Redis The subjective down line problem of the main node judged by frequent brush of sentinel service in redis

I use the container deployment method, and the specific versions are as follows: redis 5.0.5 docker 19.03.4

sentinel1-log:

6:X 02 Jun 2021 02:14:32.584 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
6:X 02 Jun 2021 02:14:32.585 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=6, just started
6:X 02 Jun 2021 02:14:32.585 # Configuration loaded
6:X 02 Jun 2021 02:14:32.586 * Running mode=sentinel, port=6380.
6:X 02 Jun 2021 02:14:32.586 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
6:X 02 Jun 2021 02:14:32.589 # Sentinel ID is 05673b09b6bac6a692e8b38271de3307e4888f47
6:X 02 Jun 2021 02:14:32.589 # +monitor master mymaster 192.9.180.42 6379 quorum 2
6:X 02 Jun 2021 02:14:32.589 * +slave slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:32.592 * +slave slave 192.9.180.44:6379 192.9.180.44 6379 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:33.817 * +sentinel sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:34.660 - Accepted 192.9.180.43:35916
6:X 02 Jun 2021 02:14:42.859 - Accepted 192.9.180.44:33590
6:X 02 Jun 2021 02:14:43.969 * +sentinel sentinel b1a1c5cb0bf9adcaceef6a29cee6bcc8c46580ff 192.9.180.44 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:18.459 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:22.045 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:27.608 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:28.115 # +sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:29.827 # -sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:29.827 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 09:04:15.171 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 09:04:16.172 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 09:04:30.257 # +sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 09:04:31.573 # -sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:17:49.341 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:17:49.757 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:17:59.501 # +sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:17:59.501 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:18:08.939 # -sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:18:08.939 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 22:01:02.563 # +sdown sentinel b1a1c5cb0bf9adcaceef6a29cee6bcc8c46580ff 192.9.180.44 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 22:01:04.107 # +sdown slave 192.9.180.44:6379 192.9.180.44 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 22:01:15.373 # -sdown slave 192.9.180.44:6379 192.9.180.44 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 22:01:15.373 # -sdown sentinel b1a1c5cb0bf9adcaceef6a29cee6bcc8c46580ff 192.9.180.44 6380 @ mymaster 192.9.180.42 6379

sentinel2-log:

6:X 02 Jun 2021 02:14:31.794 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
6:X 02 Jun 2021 02:14:31.794 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=6, just started
6:X 02 Jun 2021 02:14:31.794 # Configuration loaded
6:X 02 Jun 2021 02:14:31.796 * Running mode=sentinel, port=6380.
6:X 02 Jun 2021 02:14:31.796 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
6:X 02 Jun 2021 02:14:31.900 # Sentinel ID is defae1ae716738a8ee4d066374cacbf0d8195f87
6:X 02 Jun 2021 02:14:31.900 # +monitor master mymaster 192.9.180.42 6379 quorum 2
6:X 02 Jun 2021 02:14:31.908 * +slave slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:31.910 * +slave slave 192.9.180.44:6379 192.9.180.44 6379 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:33.872 - Accepted 192.9.180.42:18104
6:X 02 Jun 2021 02:14:34.607 * +sentinel sentinel 05673b09b6bac6a692e8b38271de3307e4888f47 192.9.180.42 6380 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:42.015 - Accepted 192.9.180.44:46718
6:X 02 Jun 2021 02:14:43.969 * +sentinel sentinel b1a1c5cb0bf9adcaceef6a29cee6bcc8c46580ff 192.9.180.44 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:18.017 - Accepted 192.9.180.42:19652
6:X 07 Jun 2021 02:59:18.957 - Accepted 192.9.180.44:34050
6:X 07 Jun 2021 02:59:21.393 # +tilt #tilt mode entered
6:X 07 Jun 2021 02:59:21.923 - Error writing to client: Broken pipe
6:X 07 Jun 2021 02:59:21.923 - Client closed connection
6:X 07 Jun 2021 02:59:29.775 # +tilt #tilt mode entered
6:X 07 Jun 2021 02:59:59.796 # -tilt #tilt mode exited
6:X 07 Jun 2021 09:04:16.139 # +tilt #tilt mode entered
6:X 07 Jun 2021 09:04:16.141 - Accepted 192.9.180.42:27558
6:X 07 Jun 2021 09:04:16.151 - Accepted 192.9.180.44:49942
6:X 07 Jun 2021 09:04:16.154 - Client closed connection
6:X 07 Jun 2021 09:04:16.154 - Client closed connection
6:X 07 Jun 2021 09:04:46.154 # -tilt #tilt mode exited
6:X 07 Jun 2021 10:17:40.615 - Client closed connection
6:X 07 Jun 2021 10:17:40.615 - Client closed connection
6:X 07 Jun 2021 10:17:40.615 - Accepted 192.9.180.44:48594
6:X 07 Jun 2021 10:17:40.615 - Accepted 192.9.180.42:47974
6:X 07 Jun 2021 10:17:59.714 # +tilt #tilt mode entered
6:X 07 Jun 2021 10:18:08.906 - Accepted 192.9.180.42:48016
6:X 07 Jun 2021 10:18:08.908 - Accepted 192.9.180.44:48707
6:X 07 Jun 2021 10:18:08.908 - Client closed connection
6:X 07 Jun 2021 10:18:08.908 - Client closed connection
6:X 07 Jun 2021 10:18:29.665 # -tilt #tilt mode exited
6:X 07 Jun 2021 22:01:02.533 # +sdown sentinel b1a1c5cb0bf9adcaceef6a29cee6bcc8c46580ff 192.9.180.44 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 22:01:04.142 # +sdown slave 192.9.180.44:6379 192.9.180.44 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 22:01:15.357 # -sdown slave 192.9.180.44:6379 192.9.180.44 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 22:01:15.357 # -sdown sentinel b1a1c5cb0bf9adcaceef6a29cee6bcc8c46580ff 192.9.180.44 6380 @ mymaster 192.9.180.42 6379

