Context:
We have a cluster consisting of 3 masters + 3 replicas (1 replica for each master). We are simulating situation when some of our cluster is down (in this example we shut down 3 replicas). Our .NET clients have all of the 6 nodes put into configuration. Also option "resolveDns=true" is set. (resolveDns is not crucial here, it's just because nodes know themselves through their ips so that I set it to have not duplicated connections by hostname and by ip after discovery).
When some of the nodes in the cluster are down they are not responsive. So they exhaust default connection timeout of 5000 milliseconds. They exhaust even much higher connection timeouts (tens of seconds). It was noticed in previous versions of StackExchange.Redis (<2.2.xx) that this behavior caused problems because after .Connect() randomly some of the nodes were unselectable by reason DidNotRespond. Upgrading to 2.6.xx mostly solved this issue (for which im glad) due to queueing feature. But I noticed that the underlying issue is still there and in some scenarios might cause problems so that's the reason I'm posting this. I found one use case in which it manifests but you might be aware of more.
var options = ConfigurationOptions.Parse("server1:6116,server2:6116,server3:6116,server4:6116,server5:6116,server6:6116,password=some_password,resolveDns=true");
options.BacklogPolicy = BacklogPolicy.FailFast;
var connection = ConnectionMultiplexer.Connect(options, new LoggerWriter());
var status = connection.GetStatus();
connection.GetDatabase(0).StringSet("test2", "test2");
No connection (requires writable - not eligible for replica) is active/available to service this operation: SET test2; It was not possible to connect to the redis server(s). Error connecting right now. To allow this multiplexer to continue retrying until it's able to connect, use abortConnect=false in your connection string or AbortOnConnectFail=false; in your code. ConnectTimeout, mc: 1/1/0, mgr: 10 of 10 available, clientName: MACHINENAME(SE.Redis-v2.6.122.38350), PerfCounterHelperkeyHashSlot: 8899, IOCP: (Busy=0,Free=1000,Min=16,Max=1000), WORKER: (Busy=0,Free=32767,Min=16,Max=32767), POOL: (Threads=23,QueuedItems=0,CompletedItems=526,Timers=17), v: 2.6.122.38350
20:04:14.2643: Connecting (sync) on .NET 6.0.19 (StackExchange.Redis: v2.6.122.38350)
20:04:14.2770: server01.redacted-domain.com:6116,server02.redacted-domain.com:6116,server03.redacted-domain.com:6116,server04.redacted-domain.com:6116,server05.redacted-domain.com:6116,server06.redacted-domain.com:6116,password=*****,resolveDns=True
20:04:14.2782: Using DNS to resolve 'server01.redacted-domain.com'...
20:04:14.2801: 'server01.redacted-domain.com' => 10.0.0.36
20:04:14.2806: Using DNS to resolve 'server02.redacted-domain.com'...
20:04:14.2863: 'server02.redacted-domain.com' => 10.0.0.37
20:04:14.2868: Using DNS to resolve 'server03.redacted-domain.com'...
20:04:14.2874: 'server03.redacted-domain.com' => 10.0.0.38
20:04:14.2882: Using DNS to resolve 'server04.redacted-domain.com'...
20:04:14.2888: 'server04.redacted-domain.com' => 10.0.0.39
20:04:14.2889: Using DNS to resolve 'server05.redacted-domain.com'...
20:04:14.2895: 'server05.redacted-domain.com' => 10.0.0.40
20:04:14.2897: Using DNS to resolve 'server06.redacted-domain.com'...
20:04:14.2903: 'server06.redacted-domain.com' => 10.0.0.41
20:04:14.2906: 10.0.0.36:6116/Interactive: Connecting...
20:04:14.2911: 10.0.0.36:6116: BeginConnectAsync
20:04:14.2921: 10.0.0.37:6116/Interactive: Connecting...
20:04:14.2925: 10.0.0.37:6116: BeginConnectAsync
20:04:14.2933: 10.0.0.38:6116/Interactive: Connecting...
20:04:14.2936: 10.0.0.38:6116: BeginConnectAsync
20:04:14.2944: 10.0.0.39:6116/Interactive: Connecting...
20:04:14.2947: 10.0.0.39:6116: BeginConnectAsync
20:04:14.2955: 10.0.0.40:6116/Interactive: Connecting...
