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You might jump to the conclusion that you could easily poll an Azure Table for work instead of polling a queue Perhaps you have a property in your table called Status that defaults to new The worker role could poll the table, looking for all entities whose Status property equals new Once a list is returned, the worker could process each entity and set their Status to complete At its base, this sounds like a simple approach Unfortunately, this approach is a red herring It suffers from some severe drawbacks that you might not find until you re in testing or production because they won t show up until you have multiple instances of your role running The first problem is of concurrency If you have multiple instances of your worker role polling a table, they could each retrieve the same entities in their queries.

private CustomVideoSink _sink = new CustomVideoSink();

This would result in those entities being processed multiple times, possibly leading to status updates getting entangled This is the exact concurrency problem the Azure Queue service was designed to avoid The other, more important, issue is one of recoverability and durability You want your system to be able to recover if there s a problem processing a particular entity Perhaps you have each worker role set the status property to the name of the instance to track that the entity is being worked on by a particular instance When the work is completed, the instance would then set the status property to done On the surface, this approach seems to make sense The flaw is that when an instance fails during processing (which will happen), the entity will never be recovered and processed.

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Of course, if any of the handlers mark the event as handled, it isn t sent to any of the remaining handlers.

It ll remain flagged with the instance name of the worker processing the item, so it ll never be cleared and will never be picked up in the query of the table to be processed It will, in effect, be hung The system administrator would have to go in and manually reset the status property back to new There isn t a way for the entity to be recovered from a failure and be reassigned to another instance It would take a fair amount of code to overcome the issues of polling a table by multiple consumers, and in the end you d end up having built the same thing as the Azure Queue service The Queue service is designed to play this role, and it removes the need to write all of this dirty plumbing code.

PS (3) > gps svchost |%{$t=0}{$t+=$_.handles}{$t} 3238

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The Queue service provides a way for work to be distributed among multiple worker instances, and to easily recover that work if the instance fails A key concept of cloud architecture is to design for failure recoverability in an application It s to be expected that nodes go down (for one reason or another) and will be restarted and recovered, possibly on a completely different server Queues are the easiest way to get messages into a worker role, and they ll be discussed in detail in the next chapter Now, though, we ll discuss inter-role communication, which lets a worker role receive a message from outside of Azure..

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