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articles/event-hubs/event-hubs-features.md

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If a reader disconnects from a partition, when it reconnects it begins reading at the checkpoint that was previously submitted by the last reader of that partition in that consumer group. When the reader connects, it passes the offset to the event hub to specify the location at which to start reading. In this way, you can use checkpointing to both mark events as "complete" by downstream applications, and to provide resiliency if a failover between readers running on different machines occurs. It is possible to return to older data by specifying a lower offset from this checkpointing process. Through this mechanism, checkpointing enables both failover resiliency and event stream replay.
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> [!NOTE]
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> If you are using Azure Blob Storage as the checkpoint store in an environment that supports a different version of Storage Blob SDK than those typically available on Azure, you'll need to use code to change the Storage service API version to the specific version supported by that environment. For example, if you are running [Event Hubs on an Azure Stack Hub version 2002](https://docs.microsoft.com/azure-stack/user/event-hubs-overview), the highest available version for the Storage service is version 2017-11-09. In this case, you will need to use the code to change the Storage service API version to 2017-11-09. For an example on how to target a specific Storage API version, see these samples on GitHub:
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> If you are using Azure Blob Storage as the checkpoint store in an environment that supports a different version of Storage Blob SDK than those typically available on Azure, you'll need to use code to change the Storage service API version to the specific version supported by that environment. For example, if you are running [Event Hubs on an Azure Stack Hub version 2002](https://docs.microsoft.com/azure-stack/user/event-hubs-overview), the highest available version for the Storage service is version 2017-11-09. In this case, you need to use code to target the Storage service API version to 2017-11-09. For an example on how to target a specific Storage API version, see these samples on GitHub:
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> - [.NET](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/eventhub/Azure.Messaging.EventHubs.Processor/samples/Sample10_RunningWithDifferentStorageVersion.cs).
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> - [Java](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/eventhubs/azure-messaging-eventhubs-checkpointstore-blob/src/samples/java/com/azure/messaging/eventhubs/checkpointstore/blob/EventProcessorWithOlderStorageVersion.java)
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> - [JavaScript](https://github.com/Azure/azure-sdk-for-js/blob/master/sdk/eventhub/eventhubs-checkpointstore-blob/samples/receiveEventsWithDownleveledStorage.js) or [TypeScript](https://github.com/Azure/azure-sdk-for-js/blob/master/sdk/eventhub/eventhubs-checkpointstore-blob/samples/receiveEventsWithDownleveledStorage.ts)

articles/event-hubs/event-processor-balance-partition-load.md

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When the checkpoint is performed to mark an event as processed, an entry in checkpoint store is added or updated with the event's offset and sequence number. Users should decide the frequency of updating the checkpoint. Updating after each successfully processed event can have performance and cost implications as it triggers a write operation to the underlying checkpoint store. Also, checkpointing every single event is indicative of a queued messaging pattern for which a Service Bus queue might be a better option than an event hub. The idea behind Event Hubs is that you get "at least once" delivery at great scale. By making your downstream systems idempotent, it is easy to recover from failures or restarts that result in the same events being received multiple times.
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> [!NOTE]
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> If you are using Azure Blob Storage as the checkpoint store in an environment that supports a different version of Storage Blob SDK than those typically available on Azure, you'll need to use code to change the Storage service API version to the specific version supported by that environment. For example, if you are running [Event Hubs on an Azure Stack Hub version 2002](https://docs.microsoft.com/azure-stack/user/event-hubs-overview), the highest available version for the Storage service is version 2017-11-09. In this case, you will need to use the code to change the Storage service API version to 2017-11-09. For an example on how to target a specific Storage API version, see these samples on GitHub:
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> If you are using Azure Blob Storage as the checkpoint store in an environment that supports a different version of Storage Blob SDK than those typically available on Azure, you'll need to use code to change the Storage service API version to the specific version supported by that environment. For example, if you are running [Event Hubs on an Azure Stack Hub version 2002](https://docs.microsoft.com/azure-stack/user/event-hubs-overview), the highest available version for the Storage service is version 2017-11-09. In this case, you need to use code to target the Storage service API version to 2017-11-09. For an example on how to target a specific Storage API version, see these samples on GitHub:
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> - [.NET](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/eventhub/Azure.Messaging.EventHubs.Processor/samples/Sample10_RunningWithDifferentStorageVersion.cs).
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> - [Java](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/eventhubs/azure-messaging-eventhubs-checkpointstore-blob/src/samples/java/com/azure/messaging/eventhubs/checkpointstore/blob/EventProcessorWithOlderStorageVersion.java)
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> - [JavaScript](https://github.com/Azure/azure-sdk-for-js/blob/master/sdk/eventhub/eventhubs-checkpointstore-blob/samples/receiveEventsWithDownleveledStorage.js) or [TypeScript](https://github.com/Azure/azure-sdk-for-js/blob/master/sdk/eventhub/eventhubs-checkpointstore-blob/samples/receiveEventsWithDownleveledStorage.ts)

articles/event-hubs/use-blob-storage-checkpoint-store-azure-stack-hub.md

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# Use Blob Storage as checkpoint store on Azure Stack Hub
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If you're using Azure Blob Storage as the checkpoint store in an environment that supports a different version of Storage Blob SDK than the ones that are typically available on Azure, you'll need to use code to change the Storage service API version to the specific version supported by that environment. For example, if you're running [Event Hubs on an Azure Stack Hub version 2002](https://docs.microsoft.com/azure-stack/user/event-hubs-overview), the highest available version for the Storage service is version 2017-11-09. In this case, you'll need to use the code to change the Storage service API version to 2017-11-09. For an example on how to target a specific Storage API version, see these samples on GitHub:
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If you're using Azure Blob Storage as the checkpoint store in an environment that supports a different version of Storage Blob SDK than the ones that are typically available on Azure, you'll need to use code to change the Storage service API version to the specific version supported by that environment. For example, if you're running [Event Hubs on an Azure Stack Hub version 2002](https://docs.microsoft.com/azure-stack/user/event-hubs-overview), the highest available version for the Storage service is version 2017-11-09. In this case, you need to use code to target the Storage service API version to 2017-11-09. For an example on how to target a specific Storage API version, see these samples on GitHub:
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- [.NET](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/eventhub/Azure.Messaging.EventHubs.Processor/samples/Sample10_RunningWithDifferentStorageVersion.cs)
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- [Java](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/eventhubs/azure-messaging-eventhubs-checkpointstore-blob/src/samples/java/com/azure/messaging/eventhubs/checkpointstore/blob/EventProcessorWithOlderStorageVersion.java).

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