sentinel3-log:

6:X 02 Jun 2021 02:14:41.937 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
6:X 02 Jun 2021 02:14:41.937 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=6, just started
6:X 02 Jun 2021 02:14:41.937 # Configuration loaded
6:X 02 Jun 2021 02:14:41.939 * Running mode=sentinel, port=6380.
6:X 02 Jun 2021 02:14:41.939 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
6:X 02 Jun 2021 02:14:41.941 # Sentinel ID is b1a1c5cb0bf9adcaceef6a29cee6bcc8c46580ff
6:X 02 Jun 2021 02:14:41.941 # +monitor master mymaster 192.9.180.42 6379 quorum 2
6:X 02 Jun 2021 02:14:41.943 * +slave slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:41.961 * +slave slave 192.9.180.44:6379 192.9.180.44 6379 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:42.009 * +sentinel sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:42.769 * +sentinel sentinel 05673b09b6bac6a692e8b38271de3307e4888f47 192.9.180.42 6380 @ mymaster 192.9.180.42 6379
6:X 02 Jun 2021 02:14:43.974 - Accepted 192.9.180.43:49460
6:X 02 Jun 2021 02:14:44.016 - Accepted 192.9.180.42:2400
6:X 07 Jun 2021 02:59:18.482 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:22.078 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:27.549 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:28.120 # +sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:29.824 # -sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 02:59:29.824 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 09:04:15.379 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 09:04:16.202 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 09:04:30.304 # +sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 09:04:31.601 # -sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:17:49.288 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:17:49.734 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:17:59.409 # +sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:17:59.409 # +sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:18:08.952 # -sdown slave 192.9.180.43:6379 192.9.180.43 6379 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 10:18:08.953 # -sdown sentinel defae1ae716738a8ee4d066374cacbf0d8195f87 192.9.180.43 6380 @ mymaster 192.9.180.42 6379
6:X 07 Jun 2021 22:01:04.725 # +tilt #tilt mode entered
6:X 07 Jun 2021 22:01:15.302 - Client closed connection
6:X 07 Jun 2021 22:01:15.348 - Client closed connection
6:X 07 Jun 2021 22:01:15.350 - Accepted 192.9.180.42:21036
6:X 07 Jun 2021 22:01:15.350 - Accepted 192.9.180.43:48488
6:X 07 Jun 2021 22:01:15.358 # +tilt #tilt mode entered
6:X 07 Jun 2021 22:01:45.389 # -tilt #tilt mode exited

In the above log, the sentinel service judged that the subjective offline time of the master node exceeded the sentinel down after milliseconds mymaster 2000 configuration I set, and did not switch to the objective offline state

Thank you very much for your help