diff options
| -rw-r--r-- | src/backend/postmaster/autovacuum.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c index 3a60d7e7f5a..90dff4b0162 100644 --- a/src/backend/postmaster/autovacuum.c +++ b/src/backend/postmaster/autovacuum.c @@ -129,6 +129,7 @@ int Log_autovacuum_min_duration = -1; /* the minimum allowed time between two awakenings of the launcher */ #define MIN_AUTOVAC_SLEEPTIME 100.0 /* milliseconds */ +#define MAX_AUTOVAC_SLEEPTIME 300 /* seconds */ /* Flags to tell if we are in an autovacuum process */ static bool am_autovacuum_launcher = false; @@ -872,6 +873,15 @@ launcher_determine_sleep(bool canlaunch, bool recursing, struct timeval * nap) nap->tv_sec = 0; nap->tv_usec = MIN_AUTOVAC_SLEEPTIME * 1000; } + + /* + * If the sleep time is too large, clamp it to an arbitrary maximum (plus + * any fractional seconds, for simplicity). This avoids an essentially + * infinite sleep in strange cases like the system clock going backwards a + * few years. + */ + if (nap->tv_sec > MAX_AUTOVAC_SLEEPTIME) + nap->tv_sec = MAX_AUTOVAC_SLEEPTIME; } /* |