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    <p>I have continued to debug this problem, and have fixed numerous things on my platform to avoid this exception. Here is what I have done to solve the issue:</p> <p><strong>Executive summary:</strong></p> <p>People encountering this exception should check:</p> <ol> <li>That the PooledRedisClientsManager (IRedisClientsManager) is registed in a singleton scope</li> <li>That the RedisMqServer (IMessageService) is registered in a singleton scope</li> <li>That any utilized RedisClient returned from either of the above is properly disposed of, to ensure that the pooled clients are not left stale.</li> </ol> <p><strong>The solution to my problem:</strong></p> <p>First of all, this exception is thrown by the PooledRedisClient <a href="https://github.com/ServiceStack/ServiceStack.Redis/pull/35" rel="nofollow noreferrer">because it has no more pooled connections available</a>.</p> <p>I'm registering all the required Redis stuff in the StructureMap IoC container (not unity as in the author's case). Thanks to <a href="https://stackoverflow.com/questions/18497021/servicestack-redis-unable-to-connect-sport-50071">this post</a> I was reminded that the PooledRedisClientManager should be a singleton - I also decided to register the RedisMqServer as a singleton:</p> <pre class="lang-cs prettyprint-override"><code> ObjectFactory.Configure(x =&gt; { // register the message queue stuff as Singletons in this AppDomain x.For&lt;IRedisClientsManager&gt;() .Singleton() .Use(BuildRedisClientsManager); x.For&lt;IMessageService&gt;() .Singleton() .Use&lt;RedisMqServer&gt;() .Ctor&lt;IRedisClientsManager&gt;().Is(i =&gt; i.GetInstance&lt;IRedisClientsManager&gt;()) .Ctor&lt;int&gt;("retryCount").Is(2) .Ctor&lt;TimeSpan?&gt;().Is(TimeSpan.FromSeconds(5)); // Retrieve a new message factory from the singleton IMessageService x.For&lt;IMessageFactory&gt;() .Use(i =&gt; i.GetInstance&lt;IMessageService&gt;().MessageFactory); }); </code></pre> <p>My "BuildRedisClientManager" function looks like this:</p> <pre class="lang-cs prettyprint-override"><code>private static IRedisClientsManager BuildRedisClientsManager() { var appSettings = new AppSettings(); var redisClients = appSettings.Get("redis-servers", "redis.local:6379").Split(','); var redisFactory = new PooledRedisClientManager(redisClients); redisFactory.ConnectTimeout = 5; redisFactory.IdleTimeOutSecs = 30; redisFactory.PoolTimeout = 3; return redisFactory; } </code></pre> <p>Then, when it comes to producing messages it's very important that the utilized RedisClient is properly disposed of, otherwise we run into the dreaded "Timeout Expired" (thanks to <a href="https://stackoverflow.com/questions/10597223/redis-servicestack-pooled-connection-client/10599194#10599194">this post</a>). I have the following helper code to send a message to the queue:</p> <pre class="lang-cs prettyprint-override"><code>public static void PublishMessage&lt;T&gt;(T msg) { try { using (var producer = GetMessageProducer()) { producer.Publish&lt;T&gt;(msg); } } catch (Exception ex) { // TODO: Log or whatever... I'm not throwing to avoid showing users that we have a broken MQ } } private static IMessageQueueClient GetMessageProducer() { var producer = ObjectFactory.GetInstance&lt;IMessageService&gt;() as RedisMqServer; var client = producer.CreateMessageQueueClient(); return client; } </code></pre> <p>I hope this helps solve your issue too.</p>
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