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  1. Frequently asked questions - Azure Event Hubs - Azure Event ...

    docs.microsoft.com/en-us/azure/event-hubs/event...
    • General
    • Apache Kafka Integration
    • Throughput Units
    • Dedicated Clusters
    • Best Practices
    • Pricing
    • Quotas
    • Troubleshooting
    • Next Steps

    What is an Event Hubs namespace?

    A namespace is a scoping container for Event Hub/Kafka Topics. It gives you a unique FQDN. A namespace serves as an application container that can house multiple Event Hub/Kafka Topics.

    When do I create a new namespace vs. use an existing namespace?

    Capacity allocations (throughput units (TUs)) are billed at the namespace level. A namespace is also associated with a region. You may want to create a new namespace instead of using an existing one in one of the following scenarios: 1. You need an Event Hub associated with a new region. 2. You need an Event Hub associated with a different subscription. 3. You need an Event Hub with a distinct capacity allocation (that is, the capacity need for the namespace with the added event hub would exc...

    What is the difference between Event Hubs Basic and Standard tiers?

    The Standard tier of Azure Event Hubs provides features beyond what is available in the Basic tier. The following features are included with Standard: 1. Longer event retention 2. Additional brokered connections, with an overage charge for more than the number included 3. More than a single consumer group 4. Capture 5. Kafka integration For more information about pricing tiers, including Event Hubs Dedicated, see the Event Hubs pricing details.

    How do I integrate my existing Kafka application with Event Hubs?

    Event Hubs provides a Kafka endpoint that can be used by your existing Apache Kafka based applications. A configuration change is all that is required to have the PaaS Kafka experience. It provides an alternative to running your own Kafka cluster. Event Hubs supports Apache Kafka 1.0 and newer client versions and works with your existing Kafka applications, tools, and frameworks. For more information, see Event Hubs for Kafka repo.

    What configuration changes need to be done for my existing application to talk to Event Hubs?

    To connect to an event hub, you'll need to update the Kafka client configs. It's done by creating an Event Hubs namespace and obtaining the connection string. Change the bootstrap.servers to point the Event Hubs FQDN and the port to 9093. Update the sasl.jaas.config to direct the Kafka client to your Event Hubs endpoint (which is the connection string you've obtained), with correct authentication as shown below: bootstrap.servers={YOUR.EVENTHUBS.FQDN}:9093request.timeout.ms=60000security.prot...

    What is the message/event size for Event Hubs?

    The maximum message size allowed for Event Hubs is 1 MB.

    What are Event Hubs throughput units?

    Throughput in Event Hubs defines the amount of data in mega bytes or the number (in thousands) of 1-KB events that ingress and egress through Event Hubs. This throughput is measured in throughput units (TUs). Purchase TUs before you can start using the Event Hubs service. You can explicitly select Event Hubs TUs either by using portal or Event Hubs Resource Manager templates.

    Do throughput units apply to all event hubs in a namespace?

    Yes, throughput units (TUs) apply to all event hubs in an Event Hubs namespace. It means that you purchase TUs at the namespace level and are shared among the event hubs under that namespace. Each TU entitles the namespace to the following capabilities: 1. Up to 1 MB per second of ingress events (events sent into an event hub), but no more than 1000 ingress events, management operations, or control API calls per second. 2. Up to 2 MB per second of egress events (events consumed from an event...

    How are throughput units billed?

    Throughput units (TUs) are billed on an hourly basis. The billing is based on the maximum number of units that was selected during the given hour.

    What are Event Hubs Dedicated clusters?

    Event Hubs Dedicated clusters offer single-tenant deployments for customers with most demanding requirements. This offering builds a capacity-based cluster that is not bound by throughput units. It means that you could use the cluster to ingest and stream your data as dictated by the CPU and memory usage of the cluster. For more information, see Event Hubs Dedicated clusters.

    How much does a single capacity unit let me achieve?

    For a dedicated cluster, how much you can ingest and stream depends on various factors such as your producers, consumers, the rate at which you're ingesting and processing, and much more. Following table shows the benchmark results that we achieved during our testing: In the testing, the following criteria was used: 1. A dedicated Event Hubs cluster with four capacity units (CUs) was used. 2. The event hub used for ingestion had 200 partitions. 3. The data that was ingested was received by tw...

    How do I create an Event Hubs Dedicated cluster?

    You create an Event Hubs dedicated cluster by submitting a quota increase support request or by contacting the Event Hubs team. It typically takes about two weeks to get the cluster deployed and handed over to be used by you. This process is temporary until a complete self-serve is made available through the Azure portal.

    How many partitions do I need?

