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Exit from base backups when shutdown is requested 

When the exit waits until the whole backup completes, it may take
a very long time.

In passing, add back an error check in the main loop so we detect
clients that disconnect much earlier if the backup is large.
This commit is contained in:
Magnus Hagander 2011-01-14 12:36:45 +01:00
parent 52948169bc
commit 688423d004
3 changed files with 23 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/backend/replication/basebackup.c
View File

@ -308,6 +308,15 @@ sendDir(char *path, int basepathlen, bool sizeonly)
strlen(PG_TEMP_FILE_PREFIX)) == 0)
continue;
/*
* Check if the postmaster has signaled us to exit, and abort
* with an error in that case. The error handler further up
* will call do_pg_abort_backup() for us.
*/
if (walsender_shutdown_requested || walsender_ready_to_stop)
ereport(ERROR,
(errmsg("shutdown requested, aborting active base backup")));
snprintf(pathbuf, MAXPGPATH, "%s/%s", path, de->d_name);
/* Skip postmaster.pid in the data directory */
@ -462,7 +471,10 @@ sendFile(char *filename, int basepathlen, struct stat * statbuf)
while ((cnt = fread(buf, 1, Min(sizeof(buf), statbuf->st_size - len), fp)) > 0)
{
/* Send the chunk as a CopyData message */
pq_putmessage('d', buf, cnt);
if (pq_putmessage('d', buf, cnt))
ereport(ERROR,
(errmsg("base backup could not send data, aborting backup")));
len += cnt;
if (len >= statbuf->st_size)

16
src/backend/replication/walsender.c
View File

@ -88,8 +88,8 @@ static XLogRecPtr sentPtr = {0, 0};
/* Flags set by signal handlers for later service in main loop */
static volatile sig_atomic_t got_SIGHUP = false;
static volatile sig_atomic_t shutdown_requested = false;
static volatile sig_atomic_t ready_to_stop = false;
volatile sig_atomic_t walsender_shutdown_requested = false;
volatile sig_atomic_t walsender_ready_to_stop = false;
/* Signal handlers */
static void WalSndSigHupHandler(SIGNAL_ARGS);
@ -426,16 +426,16 @@ WalSndLoop(void)
* When SIGUSR2 arrives, we send all outstanding logs up to the
* shutdown checkpoint record (i.e., the latest record) and exit.
*/
if (ready_to_stop)
if (walsender_ready_to_stop)
{
if (!XLogSend(output_message, &caughtup))
break;
if (caughtup)
shutdown_requested = true;
walsender_shutdown_requested = true;
}
/* Normal exit from the walsender is here */
if (shutdown_requested)
if (walsender_shutdown_requested)
{
/* Inform the standby that XLOG streaming was done */
pq_puttextmessage('C', "COPY 0");
@ -461,7 +461,7 @@ WalSndLoop(void)
if (!XLogSend(output_message, &caughtup))
break;
if (caughtup && !got_SIGHUP && !ready_to_stop && !shutdown_requested)
if (caughtup && !got_SIGHUP && !walsender_ready_to_stop && !walsender_shutdown_requested)
{
/*
* XXX: We don't really need the periodic wakeups anymore,
@ -841,7 +841,7 @@ WalSndSigHupHandler(SIGNAL_ARGS)
static void
WalSndShutdownHandler(SIGNAL_ARGS)
{
shutdown_requested = true;
walsender_shutdown_requested = true;
if (MyWalSnd)
SetLatch(&MyWalSnd->latch);
}
@ -889,7 +889,7 @@ WalSndXLogSendHandler(SIGNAL_ARGS)
static void
WalSndLastCycleHandler(SIGNAL_ARGS)
{
ready_to_stop = true;
walsender_ready_to_stop = true;
if (MyWalSnd)
SetLatch(&MyWalSnd->latch);
}

2
src/include/replication/walsender.h
View File

@ -53,6 +53,8 @@ extern WalSndCtlData *WalSndCtl;
/* global state */
extern bool am_walsender;
extern volatile sig_atomic_t walsender_shutdown_requested;
extern volatile sig_atomic_t walsender_ready_to_stop;
/* user-settable parameters */
extern int WalSndDelay;