20:04:14.2958: 10.0.0.40:6116: BeginConnectAsync
20:04:14.2966: 10.0.0.41:6116/Interactive: Connecting...
20:04:14.2969: 10.0.0.41:6116: BeginConnectAsync
20:04:14.2977: 6 unique nodes specified (with tiebreaker)
20:04:14.2983: 10.0.0.36:6116: OnConnectedAsync init (State=Connecting)
20:04:14.2984: 10.0.0.37:6116: OnConnectedAsync init (State=Connecting)
20:04:14.2987: 10.0.0.38:6116: OnConnectedAsync init (State=Connecting)
20:04:14.2989: 10.0.0.39:6116: OnConnectedAsync init (State=Connecting)
20:04:14.2991: 10.0.0.40:6116: OnConnectedAsync init (State=Connecting)
20:04:14.3012: 10.0.0.41:6116: OnConnectedAsync init (State=Connecting)
20:04:14.3019: Allowing 6 endpoint(s) 00:00:05 to respond...
20:04:14.3033: Awaiting 6 available task completion(s) for 5000ms, IOCP: (Busy=0,Free=1000,Min=16,Max=1000), WORKER: (Busy=1,Free=32766,Min=16,Max=32767), POOL: (Threads=19,QueuedItems=0,CompletedItems=356,Timers=25)
20:04:14.3187: 10.0.0.41:6116/Interactive: Connected
20:04:14.3199: 10.0.0.41:6116: Server handshake
20:04:14.3227: 10.0.0.39:6116/Interactive: Connected
20:04:14.3233: 10.0.0.41:6116: Authenticating (password)
20:04:14.3260: 10.0.0.39:6116: Server handshake
20:04:14.3265: 10.0.0.39:6116: Authenticating (password)
20:04:14.3271: 10.0.0.41:6116: Setting client name: MACHINENAME(SE.Redis-v2.6.122.38350)
20:04:14.3276: 10.0.0.39:6116: Setting client name: MACHINENAME(SE.Redis-v2.6.122.38350)
20:04:14.3278: 10.0.0.40:6116/Interactive: Connected
20:04:14.3281: 10.0.0.40:6116: Server handshake
20:04:14.3283: 10.0.0.40:6116: Authenticating (password)
20:04:14.3285: 10.0.0.41:6116: Setting client lib/ver
20:04:14.3288: 10.0.0.39:6116: Setting client lib/ver
20:04:14.3290: 10.0.0.40:6116: Setting client name: MACHINENAME(SE.Redis-v2.6.122.38350)
20:04:14.3293: 10.0.0.41:6116: Auto-configuring...
20:04:14.3295: 10.0.0.39:6116: Auto-configuring...
20:04:14.3297: 10.0.0.40:6116: Setting client lib/ver
20:04:14.3300: 10.0.0.41:6116: Requesting tie-break (Key="__Booksleeve_TieBreak")...
20:04:14.3302: 10.0.0.39:6116: Requesting tie-break (Key="__Booksleeve_TieBreak")...
20:04:14.3305: 10.0.0.40:6116: Auto-configuring...
20:04:14.3308: 10.0.0.41:6116/Interactive: Writing: GET __Booksleeve_TieBreak
20:04:14.3310: 10.0.0.39:6116/Interactive: Writing: GET __Booksleeve_TieBreak
20:04:14.3312: 10.0.0.40:6116: Requesting tie-break (Key="__Booksleeve_TieBreak")...