    The number of partitions is specified at creation and must be between 2 and 32. The partition count isn't changeable, so you should consider long-term scale when setting partition count. Partitions are a data organization mechanism that relates to the downstream parallelism required in consuming applications. The number of partitions in an event hub directly relates to the number of concurrent readers you expect to have. For more information on partitions, see Partitions. You may want to set...

    Where can I find more pricing information?

    For complete information about Event Hubs pricing, see the Event Hubs pricing details.

    Is there a charge for retaining Event Hubs events for more than 24 hours?

    The Event Hubs Standard tier does allow message retention periods longer than 24 hours, for a maximum of seven days. If the size of the total number of stored events exceeds the storage allowance for the number of selected throughput units (84 GB per throughput unit), the size that exceeds the allowance is charged at the published Azure Blob storage rate. The storage allowance in each throughput unit covers all storage costs for retention periods of 24 hours (the default) even if the throughp...

    How is the Event Hubs storage size calculated and charged?

    The total size of all stored events, including any internal overhead for event headers or on disk storage structures in all event hubs, is measured throughout the day. At the end of the day, the peak storage size is calculated. The daily storage allowance is calculated based on the minimum number of throughput units that were selected during the day (each throughput unit provides an allowance of 84 GB). If the total size exceeds the calculated daily storage allowance, the excess storage is bi...

    Are there any quotas associated with Event Hubs?

    For a list of all Event Hubs quotas, see quotas.

    Why am I not able to create a namespace after deleting it from another subscription?

    When you delete a namespace from a subscription, wait for 4 hours before recreating it with the same name in another subscription. Otherwise, you may receive the following error message: Namespace already exists.

    What are some of the exceptions generated by Event Hubs and their suggested actions?

    For a list of possible Event Hubs exceptions, see Exceptions overview.

    Diagnostic logs

    Event Hubs supports two types of diagnostics logs- Capture error logs and operational logs - both of which are represented in json and can be turned on through the Azure portal.

    You can learn more about Event Hubs by visiting the following links: 1. Event Hubs overview 2. Create an Event Hub 3. Event Hubs Auto-inflate

  2. What is Azure Event Hubs? - a Big Data ingestion service ...

    docs.microsoft.com/en-us/azure/event-hubs/event...
    • Why Use Event Hubs?
    • Fully Managed Paas
    • Support For Real-Time and Batch Processing
    • Scalable
    • Rich Ecosystem
    • Key Architecture Components
    • Next Steps

    Data is valuable only when there is an easy way to process and get timely insights from data sources. Event Hubs provides a distributed stream processing platform with low latency and seamless integration, with data and analytics services inside and outside Azure to build your complete big data pipeline.Event Hubs represents the \\"front door\\" for an event pipeline, often called an event ingestor in solution architectures. An event ingestor is a component or service that sits between event publ...

    Event Hubs is a fully managed Platform-as-a-Service (PaaS) with little configuration or management overhead, so you focus on your business solutions. Event Hubs for Apache Kafka ecosystems gives you the PaaS Kafka experience without having to manage, configure, or run your clusters.

    Ingest, buffer, store, and process your stream in real time to get actionable insights. Event Hubs uses a partitioned consumer model, enabling multiple applications to process the stream concurrently and letting you control the speed of processing.Capture your data in near-real time in an Azure Blob storage or Azure Data Lake Storage for long-term retention or micro-batch processing. You can achieve this behavior on the same stream you use for deriving real-time analytics. Setting up capture...

    With Event Hubs, you can start with data streams in megabytes, and grow to gigabytes or terabytes. The Auto-inflate feature is one of the many options available to scale the number of throughput units to meet your usage needs.

    Event Hubs for Apache Kafka ecosystems enables Apache Kafka (1.0 and later) clients and applications to talk to Event Hubs. You do not need to set up, configure, and manage your own Kafka clusters.With a broad ecosystem available in various languages (.NET, Java, Python, Go, Node.js), you can easily start processing your streams from Event Hubs. All supported client languages provide low-level integration. The ecosystem also provides you with seamless integration with Azure services like Azur...

    Event Hubs contains the following key components: 1. Event producers: Any entity that sends data to an event hub. Event publishers can publish events using HTTPS or AMQP 1.0 or Apache Kafka (1.0 and above) 2. Partitions: Each consumer only reads a specific subset, or partition, of the message stream. 3. Consumer groups: A view (state, position, or offset) of an entire event hub. Consumer groups enable consuming applications to each have a separate view of the event stream. They read the strea...

    To get started using Event Hubs, see the Send and receive events tutorials: 1. .NET Core 2. .NET Framework 3. Java 4. Python 5. Node.js 6. Go 7. C (send only) 8. Apache Storm (receive only)To learn more about Event Hubs, see the following articles: 1. Event Hubs features overview 2. Frequently asked questions.

