem_tracker_; |
280 | | |
281 | | // Canonicalized forms of 'wal_fs_roots_ and 'data_fs_roots_'. Constructed |
282 | | // during Init(). |
283 | | // |
284 | | // - The first data root is used as the metadata root. |
285 | | // - Common roots in the collections have been deduplicated. |
286 | | std::set<std::string> canonicalized_wal_fs_roots_; |
287 | | std::string canonicalized_metadata_fs_root_; |
288 | | std::set<std::string> canonicalized_data_fs_roots_; |
289 | | std::set<std::string> canonicalized_all_fs_roots_; |
290 | | |
291 | | std::unique_ptr<InstanceMetadataPB> metadata_; |
292 | | |
293 | | bool initted_; |
294 | | |
295 | | DISALLOW_COPY_AND_ASSIGN(FsManager); |
296 | | }; |
297 | | |
298 | | } // namespace yb |
299 | | |
300 | | #endif // YB_FS_FS_MANAGER_H |