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Support configuration reload in logical replication workers

Browse Source 
Author: Michael Paquier <michael.paquier@gmail.com>
Reviewed-by: Petr Jelinek <petr.jelinek@2ndquadrant.com>
Reported-by: Fujii Masao <masao.fujii@gmail.com>
This commit is contained in:
Peter Eisentraut 2017-04-10 13:40:55 -04:00
parent c0a8ae7be3
commit 26ad194cb0
3 changed files with 39 additions and 2 deletions
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30
src/backend/replication/logical/launcher.c
View File

@ -75,7 +75,10 @@ LogicalRepCtxStruct *LogicalRepCtx;
static void logicalrep_worker_onexit(int code, Datum arg);
static void logicalrep_worker_detach(void);
bool got_SIGTERM = false;
/* Flags set by signal handlers */
volatile sig_atomic_t got_SIGHUP = false;
volatile sig_atomic_t got_SIGTERM = false;
static bool on_commit_launcher_wakeup = false;
Datum pg_stat_get_subscription(PG_FUNCTION_ARGS);
@ -495,10 +498,28 @@ logicalrep_worker_onexit(int code, Datum arg)
void
logicalrep_worker_sigterm(SIGNAL_ARGS)
{
int save_errno = errno;
got_SIGTERM = true;
/* Waken anything waiting on the process latch */
SetLatch(MyLatch);
errno = save_errno;
}
/* SIGHUP: set flag to reload configuration at next convenient time */
void
logicalrep_worker_sighup(SIGNAL_ARGS)
{
int save_errno = errno;
got_SIGHUP = true;
/* Waken anything waiting on the process latch */
SetLatch(MyLatch);
errno = save_errno;
}
/*
@ -637,6 +658,7 @@ ApplyLauncherMain(Datum main_arg)
(errmsg("logical replication launcher started")));
/* Establish signal handlers. */
pqsignal(SIGHUP, logicalrep_worker_sighup);
pqsignal(SIGTERM, logicalrep_worker_sigterm);
BackgroundWorkerUnblockSignals();
@ -728,6 +750,12 @@ ApplyLauncherMain(Datum main_arg)
if (rc & WL_POSTMASTER_DEATH)
proc_exit(1);
if (got_SIGHUP)
{
got_SIGHUP = false;
ProcessConfigFile(PGC_SIGHUP);
}
ResetLatch(&MyProc->procLatch);
}

7
src/backend/replication/logical/worker.c
View File

@ -1138,6 +1138,12 @@ LogicalRepApplyLoop(XLogRecPtr last_received)
if (rc & WL_POSTMASTER_DEATH)
proc_exit(1);
if (got_SIGHUP)
{
got_SIGHUP = false;
ProcessConfigFile(PGC_SIGHUP);
}
if (rc & WL_TIMEOUT)
{
/*
@ -1441,6 +1447,7 @@ ApplyWorkerMain(Datum main_arg)
logicalrep_worker_attach(worker_slot);
/* Setup signal handling */
pqsignal(SIGHUP, logicalrep_worker_sighup);
pqsignal(SIGTERM, logicalrep_worker_sigterm);
BackgroundWorkerUnblockSignals();

4
src/include/replication/worker_internal.h
View File

@ -56,7 +56,8 @@ extern Subscription *MySubscription;
extern LogicalRepWorker *MyLogicalRepWorker;
extern bool in_remote_transaction;
extern bool got_SIGTERM;
extern volatile sig_atomic_t got_SIGHUP;
extern volatile sig_atomic_t got_SIGTERM;
extern void logicalrep_worker_attach(int slot);
extern LogicalRepWorker *logicalrep_worker_find(Oid subid, Oid relid,
@ -69,6 +70,7 @@ extern void logicalrep_worker_wakeup_ptr(LogicalRepWorker *worker);
extern int logicalrep_sync_worker_count(Oid subid);
extern void logicalrep_worker_sighup(SIGNAL_ARGS);
extern void logicalrep_worker_sigterm(SIGNAL_ARGS);
extern char *LogicalRepSyncTableStart(XLogRecPtr *origin_startpos);
void process_syncing_tables(XLogRecPtr current_lsn);