20:04:14.3334: 10.0.0.41:6116: Sending critical tracer (handshake): ECHO
20:04:14.3356: 10.0.0.39:6116: Sending critical tracer (handshake): ECHO
20:04:14.3359: 10.0.0.39:6116/Interactive: Writing: ECHO
20:04:14.3362: 10.0.0.41:6116/Interactive: Writing: ECHO
20:04:14.3365: 10.0.0.41:6116: Flushing outbound buffer
20:04:14.3367: 10.0.0.39:6116: Flushing outbound buffer
20:04:14.3370: 10.0.0.39:6116: OnEstablishingAsync complete
20:04:14.3373: 10.0.0.39:6116: Starting read
20:04:14.3377: 10.0.0.40:6116/Interactive: Writing: GET __Booksleeve_TieBreak
20:04:14.3379: 10.0.0.41:6116: OnEstablishingAsync complete
20:04:14.3382: 10.0.0.40:6116: Sending critical tracer (handshake): ECHO
20:04:14.3385: 10.0.0.41:6116: Starting read
20:04:14.3388: 10.0.0.40:6116/Interactive: Writing: ECHO
20:04:14.3391: 10.0.0.40:6116: Flushing outbound buffer
20:04:14.3394: 10.0.0.40:6116: OnEstablishingAsync complete
20:04:14.3398: 10.0.0.40:6116: Starting read
20:04:14.3476: 10.0.0.41:6116: Auto-configured (CONFIG) read-only replica: true
20:04:14.3486: 10.0.0.39:6116: Auto-configured (CONFIG) read-only replica: true
20:04:14.3487: 10.0.0.40:6116: Auto-configured (CONFIG) read-only replica: true
20:04:14.3512: 10.0.0.41:6116: Auto-configured (CONFIG) databases: 16
20:04:14.3516: 10.0.0.39:6116: Auto-configured (CONFIG) databases: 16
20:04:14.3519: 10.0.0.40:6116: Auto-configured (CONFIG) databases: 16
20:04:14.3524: 10.0.0.41:6116: Auto-configured (INFO) role: primary
20:04:14.3532: 10.0.0.39:6116: Auto-configured (INFO) role: primary
20:04:14.3536: 10.0.0.40:6116: Auto-configured (INFO) role: primary
20:04:14.3540: 10.0.0.41:6116: Auto-configured (INFO) version: 5.0.8
20:04:14.3545: 10.0.0.39:6116: Auto-configured (INFO) version: 5.0.8
20:04:14.3548: 10.0.0.40:6116: Auto-configured (INFO) version: 5.0.8
20:04:14.3552: 10.0.0.41:6116: Auto-configured (INFO) server-type: cluster
20:04:14.3556: 10.0.0.39:6116: Auto-configured (INFO) server-type: cluster
20:04:14.3558: 10.0.0.40:6116: Auto-configured (INFO) server-type: cluster
20:04:14.3565: Response from 10.0.0.40:6116/Interactive / GET __Booksleeve_TieBreak: (null)
20:04:14.3573: Response from 10.0.0.40:6116/Interactive / ECHO: BulkString: 16 bytes
20:04:14.3575: Response from 10.0.0.41:6116/Interactive / GET __Booksleeve_TieBreak: Error: MOVED 6202 10.0.0.40:6116
20:04:14.3579: Response from 10.0.0.39:6116/Interactive / GET __Booksleeve_TieBreak: Error: MOVED 6202 10.0.0.40:6116
20:04:14.3582: 10.0.0.40:6116: OnConnectedAsync completed (From command: ECHO)
20:04:14.3584: Response from 10.0.0.41:6116/Interactive / ECHO: BulkString: 16 bytes
20:04:14.3587: Response from 10.0.0.39:6116/Interactive / ECHO: BulkString: 16 bytes
20:04:14.3590: 10.0.0.41:6116: OnConnectedAsync completed (From command: ECHO)
20:04:14.3593: 10.0.0.39:6116: OnConnectedAsync completed (From command: ECHO)
20:04:19.3038: Not all available tasks completed cleanly (from ReconfigureAsync#1489, timeout 5000ms), IOCP: (Busy=0,Free=1000,Min=16,Max=1000), WORKER: (Busy=9,Free=32758,Min=16,Max=32767), POOL: (Threads=23,QueuedItems=0,CompletedItems=443,Timers=11)
20:04:19.3682: 10.0.0.36:6116: OnConnectedAsync completed (Disconnected)
20:04:19.3723: 10.0.0.38:6116: OnConnectedAsync completed (Disconnected)
