Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * worker_internal.h
4 : * Internal headers shared by logical replication workers.
5 : *
6 : * Portions Copyright (c) 2016-2024, PostgreSQL Global Development Group
7 : *
8 : * src/include/replication/worker_internal.h
9 : *
10 : *-------------------------------------------------------------------------
11 : */
12 : #ifndef WORKER_INTERNAL_H
13 : #define WORKER_INTERNAL_H
14 :
15 : #include "access/xlogdefs.h"
16 : #include "catalog/pg_subscription.h"
17 : #include "datatype/timestamp.h"
18 : #include "miscadmin.h"
19 : #include "replication/logicalrelation.h"
20 : #include "replication/walreceiver.h"
21 : #include "storage/buffile.h"
22 : #include "storage/fileset.h"
23 : #include "storage/lock.h"
24 : #include "storage/shm_mq.h"
25 : #include "storage/shm_toc.h"
26 : #include "storage/spin.h"
27 :
28 : /* Different types of worker */
29 : typedef enum LogicalRepWorkerType
30 : {
31 : WORKERTYPE_UNKNOWN = 0,
32 : WORKERTYPE_TABLESYNC,
33 : WORKERTYPE_APPLY,
34 : WORKERTYPE_PARALLEL_APPLY,
35 : } LogicalRepWorkerType;
36 :
37 : typedef struct LogicalRepWorker
38 : {
39 : /* What type of worker is this? */
40 : LogicalRepWorkerType type;
41 :
42 : /* Time at which this worker was launched. */
43 : TimestampTz launch_time;
44 :
45 : /* Indicates if this slot is used or free. */
46 : bool in_use;
47 :
48 : /* Increased every time the slot is taken by new worker. */
49 : uint16 generation;
50 :
51 : /* Pointer to proc array. NULL if not running. */
52 : PGPROC *proc;
53 :
54 : /* Database id to connect to. */
55 : Oid dbid;
56 :
57 : /* User to use for connection (will be same as owner of subscription). */
58 : Oid userid;
59 :
60 : /* Subscription id for the worker. */
61 : Oid subid;
62 :
63 : /* Used for initial table synchronization. */
64 : Oid relid;
65 : char relstate;
66 : XLogRecPtr relstate_lsn;
67 : slock_t relmutex;
68 :
69 : /*
70 : * Used to create the changes and subxact files for the streaming
71 : * transactions. Upon the arrival of the first streaming transaction or
72 : * when the first-time leader apply worker times out while sending changes
73 : * to the parallel apply worker, the fileset will be initialized, and it
74 : * will be deleted when the worker exits. Under this, separate buffiles
75 : * would be created for each transaction which will be deleted after the
76 : * transaction is finished.
77 : */
78 : FileSet *stream_fileset;
79 :
80 : /*
81 : * PID of leader apply worker if this slot is used for a parallel apply
82 : * worker, InvalidPid otherwise.
83 : */
84 : pid_t leader_pid;
85 :
86 : /* Indicates whether apply can be performed in parallel. */
87 : bool parallel_apply;
88 :
89 : /* Stats. */
90 : XLogRecPtr last_lsn;
91 : TimestampTz last_send_time;
92 : TimestampTz last_recv_time;
93 : XLogRecPtr reply_lsn;
94 : TimestampTz reply_time;
95 : } LogicalRepWorker;
96 :
97 : /*
98 : * State of the transaction in parallel apply worker.
99 : *
100 : * The enum values must have the same order as the transaction state
101 : * transitions.
102 : */
103 : typedef enum ParallelTransState
104 : {
105 : PARALLEL_TRANS_UNKNOWN,
106 : PARALLEL_TRANS_STARTED,
107 : PARALLEL_TRANS_FINISHED,
108 : } ParallelTransState;
109 :
110 : /*
111 : * State of fileset used to communicate changes from leader to parallel
112 : * apply worker.
113 : *
114 : * FS_EMPTY indicates an initial state where the leader doesn't need to use
115 : * the file to communicate with the parallel apply worker.
116 : *
117 : * FS_SERIALIZE_IN_PROGRESS indicates that the leader is serializing changes
118 : * to the file.
119 : *
120 : * FS_SERIALIZE_DONE indicates that the leader has serialized all changes to
121 : * the file.
122 : *
123 : * FS_READY indicates that it is now ok for a parallel apply worker to
124 : * read the file.
125 : */
126 : typedef enum PartialFileSetState
127 : {
128 : FS_EMPTY,
129 : FS_SERIALIZE_IN_PROGRESS,
130 : FS_SERIALIZE_DONE,
131 : FS_READY,
132 : } PartialFileSetState;
133 :
134 : /*
135 : * Struct for sharing information between leader apply worker and parallel
136 : * apply workers.
