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Display the leader apply worker's PID for parallel apply workers.

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Add leader_pid to pg_stat_subscription. leader_pid is the process ID of
the leader apply worker if this process is a parallel apply worker. If
this field is NULL, it indicates that the process is a leader apply
worker or a synchronization worker. The new column makes it easier to
distinguish parallel apply workers from other kinds of workers and helps
to identify the leader for the parallel workers corresponding to a
particular subscription.

Additionally, update the leader_pid column in pg_stat_activity as well to
display the PID of the leader apply worker for parallel apply workers.

Author: Hou Zhijie
Reviewed-by: Peter Smith, Sawada Masahiko, Amit Kapila, Shveta Mallik
Discussion: https://postgr.es/m/CAA4eK1+wyN6zpaHUkCLorEWNx75MG0xhMwcFhvjqm2KURZEAGw@mail.gmail.com
This commit is contained in:
Amit Kapila
2023-01-18 09:03:12 +05:30
parent 14bdb3f13d
commit d540a02a72
11 changed files with 106 additions and 44 deletions
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4
src/include/replication/worker_internal.h
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@@ -71,7 +71,7 @@ typedef struct LogicalRepWorker
* PID of leader apply worker if this slot is used for a parallel apply
* worker, InvalidPid otherwise.
*/
pid_t apply_leader_pid;
pid_t leader_pid;
/* Indicates whether apply can be performed in parallel. */
bool parallel_apply;
@@ -303,7 +303,7 @@ extern void pa_decr_and_wait_stream_block(void);
extern void pa_xact_finish(ParallelApplyWorkerInfo *winfo,
XLogRecPtr remote_lsn);
#define isParallelApplyWorker(worker) ((worker)->apply_leader_pid != InvalidPid)
#define isParallelApplyWorker(worker) ((worker)->leader_pid != InvalidPid)
static inline bool
am_tablesync_worker(void)