20:04:19.3727: 10.0.0.37:6116: OnConnectedAsync completed (Disconnected)
20:04:19.3734: Server[0] (10.0.0.36:6116) Status: WaitingForActivation (inst: 0, qs: 0, in: 0, qu: 0, aw: False, in-pipe: -1, out-pipe: -1, bw: Inactive, rs: NotStarted. ws: Initializing)
20:04:19.3801: Server[1] (10.0.0.37:6116) Status: RanToCompletion (inst: 0, qs: 0, in: 0, qu: 0, aw: False, in-pipe: -1, out-pipe: -1, bw: Inactive, rs: NotStarted. ws: Initializing)
20:04:19.3870: Server[2] (10.0.0.38:6116) Status: RanToCompletion (inst: 0, qs: 0, in: 0, qu: 0, aw: False, in-pipe: -1, out-pipe: -1, bw: Inactive, rs: NotStarted. ws: Initializing)
20:04:19.3924: Server[3] (10.0.0.39:6116) Status: RanToCompletion (inst: 13, qs: 0, in: 0, qu: 13, aw: False, in-pipe: 0, out-pipe: 0, bw: Inactive, rs: ReadAsync. ws: Idle)
20:04:19.4106: Server[4] (10.0.0.40:6116) Status: RanToCompletion (inst: 13, qs: 0, in: 0, qu: 13, aw: False, in-pipe: 0, out-pipe: 0, bw: Inactive, rs: ReadAsync. ws: Idle)
20:04:19.4208: Server[5] (10.0.0.41:6116) Status: RanToCompletion (inst: 13, qs: 0, in: 0, qu: 13, aw: False, in-pipe: 0, out-pipe: 0, bw: Inactive, rs: ReadAsync. ws: Idle)
20:04:19.4278: Endpoint summary:
20:04:19.4289: 10.0.0.36:6116: Endpoint is (Interactive: Connecting, Subscription: Connecting)
20:04:19.4291: 10.0.0.37:6116: Endpoint is (Interactive: Connecting, Subscription: Connecting)
20:04:19.4294: 10.0.0.38:6116: Endpoint is (Interactive: Connecting, Subscription: Connecting)
20:04:19.4310: Connection failed: 10.0.0.37:6116 (Subscription, UnableToConnect): UnableToConnect on 10.0.0.37:6116/Subscription, Initializing/NotStarted, last: NONE, origin: BeginConnectAsync, outstanding: 0, last-read: 5s ago, last-write: 5s ago, keep-alive: 60s, state: Connecting, mgr: 10 of 10 available, last-heartbeat: never, global: 0s ago, v: 2.6.122.38350
20:04:19.4317: Connection failed: 10.0.0.36:6116 (Interactive, UnableToConnect): UnableToConnect on 10.0.0.36:6116/Interactive, Initializing/NotStarted, last: NONE, origin: BeginConnectAsync, outstanding: 0, last-read: 5s ago, last-write: 5s ago, keep-alive: 60s, state: Connecting, mgr: 10 of 10 available, last-heartbeat: never, global: 0s ago, v: 2.6.122.38350
20:04:19.4329: Connection failed: 10.0.0.37:6116 (Interactive, UnableToConnect): UnableToConnect on 10.0.0.37:6116/Interactive, Initializing/NotStarted, last: NONE, origin: BeginConnectAsync, outstanding: 0, last-read: 5s ago, last-write: 5s ago, keep-alive: 60s, state: Connecting, mgr: 10 of 10 available, last-heartbeat: never, global: 0s ago, v: 2.6.122.38350
20:04:19.4331: Connection failed: 10.0.0.36:6116 (Subscription, UnableToConnect): UnableToConnect on 10.0.0.36:6116/Subscription, Initializing/NotStarted, last: NONE, origin: BeginConnectAsync, outstanding: 0, last-read: 5s ago, last-write: 5s ago, keep-alive: 60s, state: Connecting, mgr: 10 of 10 available, last-heartbeat: never, global: 0s ago, v: 2.6.122.38350
20:04:19.4332: Connection failed: 10.0.0.38:6116 (Subscription, UnableToConnect): UnableToConnect on 10.0.0.38:6116/Subscription, Initializing/NotStarted, last: NONE, origin: BeginConnectAsync, outstanding: 0, last-read: 5s ago, last-write: 5s ago, keep-alive: 60s, state: Connecting, mgr: 10 of 10 available, last-heartbeat: never, global: 0s ago, v: 2.6.122.38350