137 : */
138 : typedef struct ParallelApplyWorkerShared
139 : {
140 : slock_t mutex;
141 :
142 : TransactionId xid;
143 :
144 : /*
145 : * State used to ensure commit ordering.
146 : *
147 : * The parallel apply worker will set it to PARALLEL_TRANS_FINISHED after
148 : * handling the transaction finish commands while the apply leader will
149 : * wait for it to become PARALLEL_TRANS_FINISHED before proceeding in
150 : * transaction finish commands (e.g. STREAM_COMMIT/STREAM_PREPARE/
151 : * STREAM_ABORT).
152 : */
153 : ParallelTransState xact_state;
154 :
155 : /* Information from the corresponding LogicalRepWorker slot. */
156 : uint16 logicalrep_worker_generation;
157 : int logicalrep_worker_slot_no;
158 :
159 : /*
160 : * Indicates whether there are pending streaming blocks in the queue. The
161 : * parallel apply worker will check it before starting to wait.
162 : */
163 : pg_atomic_uint32 pending_stream_count;
164 :
165 : /*
166 : * XactLastCommitEnd from the parallel apply worker. This is required by
167 : * the leader worker so it can update the lsn_mappings.
168 : */
169 : XLogRecPtr last_commit_end;
170 :
171 : /*
172 : * After entering PARTIAL_SERIALIZE mode, the leader apply worker will
173 : * serialize changes to the file, and share the fileset with the parallel
174 : * apply worker when processing the transaction finish command. Then the
175 : * parallel apply worker will apply all the spooled messages.
176 : *
177 : * FileSet is used here instead of SharedFileSet because we need it to
178 : * survive after releasing the shared memory so that the leader apply
179 : * worker can re-use the same fileset for the next streaming transaction.
180 : */
181 : PartialFileSetState fileset_state;
182 : FileSet fileset;
183 : } ParallelApplyWorkerShared;
184 :
185 : /*
186 : * Information which is used to manage the parallel apply worker.
187 : */
188 : typedef struct ParallelApplyWorkerInfo
189 : {
190 : /*
191 : * This queue is used to send changes from the leader apply worker to the
192 : * parallel apply worker.
193 : */
194 : shm_mq_handle *mq_handle;
195 :
196 : /*
197 : * This queue is used to transfer error messages from the parallel apply
198 : * worker to the leader apply worker.
199 : */
200 : shm_mq_handle *error_mq_handle;
201 :
202 : dsm_segment *dsm_seg;
203 :
204 : /*
205 : * Indicates whether the leader apply worker needs to serialize the
206 : * remaining changes to a file due to timeout when attempting to send data
207 : * to the parallel apply worker via shared memory.
208 : */
209 : bool serialize_changes;
210 :
211 : /*
212 : * True if the worker is being used to process a parallel apply
213 : * transaction. False indicates this worker is available for re-use.
214 : */
215 : bool in_use;
216 :
217 : ParallelApplyWorkerShared *shared;
218 : } ParallelApplyWorkerInfo;
219 :
220 : /* Main memory context for apply worker. Permanent during worker lifetime. */
221 : extern PGDLLIMPORT MemoryContext ApplyContext;
222 :
223 : extern PGDLLIMPORT MemoryContext ApplyMessageContext;
224 :
225 : extern PGDLLIMPORT ErrorContextCallback *apply_error_context_stack;
226 :
227 : extern PGDLLIMPORT ParallelApplyWorkerShared *MyParallelShared;
228 :
229 : /* libpqreceiver connection */
230 : extern PGDLLIMPORT struct WalReceiverConn *LogRepWorkerWalRcvConn;
231 :
232 : /* Worker and subscription objects. */
233 : extern PGDLLIMPORT Subscription *MySubscription;
234 : extern PGDLLIMPORT LogicalRepWorker *MyLogicalRepWorker;
235 :
236 : extern PGDLLIMPORT bool in_remote_transaction;
237 :
238 : extern PGDLLIMPORT bool InitializingApplyWorker;
239 :
240 : extern void logicalrep_worker_attach(int slot);
241 : extern LogicalRepWorker *logicalrep_worker_find(Oid subid, Oid relid,
242 : bool only_running);
243 : extern List *logicalrep_workers_find(Oid subid, bool only_running);
244 : extern bool logicalrep_worker_launch(LogicalRepWorkerType wtype,
245 : Oid dbid, Oid subid, const char *subname,
246 : Oid userid, Oid relid,
247 : dsm_handle subworker_dsm);
248 : extern void logicalrep_worker_stop(Oid subid, Oid relid);
