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Update service-bus-async-messaging.md
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articles/service-bus-messaging/service-bus-async-messaging.md

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@@ -43,7 +43,7 @@ As a mitigation, the code must read the error and halt any retries of the messag
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For more information on how application code should handle throttling concerns, see the [documentation on the Throttling Pattern](/azure/architecture/patterns/throttling).
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### Issue for an Azure dependency
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Other components within Azure can occasionally have service issues. For example, when a system that Service Bus uses is being upgraded, that system can temporarily experience reduced capabilities. To work around these types of issues, Service Bus regularly investigates and implements mitigations. Side effects of these mitigations do appear. For example, to handle transient issues with storage, Service Bus implements a system that allows message send operations to work consistently. Due to the nature of the mitigation, a sent message can take up to 15 minutes to appear in the affected queue or subscription and be ready for a receive operation. Generally speaking, most entities will not experience this issue. However, given the number of entities in Service Bus within Azure, this mitigation is sometimes needed for a small subset of Service Bus customers.
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Other components within Azure can occasionally have service issues. For example, when a system that Service Bus uses is being upgraded, that system can temporarily experience reduced capabilities. To work around these types of issues, Service Bus regularly investigates and implements mitigations. Side effects of these mitigations do appear. For example, to handle transient issues with storage, Service Bus implements a system that allows message send operations to work consistently. Generally speaking, most entities will not experience this issue. However, given the number of entities in Service Bus within Azure, this mitigation is sometimes needed for a small subset of Service Bus customers.
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### Service Bus failure on a single subsystem
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With any application, circumstances can cause an internal component of Service Bus to become inconsistent. When Service Bus detects this, it collects data from the application to aid in diagnosing what happened. Once the data is collected, the application is restarted in an attempt to return it to a consistent state. This process happens fairly quickly, and results in an entity appearing to be unavailable for up to a few minutes, though typical down times are much shorter.

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