Redis [BUG] redis/sentinel can probably run into tilt mode because long time waiting for dns reply

Long time blocking DNS request can cause sentinel enter tile mode. During sentinel's DNS request, the libc function getaddrinfo(), can possibly block sentinel/redis thread for more than 2.5 seconds, which exceeds the SENTINEL_TILT_TRIGGER threshold of 2000 ms. As a result, sentinel tilts.

1:X 21 Aug 2024 16:19:15.621 # Failed to resolve hostname 'redis-persistent-master-0.redis-persistent-master-svc.service-software'
1:X 21 Aug 2024 16:19:15.621 # +sdown master mymaster redis-persistent-master-0.redis-persistent-master-svc.service-software 6379
1:X 21 Aug 2024 16:19:25.633 # Failed to resolve hostname 'redis-persistent-sentinel-1.redis-persistent-sentinel-svc.service-software'
1:X 21 Aug 2024 16:19:25.634 # +sdown sentinel 89f6ad0dbb453989e9071edd6ada4ec15ac66c09 redis-persistent-sentinel-1.redis-persistent-sentinel-svc.service-software 26379 @ mymaster redis-persistent-master-0.redis-persistent-master-svc.service-software 6379
1:X 21 Aug 2024 16:19:25.634 # +sdown sentinel e0e60aafa5fad733a7176e2d4c28d0f6d9106cf5 redis-persistent-sentinel-2.redis-persistent-sentinel-svc.service-software 26379 @ mymaster redis-persistent-master-0.redis-persistent-master-svc.service-software 6379
1:X 21 Aug 2024 16:19:45.655 # +tilt #tilt mode entered
1:X 21 Aug 2024 16:20:05.673 # Failed to resolve hostname 'redis-persistent-sentinel-2.redis-persistent-sentinel-svc.service-software'
1:X 21 Aug 2024 16:20:05.763 # +tilt #tilt mode entered
1:X 21 Aug 2024 16:20:35.821 # -tilt #tilt mode exited
1:X 21 Aug 2024 16:20:59.379 # +sdown slave redis-persistent-master-2.redis-persistent-master-svc.service-software:6379 redis-persistent-master-2.redis-persistent-master-svc.service-software 6379 @ mymaster redis-persistent-master-0.redis-persistent-master-svc.service-software 6379
1:X 21 Aug 2024 16:21:16.333 # -sdown slave redis-persistent-master-2.redis-persistent-master-svc.service-software:6379 redis-persistent-master-2.redis-persistent-master-svc.service-software 6379 @ mymaster redis-persistent-master-0.redis-persistent-master-svc.service-software 6379
1:X 21 Aug 2024 16:21:20.529 # +sdown slave redis-persistent-master-2.redis-persistent-master-svc.service-software:6379 redis-persistent-master-2.redis-persistent-master-svc.service-software 6379 @ mymaster redis-persistent-master-0.redis-persistent-master-svc.service-software 6379

Comment From: ShooterIT

Hi @sunxiao2010n which version you are using