249 : extern void logicalrep_pa_worker_stop(ParallelApplyWorkerInfo *winfo);
250 : extern void logicalrep_worker_wakeup(Oid subid, Oid relid);
251 : extern void logicalrep_worker_wakeup_ptr(LogicalRepWorker *worker);
252 :
253 : extern int logicalrep_sync_worker_count(Oid subid);
254 :
255 : extern void ReplicationOriginNameForLogicalRep(Oid suboid, Oid relid,
256 : char *originname, Size szoriginname);
257 :
258 : extern bool AllTablesyncsReady(void);
259 : extern void UpdateTwoPhaseState(Oid suboid, char new_state);
260 :
261 : extern void process_syncing_tables(XLogRecPtr current_lsn);
262 : extern void invalidate_syncing_table_states(Datum arg, int cacheid,
263 : uint32 hashvalue);
264 :
265 : extern void stream_start_internal(TransactionId xid, bool first_segment);
266 : extern void stream_stop_internal(TransactionId xid);
267 :
268 : /* Common streaming function to apply all the spooled messages */
269 : extern void apply_spooled_messages(FileSet *stream_fileset, TransactionId xid,
270 : XLogRecPtr lsn);
271 :
272 : extern void apply_dispatch(StringInfo s);
273 :
274 : extern void maybe_reread_subscription(void);
275 :
276 : extern void stream_cleanup_files(Oid subid, TransactionId xid);
277 :
278 : extern void set_stream_options(WalRcvStreamOptions *options,
279 : char *slotname,
280 : XLogRecPtr *origin_startpos);
281 :
282 : extern void start_apply(XLogRecPtr origin_startpos);
283 :
284 : extern void InitializeLogRepWorker(void);
285 :
286 : extern void SetupApplyOrSyncWorker(int worker_slot);
287 :
288 : extern void DisableSubscriptionAndExit(void);
289 :
290 : extern void store_flush_position(XLogRecPtr remote_lsn, XLogRecPtr local_lsn);
291 :
292 : /* Function for apply error callback */
293 : extern void apply_error_callback(void *arg);
294 : extern void set_apply_error_context_origin(char *originname);
295 :
296 : /* Parallel apply worker setup and interactions */
297 : extern void pa_allocate_worker(TransactionId xid);
298 : extern ParallelApplyWorkerInfo *pa_find_worker(TransactionId xid);
299 : extern void pa_detach_all_error_mq(void);
300 :
301 : extern bool pa_send_data(ParallelApplyWorkerInfo *winfo, Size nbytes,
302 : const void *data);
303 : extern void pa_switch_to_partial_serialize(ParallelApplyWorkerInfo *winfo,
304 : bool stream_locked);
305 :
306 : extern void pa_set_xact_state(ParallelApplyWorkerShared *wshared,
307 : ParallelTransState xact_state);
308 : extern void pa_set_stream_apply_worker(ParallelApplyWorkerInfo *winfo);
309 :
310 : extern void pa_start_subtrans(TransactionId current_xid,
311 : TransactionId top_xid);
312 : extern void pa_reset_subtrans(void);
313 : extern void pa_stream_abort(LogicalRepStreamAbortData *abort_data);
314 : extern void pa_set_fileset_state(ParallelApplyWorkerShared *wshared,
315 : PartialFileSetState fileset_state);
316 :
317 : extern void pa_lock_stream(TransactionId xid, LOCKMODE lockmode);
318 : extern void pa_unlock_stream(TransactionId xid, LOCKMODE lockmode);
319 :
320 : extern void pa_lock_transaction(TransactionId xid, LOCKMODE lockmode);
321 : extern void pa_unlock_transaction(TransactionId xid, LOCKMODE lockmode);
322 :
323 : extern void pa_decr_and_wait_stream_block(void);
324 :
325 : extern void pa_xact_finish(ParallelApplyWorkerInfo *winfo,
326 : XLogRecPtr remote_lsn);
327 :
328 : #define isParallelApplyWorker(worker) ((worker)->in_use && \
329 : (worker)->type == WORKERTYPE_PARALLEL_APPLY)
330 : #define isTablesyncWorker(worker) ((worker)->in_use && \
331 : (worker)->type == WORKERTYPE_TABLESYNC)
332 :
333 : static inline bool
334 882 : am_tablesync_worker(void)
335 : {
336 882 : return isTablesyncWorker(MyLogicalRepWorker);
337 : }
338 :
339 : static inline bool
340 972 : am_leader_apply_worker(void)
341 : {
342 : Assert(MyLogicalRepWorker->in_use);
343 972 : return (MyLogicalRepWorker->type == WORKERTYPE_APPLY);
344 : }
345 :
346 : static inline bool
347 654940 : am_parallel_apply_worker(void)
348 : {
349 : Assert(MyLogicalRepWorker->in_use);
350 654940 : return isParallelApplyWorker(MyLogicalRepWorker);
351 : }
352 :
353 : #endif /* WORKER_INTERNAL_H */
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