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POServiceStack.Redis throwing random errors when executing several updates in a transaction
 

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  1. POServiceStack.Redis throwing random errors when executing several updates in a transaction
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    <p>I have some code that is looping through a list of updates to apply to a number of Redis hashes, which for the most part works well. The catch is, that every once in a while I get an error such as the following:</p> <blockquote> <p>ServiceStack.Redis.RedisResponseException: unknown command '1234:date:20130909:daily', sPort: 34527, LastCommand: at ServiceStack.Redis.RedisNativeClient.CreateResponseError (System.String error) [0x00000] in :0 at ServiceStack.Redis.RedisNativeClient.ExpectWord (System.String word) [0x00000] in :0 at ServiceStack.Redis.RedisNativeClient.ExpectQueued () [0x00000] in :0 at ServiceStack.Redis.Pipeline.QueuedRedisOperation.ProcessResult () [0x00000] in :0</p> </blockquote> <p>I'm not sure if this is actually a glitch on the Redis side, or the client/driver, but something is definitely getting crossed up in the request/response.</p> <p>here is some example code of what I'm trying to do:</p> <pre><code>using (var redisClient = redisClientManager.GetClient()) { using (var multi = redisClient.CreateTransaction()) { foreach (var originalHashValue in hashDictionary) { multi.QueueCommand( r =&gt; r.IncrementValueInHash(hash, originalHashValue.Key, originalHashValue.Value)); } var redisUpdateResult = multi.Commit(); } } </code></pre> <p>The code is pretty simple, and the result isn't consistent, so i'm not sure what to think on this one. </p> <p>I'm using the latest stable redis, over a GigE LAN connection.</p> <ul> <li>redis_version:2.6.16</li> <li>less than .2ms ping between the boxes</li> <li>"mtr" shows its a consistent/solid connection</li> </ul> <p>Thoughts?</p>
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    1. USJesseP
    1. USJesseP
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    1. COAre you using PooledRedisClientManager? Does the bug go away when you switch to BasicRedisClientManager?
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      1. POServiceStack.Redis throwing random errors when executing several updates in a transaction
      1. USDanB
    2. COI am using the PooledRedisClientManager, and will try switching to basic to see if that fixes things. The problem is that this is a very intermittent issue, so only time will tell. Do you know of any pooling issues that would induce this behavior?
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      1. POServiceStack.Redis throwing random errors when executing several updates in a transaction
      1. USJesseP
    3. COThe high-level API exposes things such as Redis lists, sets, etc using .Net collection interfaces. Consider IQueryHandler.IEnumerable<Foo> GetFoos() -> return Redis.Sets["foos"]; - In this case, I could leak the Redis Client (attached to the collection) outside my using() scope, which would then cause issues when lazily enumerating through the collection as the client would have been reassigned to serve another query. This only shows up under load but gives you an example of ways you can trip yourself up using the PooledRedisClientManager.
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      1. POServiceStack.Redis throwing random errors when executing several updates in a transaction
      1. USDanB
 

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