  3. Overview of features - Azure Event Hubs - Azure Event Hubs ...

    docs.microsoft.com/en-us/azure/event-hubs/event...
    • Namespace
    • Event Hubs For Apache Kafka
    • Event Publishers
    • Capture
    • Partitions
    • SAS Tokens
    • Event Consumers
    • Next Steps

    An Event Hubs namespace provides a unique scoping container, referenced by its fully qualified domain name, in which you create one or more event hubs or Kafka topics.

    This feature provides an endpoint that enables customers to talk to Event Hubs using the Kafka protocol. This integration provides customers a Kafka endpoint. This enables customers to configure their existing Kafka applications to talk to Event Hubs, giving an alternative to running their own Kafka clusters. Event Hubs for Apache Kafka supports Kafka protocol 1.0 and later.With this integration, you don't need to run Kafka clusters or manage them with Zookeeper. This also allows you to work...

    Any entity that sends data to an event hub is an event producer, or event publisher. Event publishers can publish events using HTTPS or AMQP 1.0 or Kafka 1.0 and later. Event publishers use a Shared Access Signature (SAS) token to identify themselves to an event hub, and can have a unique identity, or use a common SAS token.

    Event Hubs Capture enables you to automatically capture the streaming data in Event Hubs and save it to your choice of either a Blob storage account, or an Azure Data Lake Service account. You can enable Capture from the Azure portal, and specify a minimum size and time window to perform the capture. Using Event Hubs Capture, you specify your own Azure Blob Storage account and container, or Azure Data Lake Service account, one of which is used to store the captured data. Captured data is writ...

    Event Hubs provides message streaming through a partitioned consumer pattern in which each consumer only reads a specific subset, or partition, of the message stream. This pattern enables horizontal scale for event processing and provides other stream-focused features that are unavailable in queues and topics.A partition is an ordered sequence of events that is held in an event hub. As newer events arrive, they are added to the end of this sequence. A partition can be thought of as a \\"commit...

    Event Hubs uses Shared Access Signatures, which are available at the namespace and event hub level. A SAS token is generated from a SAS key and is an SHA hash of a URL, encoded in a specific format. Using the name of the key (policy) and the token, Event Hubs can regenerate the hash and thus authenticate the sender. Normally, SAS tokens for event publishers are created with only send privileges on a specific event hub. This SAS token URL mechanism is the basis for publisher identification int...

    Any entity that reads event data from an event hub is an event consumer. All Event Hubs consumers connect via the AMQP 1.0 session and events are delivered through the session as they become available. The client does not need to poll for data availability.

    For more information about Event Hubs, visit the following links: 1. Get started with an Event Hubs tutorial 2. Event Hubs programming guide 3. Availability and consistency in Event Hubs 4. Event Hubs FAQ 5. Event Hubs samples

  4. Azure Quickstart - Create an event hub using the Azure portal ...

    docs.microsoft.com/en-us/azure/event-hubs/event...

    To create an event hub within the namespace, do the following actions: On the Event Hubs Namespace page, select Event Hubs in the left menu. At the top of the window, click + Event Hub. Type a name for your event hub, then click Create. You can check the status of the event hub creation in alerts.

  5. azure.eventhub package — Azure SDK for Python 2.0.0 documentation

    azuresdkdocs.blob.core.windows.net/$web/python/...

    fully_qualified_namespace (str): The fully qualified namespace that the Event Hub belongs to. The format is like “<namespace>.servicebus.windows.net”. eventhub_name (str): The name of the specific Event Hub the checkpoints are associated with, relative to the Event Hubs namespace that contains it.

  6. Quotas and limits - Azure Event Hubs - Azure Event Hubs ...

    docs.microsoft.com/en-us/azure/event-hubs/event...

    Number of Event Hubs namespaces per subscription-100: Number of event hubs per namespace: Subsequent requests for creation of a new event hub are rejected. 10: Number of partitions per event hub-32: Size of an event hub name-256 characters: Size of a consumer group name-256 characters: Number of non-epoch receivers per consumer group-5

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  8. Azure Event Grid vs Event Hub Comparison | Serverless360

    www.serverless360.com/blog/azure-event-grid-vs...
    • Event
    • Messages
    • Definition
    • When to Use
    • Real-Time Scenario
    • Monitoring Options For Event Hubs and Event Grid
    • Event Publisher/Source
    • Event Handler/Subscriber
    • Batching
    • Security

    An event is a lightweight notification of a condition or a state change. The publisher of the event has no expectation about the consumer and how the event is handled. The consumer of the event decides what to do with the notification. Event is of two types: 1. Discrete 2. Series

    In short, a message is raw data produced by a service to be consumed or stored elsewhere. With the above understanding of the Events and Messages, let us now jump into the actual topic.