20:04:19.4334: Connection failed: 10.0.0.38:6116 (Interactive, UnableToConnect): UnableToConnect on 10.0.0.38:6116/Interactive, Initializing/NotStarted, last: NONE, origin: BeginConnectAsync, outstanding: 0, last-read: 5s ago, last-write: 5s ago, keep-alive: 60s, state: Connecting, mgr: 10 of 10 available, last-heartbeat: never, global: 0s ago, v: 2.6.122.38350
20:04:19.4341: 10.0.0.39:6116: Endpoint is (Interactive: ConnectedEstablished, Subscription: ConnectedEstablished)
20:04:19.4343: 10.0.0.40:6116: Endpoint is (Interactive: ConnectedEstablished, Subscription: ConnectedEstablished)
20:04:19.4346: 10.0.0.41:6116: Endpoint is (Interactive: ConnectedEstablished, Subscription: ConnectedEstablished)
20:04:19.4348: Task summary:
20:04:19.4350: 10.0.0.36:6116: Returned, but incorrectly
20:04:19.4353: 10.0.0.37:6116: Returned, but incorrectly
20:04:19.4355: 10.0.0.38:6116: Returned, but incorrectly
20:04:19.4360: 10.0.0.39:6116: Returned with success as Cluster primary (Source: From command: ECHO)
20:04:19.4640: 10.0.0.40:6116: Returned with success as Cluster primary (Source: From command: ECHO)
20:04:19.4649: 10.0.0.41:6116: Returned with success as Cluster primary (Source: From command: ECHO)
20:04:19.4671: 10.0.0.39:6116: OnConnectedAsync already connected start
20:04:19.4674: 10.0.0.39:6116/Interactive: Writing: PING
20:04:19.4679: 10.0.0.41:6116: OnConnectedAsync already connected start
20:04:19.4682: 10.0.0.41:6116/Interactive: Writing: PING
20:04:19.4689: 10.0.0.40:6116: OnConnectedAsync already connected start
20:04:19.4692: 10.0.0.40:6116/Interactive: Writing: PING
20:04:19.4697: Allowing 3 endpoint(s) -00:00:00.1680000 to respond...
20:04:19.4701: Awaiting 3 available task completion(s) for -168ms, IOCP: (Busy=0,Free=1000,Min=16,Max=1000), WORKER: (Busy=1,Free=32766,Min=16,Max=32767), POOL: (Threads=23,QueuedItems=0,CompletedItems=472,Timers=17)
20:04:19.4706: Timeout before awaiting for tasks, IOCP: (Busy=0,Free=1000,Min=16,Max=1000), WORKER: (Busy=1,Free=32766,Min=16,Max=32767), POOL: (Threads=23,QueuedItems=0,CompletedItems=472,Timers=17)
20:04:19.4710: Server[0] (10.0.0.39:6116) Status: WaitingForActivation (inst: 15, qs: 1, in: 0, qu: 15, aw: False, in-pipe: 0, out-pipe: 0, bw: Inactive, rs: ReadAsync. ws: Idle)
20:04:19.4714: Server[1] (10.0.0.41:6116) Status: WaitingForActivation (inst: 14, qs: 1, in: 0, qu: 14, aw: False, in-pipe: 0, out-pipe: 0, bw: Inactive, rs: ReadAsync. ws: Idle)
20:04:19.4718: Server[2] (10.0.0.40:6116) Status: WaitingForActivation (inst: 14, qs: 1, in: 0, qu: 14, aw: False, in-pipe: 0, out-pipe: 0, bw: Inactive, rs: ReadAsync. ws: Idle)
20:04:19.4722: Endpoint summary:
20:04:19.4725: 10.0.0.39:6116: Endpoint is (Interactive: ConnectedEstablished, Subscription: ConnectedEstablished)
20:04:19.4729: 10.0.0.41:6116: Endpoint is (Interactive: ConnectedEstablished, Subscription: ConnectedEstablished)
20:04:19.4733: 10.0.0.40:6116: Endpoint is (Interactive: ConnectedEstablished, Subscription: ConnectedEstablished)
20:04:19.4737: Task summary:
20:04:19.4741: 10.0.0.39:6116: Did not respond (Task.Status: WaitingForActivation)
20:04:19.4745: 10.0.0.41:6116: Did not respond (Task.Status: WaitingForActivation)
20:04:19.4751: 10.0.0.40:6116: Did not respond (Task.Status: WaitingForActivation)
