StackExchange.Redis超时异常致ASP.NET MVC网站请求阻塞求助

云上老周

2026-8-6

ASP.NET MVC网站使用StackExchange.Redis高流量下请求卡顿问题

我在基于.NET Framework的ASP.NET MVC网站中使用StackExchange.Redis NuGet包，当流量稍有增长时，网站无法加载，请求卡在IIS工作进程中。

Redis连接助手代码

public class RedisCacheHelper
{
    public static T Get<T>(string cacheKey) where T : class
    {
            var cache = RedisConnectorHelper.Connection.GetDatabase();
            var itemValue = cache.StringGetAsync(cacheKey).Result;
            T item = null;
            if (!string.IsNullOrEmpty(itemValue))
                item = JsonConvert.DeserializeObject<T>(itemValue);
            //T item = cache.StringGet(cacheKey) as T;
            return item;
    }
    public static void Set(string cacheKey, object ObjValue, int cacheMinutes = 60)
    {
            var cache = RedisConnectorHelper.Connection.GetDatabase();
            if (!string.IsNullOrEmpty(cacheKey) && ObjValue != null)
            {
                var Expiration = TimeSpan.FromMinutes(cacheMinutes);
                var redisVal = JsonConvert.SerializeObject(ObjValue);
                cache.StringSetAsync(cacheKey, redisVal, Expiration, When.NotExists, CommandFlags.FireAndForget);
            }
    }
    public static void ClearRedisCache(string Key = null)
    {
        if (!string.IsNullOrEmpty(Key))
        {
            var cache = RedisConnectorHelper.Connection.GetDatabase();
            var endpoints = RedisConnectorHelper.Connection.GetEndPoints();
            var server = RedisConnectorHelper.Connection.GetServer(endpoints[0]);
            var keys = server.Keys();
            var _ObjKey = keys.Where(k => k.ToString().ToLower().Equals(Key.ToLower())).FirstOrDefault();
            if (!string.IsNullOrEmpty(_ObjKey))
                cache.KeyDelete(_ObjKey);
        }
        else
        {
            var endpoints = RedisConnectorHelper.Connection.GetEndPoints();
            var server = RedisConnectorHelper.Connection.GetServer(endpoints[0]);
            server.FlushAllDatabases();
        }
    }
}
public class RedisConnectorHelper
{
    static RedisConnectorHelper()
    {
        RedisConnectorHelper.lazyConnection = new Lazy<ConnectionMultiplexer>(() =>
        {
            return ConnectionMultiplexer.Connect("SomeConnection");
        });
    }

    private static Lazy<ConnectionMultiplexer> lazyConnection;

    public static ConnectionMultiplexer Connection
    {
        get
        {
            return lazyConnection.Value;
        }
    }
}

服务器事件查看器捕获的异常信息

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 12/3/2022 4:53:53 AM 
Event time (UTC): 12/3/2022 2:53:53 AM 
Event ID: d5f0dd48b0554c508c5111b92599081e 
Event sequence: 56886 
Event occurrence: 5 
Event detail code: 0 

Application information: 
    Application domain: /LM/W3SVC/3/ROOT-1-133144634776972114 
    Trust level: Full 
    Application Virtual Path: / 
    Application Path: Some Path
    Machine name: EC2AMAZ-VG4448R 

Process information: 
    Process ID: 8412 
    Process name: w3wp.exe 
    Account name: EC2AMAZ-VG4448R\MyASPMVC_web 

Exception information: 
    Exception type: RedisTimeoutException 
    Exception message: Timeout performing SETEX (5000ms), next: GET AvailableResources, inst: 1345, qu: 0, qs: 852, aw: False, rs: ReadAsync, ws: Idle, in: 0, in-pipe: 0, out-pipe: 0, serverEndpoint: MyASPMVC-redis.gfqxrw.0001.use1.cache.amazonaws.com:6379, mc: 1/1/0, mgr: 10 of 10 available, clientName: EC2AMAZ-VG4448R, IOCP: (Busy=0,Free=1000,Min=16,Max=1000), WORKER: (Busy=647,Free=32120,Min=16,Max=32767), v: 2.2.50.36290 (Please take a look at this article for some common client-side issues that can cause timeouts: https://stackexchange.github.io/StackExchange.Redis/Timeouts)
   at StackExchange.Redis.ConnectionMultiplexer.ExecuteSyncImpl[T](Message message, ResultProcessor`1 processor, ServerEndPoint server)
   at StackExchange.Redis.RedisBase.ExecuteSync[T](Message message, ResultProcessor`1 processor, ServerEndPoint server)
   at MyASPMVCRevamp.Service.RedisCacheHelper.Set(String cacheKey, Object ObjValue, Int32 cacheMinutes) in D:\Work\\MyASPMVCFronts\MyASPMVCRevamp.sln\Master\MyASPMVCRevamp.Service\RedisService.cs:line 40
   at MyASPMVCRevamp.Service.GeneralServices.GetStaticPageByID(Int32 ID) in D:\Work\\MyASPMVCFronts\MyASPMVCRevamp.sln\Master\MyASPMVCRevamp.Service\GeneralServices.cs:line 353
   at lambda_method(Closure , ControllerBase , Object[] )
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c.<BeginInvokeSynchronousActionMethod>b__9_0(IAsyncResult asyncResult, ActionInvocation innerInvokeState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__11_0()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_1.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_1.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_6.<BeginInvokeAction>b__3()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_1.<BeginInvokeAction>b__5(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.<>c.<BeginExecuteCore>b__152_1(IAsyncResult asyncResult, ExecuteCoreState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult)
   at System.Web.Mvc.MvcHandler.<>c.<BeginProcessRequest>b__20_1(IAsyncResult asyncResult, ProcessRequestState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)
   at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.<>c__DisplayClass5_0.<Wrap>b__0()
   at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.Wrap[TResult](Func`1 func)
   at System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride)

