为什么使用StackExchange扫描Redis密钥时KeyAsync循环挂起。Redis?

我试图使用StackExchange扫描所有与特定模式匹配的Redis密钥。Redis库。然而,我的代码挂在 await foreach 扫描钥匙时的声明。以下是我所拥有的:

public class DataMigration(IConnectionMultiplexer connection) : IHostedService
{
    public async Task StartAsync(CancellationToken cancellationToken)
    {
        const string pattern = "{hangfire}:recurring-job:EmailNotificationJob:*";
        List<RedisKey> keys = [];

        var db = connection.GetDatabase();

        foreach (var endpoint in connection.GetEndPoints())
        {
            var server = connection.GetServer(endpoint);

            if (!server.IsConnected || server.IsReplica)
            {
                continue;
            }

            // Using SCAN for pagination
            await foreach (var key in server.KeysAsync(database: db.Database, pattern: pattern).WithCancellation(cancellationToken))
            {
                keys.Add(key); // this is never reached
            }
        }

        Console.WriteLine($"Found {keys.Count} keys to update."); // this is never reached
    }

    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
}

var builder = Host.CreateApplicationBuilder(args);

builder.Services.AddSingleton<IConnectionMultiplexer>(serviceProvider =>
{
    var loggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();

    const string redisHost = ...
    const int redisPort = ...
    const string redisPassword = ...

    var redisConfiguration = new ConfigurationOptions
    {
        EndPoints = { $"{redisHost}:{redisPort}" },
        Password = redisPassword,
        Ssl = true,
        AbortOnConnectFail = false, // Keep trying to connect
        ConnectTimeout = 15000, // 15 seconds timeout
        SyncTimeout = 15000, // 15 seconds timeout for synchronous operations
        LoggerFactory = loggerFactory
    };

    return ConnectionMultiplexer.Connect(redisConfiguration);
});

builder.Services.AddHostedService<DataMigration>();

var app = builder.Build();

app.Run();