20:04:19.4756: Cluster: 16384 of 16384 slots covered
20:04:19.4764: Endpoint Summary:
20:04:19.4776: 10.0.0.36:6116: Standalone v3.0.0, primary; keep-alive: 00:01:00; int: Connecting; sub: Connecting; not in use: DidNotRespond
20:04:19.4796: 10.0.0.36:6116: int ops=0, qu=0, qs=0, qc=0, wr=0, socks=2; sub ops=0, qu=0, qs=0, qc=0, wr=0, socks=2
20:04:19.4856: 10.0.0.36:6116: Circular op-count snapshot; int: 0 (0,00 ops/s; spans 10s); sub: 0 (0,00 ops/s; spans 10s)
20:04:19.4858: 10.0.0.37:6116: Standalone v3.0.0, primary; keep-alive: 00:01:00; int: Connecting; sub: Connecting; not in use: DidNotRespond
20:04:19.4861: 10.0.0.37:6116: int ops=0, qu=0, qs=0, qc=0, wr=0, socks=2; sub ops=0, qu=0, qs=0, qc=0, wr=0, socks=2
20:04:19.4864: 10.0.0.37:6116: Circular op-count snapshot; int: 0 (0,00 ops/s; spans 10s); sub: 0 (0,00 ops/s; spans 10s)
20:04:19.4866: 10.0.0.38:6116: Standalone v3.0.0, primary; keep-alive: 00:01:00; int: Connecting; sub: Connecting; not in use: DidNotRespond
20:04:19.4869: 10.0.0.38:6116: int ops=0, qu=0, qs=0, qc=0, wr=0, socks=2; sub ops=0, qu=0, qs=0, qc=0, wr=0, socks=2
20:04:19.4871: 10.0.0.38:6116: Circular op-count snapshot; int: 0 (0,00 ops/s; spans 10s); sub: 0 (0,00 ops/s; spans 10s)
20:04:19.4875: 10.0.0.39:6116: Cluster v5.0.8, primary; 16 databases; keep-alive: 00:01:00; int: ConnectedEstablished; sub: ConnectedEstablished, 1 active; not in use: DidNotRespond
20:04:19.4876: 10.0.0.39:6116: int ops=15, qu=0, qs=1, qc=0, wr=0, socks=1; sub ops=6, qu=0, qs=0, qc=0, wr=0, subs=1, socks=1
20:04:19.4879: 10.0.0.39:6116: Circular op-count snapshot; int: 0+15=15 (1,50 ops/s; spans 10s); sub: 0+6=6 (0,60 ops/s; spans 10s)
20:04:19.4881: 10.0.0.40:6116: Cluster v5.0.8, primary; 16 databases; keep-alive: 00:01:00; int: ConnectedEstablished; sub: ConnectedEstablished, 1 active; not in use: DidNotRespond
20:04:19.4883: 10.0.0.40:6116: int ops=14, qu=0, qs=1, qc=0, wr=0, socks=1; sub ops=6, qu=0, qs=0, qc=0, wr=0, subs=1, socks=1
20:04:19.4886: 10.0.0.40:6116: Circular op-count snapshot; int: 0+14=14 (1,40 ops/s; spans 10s); sub: 0+6=6 (0,60 ops/s; spans 10s)
20:04:19.4889: Response from 10.0.0.39:6116/Interactive / PING: SimpleString: PONG
20:04:19.4891: Response from 10.0.0.40:6116/Interactive / PING: SimpleString: PONG
20:04:19.4894: Response from 10.0.0.41:6116/Interactive / PING: SimpleString: PONG
20:04:19.4896: 10.0.0.41:6116: Cluster v5.0.8, primary; 16 databases; keep-alive: 00:01:00; int: ConnectedEstablished; sub: ConnectedEstablished, 1 active; not in use: DidNotRespond
20:04:19.4899: 10.0.0.39:6116: OnConnectedAsync already connected end
20:04:19.4902: 10.0.0.40:6116: OnConnectedAsync already connected end
20:04:19.4904: 10.0.0.41:6116: OnConnectedAsync already connected end
20:04:19.4906: 10.0.0.41:6116: int ops=14, qu=0, qs=0, qc=0, wr=0, socks=1; sub ops=6, qu=0, qs=0, qc=0, wr=0, subs=1, socks=1
20:04:19.4909: 10.0.0.41:6116: Circular op-count snapshot; int: 0+14=14 (1,40 ops/s; spans 10s); sub: 0+6=6 (0,60 ops/s; spans 10s)
20:04:19.4911: Sync timeouts: 0; async timeouts: 0; fire and forget: 0; last heartbeat: -1s ago
20:04:19.4914: Starting heartbeat...
20:04:19.4919: Total connect time: 5 227 ms
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