Request information: 
    Request URL: https://www.MyASPMVC.com:443/en-us/elogin
    Request path: /en-us/elogin 
    User host address: 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: EC2AMAZ-VG4448R\MyASPMVC_web 

Thread information: 
    Thread ID: 640 
    Thread account name: EC2AMAZ-VG4448R\MyASPMVC_web 
    Is impersonating: False 
    Stack trace:    at StackExchange.Redis.ConnectionMultiplexer.ExecuteSyncImpl[T](Message message, ResultProcessor`1 processor, ServerEndPoint server)
   at StackExchange.Redis.RedisBase.ExecuteSync[T](Message message, ResultProcessor`1 processor, ServerEndPoint server)
   at MyASPMVCRevamp.Service.RedisCacheHelper.Set(String cacheKey, Object ObjValue, Int32 cacheMinutes) in D:\Work\\MyASPMVCFronts\MyASPMVCRevamp.sln\Master\MyASPMVCRevamp.Service\RedisService.cs:line 40
   at MyASPMVCRevamp.Service.GeneralServices.GetStaticPageByID(Int32 ID) in D:\Work\\MyASPMVCFronts\MyASPMVCRevamp.sln\Master\MyASPMVCRevamp.Service\GeneralServices.cs:line 353
   at lambda_method(Closure , ControllerBase , Object[] )
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c.<BeginInvokeSynchronousActionMethod>b__9_0(IAsyncResult asyncResult, ActionInvocation innerInvokeState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__11_0()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_1.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_1.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_6.<BeginInvokeAction>b__3()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_1.<BeginInvokeAction>b__5(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.<>c.<BeginExecuteCore>b__152_1(IAsyncResult asyncResult, ExecuteCoreState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult)
   at System.Web.Mvc.MvcHandler.<>c.<BeginProcessRequest>b__20_1(IAsyncResult asyncResult, ProcessRequestState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)
   at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.<>c__DisplayClass5_0.<Wrap>b__0()
   at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.Wrap[TResult](Func`1 func)
   at System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride)

Custom event details:

问题分析与解决方案

从异常信息来看，核心问题是RedisTimeoutException，请求队列堆积（qs: 852），工作线程繁忙（WORKER: Busy=647），结合代码，主要修复点如下：

1. 替换异步方法的同步阻塞调用

Get方法中使用.Result阻塞线程，高并发下会耗尽线程池资源，引发队列堆积。改为异步方法并使用await调用：

public static async Task<T> GetAsync<T>(string cacheKey) where T : class
{
    var cache = RedisConnectorHelper.Connection.GetDatabase();
    var itemValue = await cache.StringGetAsync(cacheKey);
    T item = null;
    if (!string.IsNullOrEmpty(itemValue))
        item = JsonConvert.DeserializeObject<T>(itemValue);
    return item;
}

控制器中调用示例：

var data = await RedisCacheHelper.GetAsync<YourDataType>(cacheKey);

2. 优化Redis连接配置

在连接字符串中添加关键参数，提升稳定性：

return ConnectionMultiplexer.Connect("SomeConnection,connectTimeout=10000,syncTimeout=10000,abortOnConnectFail=false,keepAlive=60,responseTimeout=10000");

3. 避免全量遍历Redis键

ClearRedisCache方法中server.Keys()全量遍历会严重阻塞Redis，删除单个键直接调用KeyDeleteAsync即可：

public static async Task ClearRedisCacheAsync(string key = null)
{
    if (!string.IsNullOrEmpty(key))
    {
        var cache = RedisConnectorHelper.Connection.GetDatabase();
        await cache.KeyDeleteAsync(key);
    }
    else
    {
        var endpoints = RedisConnectorHelper.Connection.GetEndPoints();
        var server = RedisConnectorHelper.Connection.GetServer(endpoints[0]);
        await server.FlushAllDatabasesAsync();
    }
}

4. 调整线程池配置

在Global.asax的Application_Start中设置线程池最小线程数，避免线程不足：

protected void Application_Start()
{
    int minWorkerThreads = Environment.ProcessorCount * 10;
    int minIoThreads = Environment.ProcessorCount * 10;
    ThreadPool.SetMinThreads(minWorkerThreads, minIoThreads);
    
    // 其他初始化代码
}

5. 升级StackExchange.Redis版本

当前使用的2.2.50版本存在已知性能问题，升级到最新稳定版可修复大量bug。

内容的提问来源于stack exchange，提问作者Ahmed Kamal

StackExchange.Redis超时异常致ASP.NET MVC网站请求阻塞求助

Redis连接助手代码 #

服务器事件查看器捕获的异常信息 #

问题分析与解决方案 #

1. 替换异步方法的同步阻塞调用 #

2. 优化Redis连接配置 #

3. 避免全量遍历Redis键 #

4. 调整线程池配置 #

5. 升级StackExchange.Redis版本 #