阿里云主从redis出现链接超时，但是监控显示一切正常

[QianYS]

错误所示：
2024-07-31 21:23:42.156 +08:00 [ERR] Connection id "0HN57R8AORGCD", Request id "0HN57R8AORGCD:00000001": An unhandled exception was thrown by the application.
System.Exception: 【xsusercenter.redis.rds.aliyuncs.com/18】Status unavailable, waiting for recovery. Connect to redis-server(xsusercenter.redis.rds.aliyuncs.com:6379 -> Unspecified/xsusercenter.redis.rds.aliyuncs.com:6379) timeout, DEBUG: Dns.GetHostEntry(xsusercenter.redis.rds.aliyuncs.com)=System.Net.IPHostEntry
---> System.TimeoutException: Connect to redis-server(xsusercenter.redis.rds.aliyuncs.com:6379 -> Unspecified/xsusercenter.redis.rds.aliyuncs.com:6379) timeout, DEBUG: Dns.GetHostEntry(xsusercenter.redis.rds.aliyuncs.com)=System.Net.IPHostEntry
at FreeRedis.Internal.DefaultRedisSocket.Connect()
at FreeRedis.Internal.DefaultRedisSocket.Write(CommandPacket cmd)
at FreeRedis.RedisClient.SingleInsideAdapter.<>c__DisplayClass5_01.<AdapterCall>b__0() at FreeRedis.RedisClient.LogCallCtrl[T](CommandPacket cmd, Func1 func, Boolean aopBefore, Boolean aopAfter)
at FreeRedis.RedisClient.LogCall[T](CommandPacket cmd, Func1 func) at FreeRedis.RedisClient.SingleInsideAdapter.AdapterCall[TValue](CommandPacket cmd, Func2 parse)
at FreeRedis.RedisClient.Call(CommandPacket cmd)
at FreeRedis.Internal.RedisClientPoolPolicy.PrevReheatConnectionPool(ObjectPool1 pool, Int32 minPoolSize) --- End of inner exception stack trace --- at FreeRedis.Internal.ObjectPool.ObjectPool1.GetFree(Boolean checkAvailable)
at FreeRedis.Internal.ObjectPool.ObjectPool1.Get(Nullable1 timeout)
at FreeRedis.RedisClient.PoolingAdapter.GetRedisSocket(CommandPacket cmd)
at FreeRedis.RedisClient.PoolingAdapter.<>c__DisplayClass10_01.<<AdapterCallAsync>b__0>d.MoveNext() --- End of stack trace from previous location --- at FreeRedis.RedisClient.LogCallAsync[T](CommandPacket cmd, Func1 func)
at InternalApi.Controller.PhoneController.GetRedis(String redisConnStr, String num) in /app/InternalApi/Controller/PhoneController.cs:line 41
at InternalApi.Controller.PhoneController.QueryPhone(String phone) in /app/InternalApi/Controller/PhoneController.cs:line 74
at lambda_method24(Closure, Object)
at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask1 actionResultValueTask) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync() --- End of stack trace from previous location --- at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker) at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|7_0(Endpoint endpoint, Task requestTask, ILogger logger) at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext) at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider) at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication1 application)

发生异常时的阿里云监控均是正常



亦未找到慢读取情况

问题发生时间大约是7月31日21点-21点40，问题发生后短时间无法解决，故将redis读取调整为读取数据库
具体api代码如图

是否能有更具体的相关信息提现是因为什么而导致的连接超时，或者出现问题时应该如何去定位这个问题的根本原因

[2881099]

怎么不用单例啊？

[MoondanceZ]

我也出现这种情况, 一般都是在站点发布之后出现, 很奇怪

[2881099]

确保不是被redis防火墙拒绝，min pool size设置为1，避免预热导致防火墙错误判断为攻击而拒绝。

请确保网络环境通畅，健康。

[MoondanceZ]

min pool size 和 max pool size 怎么理解呢

[kiyeer]

我的也阿里云Redis，出现跟楼主一样的情况，我使用的单例注入。每次暂停站点，更新文件后重新开启，都会出现链接超时的问题，然后刷新1,2次就好了。不知道为什么？