azure - 将 AbortOnConnectFail 设置为 false 后，我们仍然会在 Azure REDIS 上收到 ConnectTimeout

Question

我们在 .NET Core 2.0 Azure 应用服务中偶然收到以下错误日志:

StackExchange.Redis.RedisConnectionException: No connection is available to service this operation: GET post:307948:media;
It was not possible to connect to the redis server(s). 
To create a disconnected multiplexer, disable AbortOnConnectFail. 
ConnectTimeout; IOCP: (Busy=0,Free=1000,Min=4,Max=1000), 
WORKER: (Busy=20,Free=662,Min=4,Max=682), 
Local-CPU: n/a ---> System.AggregateException: One or more errors occurred. 
(It was not possible to connect to the redis server(s). 
To create a disconnected multiplexer, disable AbortOnConnectFail. ConnectTimeout) 
(UnableToConnect on api-prod.redis.cache.windows.net:6380/Interactive, 
Initializing, last: NONE, 
origin: BeginConnectAsync, outstanding: 0, last-read: 12s ago, last-write: 12s ago, 
unanswered-write: 290293s ago, keep-alive: 60s, 
state: Connecting, mgr: 10 of 10 available, 
last-heartbeat: never, global: 0s ago, v: 2.0.513.63329)

我找到的所有答案和博客文章都告诉我们将属性 AbortOnConnectFail 设置为 false。我们已经将此属性设置为 false，但仍然会出现这些错误。这是我们的实现:

public class CacheService : ICacheService
    {
        private static IRedisConfiguration _redisConfiguration;
        private readonly IDateService _dateService;

        private static readonly Lazy<ConnectionMultiplexer> LazyConnection =
            new Lazy<ConnectionMultiplexer>(() =>
            {
                var configurationOptions = CreateConfigurationOptions();
                return ConnectionMultiplexer.Connect(configurationOptions);
            });

        public CacheService(IRedisConfiguration redisConfiguration, IDateService dateService)
        {
            _redisConfiguration = redisConfiguration;
            _dateService = dateService;
        }

        private static ConfigurationOptions CreateConfigurationOptions()
        {
            var deltaBackOffInMilliseconds = TimeSpan.FromSeconds(5).Milliseconds;
            var maxDeltaBackOffInMilliseconds = TimeSpan.FromSeconds(20).Milliseconds;

            var config = new ConfigurationOptions();

            //https://learn.microsoft.com/en-us/azure/architecture/best-practices/retry-service-specific#azure-redis-cache-retry-guidelines
            config.AbortOnConnectFail = false;
            config.ConnectRetry = 3;
            config.ConnectTimeout = 2000;
            config.ReconnectRetryPolicy = new ExponentialRetry(deltaBackOffInMilliseconds, maxDeltaBackOffInMilliseconds);

            config.EndPoints.Add(_redisConfiguration.HostName);
            config.Password = _redisConfiguration.Password;
            config.Ssl = _redisConfiguration.Ssl;
            config.DefaultDatabase = _redisConfiguration.DatabaseId;

            return config;
        }

        public static ConnectionMultiplexer Connection => LazyConnection.Value;

        public static IDatabase Cache => Connection.GetDatabase();
}

在 Azure 应用服务上，我检查了 TCP 连接，没有显示任何警告。 传出连接有所增加，但低于 1000。

运行两个 API 实例时，我们有大约 80 个连接，几乎保持不变。当天没有增加，因此连接管理似乎是正确的。

关于如何解决这个问题有什么建议吗？也许这是由于更多的配置调整。

Azure Redis:P1 高级层StackExchange.Redis 版本:2.0.513在 .NET Core 2.0 上运行的 .NET Core API

提前非常感谢。

Answer 1

我不知道您是否得到了解决方案的答案，但如果您还没有，并且您在 azure 中使用 redis 缓存进行非 ssl，也许您必须按照图中所示激活它。