    Event Hubs

    Event Hubs is a fully managed, real-time data ingestion service that is simple, trusted and scalable. It streams millions of events per second from any source to build dynamic data pipelines and immediately respond to business challenges.

    Event Grid

    Azure Event Grid allows you to easily build applications with event-based architectures. First, select the Azure resource you would like to subscribe to, and then give the event handler or Webhook endpoint to send the event to.

    Event Hubs

    This service can be used when your application deals with the series of events and when you think your application might need a massive scale at least in the future, say a million events and to handle the data that also comes along with the event.

    Event Grid

    This service can be used when your application deals with discrete events. Predominantly, when there is a need for your application to work in a publisher/subscriber model and to handle event but not the data, unlike Event Hubs.

    Let us consider, a real-time e-commerce scenario and see where these two services, Azure Event Grid and Event Hubs fit in.

    Azure Monitor

    You can monitor metrics overtime in the Azure portal. The following picture depicts the view of successful requests and incoming requests at the account level: Also, it is possible to monitor the metrics via namespace of the Event Hubs.

    Event Grid Monitoring

    Data monitor can be configured with appropriate metrics to monitor Event Grid Topics and Subscriptionin various perspectives like efficiency and performance.

    Event Hubs

    The publisher can be anything which sends telemetry of events to the Event Hubs.

    Event Grid

    The event source of the Event Grid can be of any one of the following: 1. Azure Subscriptions (management operations) 2. Container Registry 3. Custom Topics 4. Event Hubs 5. IoT Hub 6. Media Services 7. Resource Groups (management operations) 8. Service Bus 9. Storage Blob 10. Azure Maps

    Event Hubs

    Having multiple handlers or listeners in Event Hubs listening to the same partition is a bit tricky. If you straight away assign all the recipients to the same consumer group that listen to the same partition, then duplicate events will be received by the event handlers. You need to assign each listener to a unique consumer group.

    Event Grid

    The event subscribers of the Event Grid can be of any one of the following: 1. Azure Automation 2. Azure Functions 3. Event Hubs 4. Hybrid Connections 5. Logic Apps 6. Microsoft Flow 7. Queue Storage 8. Service Bus (Preview) 9. Webhooks (anything)

    Event Hubs

    Using the batch option available in Event Hubs, one can send a new batched message event to an Event Hub. Batching reduces the number of messages that are transmitted by merging information from multiple messages into a single batch of messages. This reduces the number of connections established and network bandwidth by minimizing the number of packet headers that are sent over the network.

    Event Grid

    When using a custom topic, events must always be published in an array. This can be a single batch for low-throughput scenarios, however, for high volume use cases, it’s recommended that you batch several events together per publish to achieve higher efficiency. Batches can be up to 1 MB. Each event should still not be greater than 64 KB (General Availability) or 1 MB (preview).

    Event Hubs

    The Advanced Message Queuing Protocol 1.0 is a standardized framing and transfer protocol for asynchronously, securely, and reliably transferring messages between two parties. It is the primary protocol of Azure Service Bus Messaging and Azure Event Hubs. Both services also support HTTPS.

    Event Grid

    Event Grid provides security for subscribing to topics, and publishing topics. When subscribing, you must have adequate permissions on the resource or event grid topic. When publishing, you must have a SAS token or key authentication for the topic.

  9. Pricing - Event Hubs | Microsoft Azure

    azure.microsoft.com/en-us/pricing/details/event-hubs

    Event Hubs capture is enabled when any event hub in the namespace has the capture feature enabled. Capture is billed hourly per purchased throughput unit. As the throughput unit count is increased or decreased, Event Hubs capture billing will reflect these changes in whole hour increments.

  10. Azure Event Hubs vs Service Bus Comparison | Serverless360

    www.serverless360.com/blog/azure-event-hubs-vs...

    Aug 05, 2019 · Event Hub is one of the messaging systems in Azure that provides a key capability of multiple sender/receiver concept. So, what it basically does which differentiates from other messaging systems is that it allows the “Senders” to pass a message with high throughput and streamlines it in the partitions which are available in the Event Hubs.

  11. Event Hubs—Real-Time Data Ingestion | Microsoft Azure

    azure.microsoft.com/en-us/services/event-hubs

    Event Hubs is a fully managed, real-time data ingestion service that’s simple, trusted, and scalable. Stream millions of events per second from any source to build dynamic data pipelines and immediately respond to business challenges.

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