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  1. Overview of features - Azure Event Hubs - Azure Event Hubs ...
    • 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

  2. Microsoft Azure Event Hub Namespace

    Microsoft Azure Event Hub Namespace. Use this template to monitor Microsoft Azure Event Hubs performance and statistics counters, including requests, messages, errors, connections and traffic. For an overview of configuring Azure application monitoring templates, watch SolarWinds Lab #82 (Part 2). Prerequisites

  3. Adding Event Hubs to Namespace | Serverless Notes

    Aug 14, 2020 · In the previous tip around provisioning an Event Hub namespace you learned how to do that through the Azure Portal. The next step is to add one or more Event Hubs to the namespace. Through the overview tab you can click + Event Hub and a new pane will appear.

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    What is Azure Event Hub namespace?

    How to create a namespace in Event Hubs?

    What do I need for Azure Event Hub?

    What is an event hub?

  5. The tale of two Azure Hubs - IoT Hub and Event Hub
    • Business Problem
    • About Namespaces
    • Deploy Namespace
    • Deploy Event Hub
    • Namespace Management
    • Consumer Groups
    • Event Hub Management
    • Summary

    Our boss has asked us to investigate connecting the machines owned by Collegiate Vending, the cloud to capture soda product sales. The ultimate goal is to save the messages in an Azure SQL database for analysis and reporting. Our fictitious company has a contract to distribute Coca-Cola products and vending machines to various educational institutions in the United States of America. In aprior article, we created a PowerShell script to write messages to an Azure Event Hub using PowerShell and HTTPS. The diagram below depicts the data flow in our system. Today, our job is to create and configure an Azure Event Hub service for the test program that sends simulated soda machine telemetry to the hub. We need to have an understanding of event hub features before we can successfully deploy a hub.

    The event hub namespace is the logical parent object that can contain one or more event hubs. For those database administrators, a namespace is conceptually the same as a logical database server. It is a unique scoping container that can be reference by a fully qualified domain name (FQDN). Security can be given out at this level; However, I would not recommend it since the end application will have access to all hubs. The namespace deployment is part of the event hub creation when using the Azure Portal. There are two types of Event Hub offerings: single hub and clustered. The fictitious Collegiate Vendingcompany is only processing 200K records per hour. Therefore, the non-cluster deployment has plenty of horse power to handle this processing. The usual information is required to deploy the namespace object. Please see the next section for details. The following information is specific to this service: tier, throughput, and zone redundancy. The Azure Event Hub service has two tiers...

    Now that we are informed about the choices for the namespace, lets deploy the service for our company. A search of the Azure Marketplace brings up two offerings for event hub. Choose the non-clustered installation option. The typical overview page for a service is shown below. Links to documentation and pricing are informative for the first use. Choose the create button to continue the deployment. The image below shows the deployment of a namespace called ehns4tips2020. It is interesting to note that the FQDN contains the Thus, Azure Service Bus is the foundation of this service. The subscription – pay-as-you-go, resource group –rg4tips2020 and location – east us 2are entered to complete the basic information required by all Azure objects. Click the create button to move onto the next screen. We will need more background information about Event Hubs to finish the deployment selections. Publishers write events to the hub and subscribers read events from...

    The create event hub dialog box allows the user to pick the partition count and message retention period. I choose the maximum choices in the window shown below. You can set the partition count and message retention to 1 for this poof of concept. If you are using the deployment template from the Portal, choose okay to build both the namespace and hub at the same time. The message retention and capture options can be changed after deployment. The partition count is static for the lifetime of the object. Since the Collegiate Vendingcompany is thinking of branching out into snack machines, we want to deploy an additional event hub called ehub4tips2020-snacks. Just choose the "+ Event Hub" button on the overview page of the namespace to start the process. The above image shows two hubs that are associated with our namespace. In the next section, an overview of the screens (blades) dedicated to managing the namespace.

    The Azure portal is where management of the namespace can be done via a graphical user interface (GUI). I am going to break the menu into three parts (images) that can be easily commented on. Not all options are required in most use cases. The overview menu option is the most popular destination. It brings up the current use of the namespace capacity. During the holiday break, I was doing a lot of testing of a Python program connecting to the event hub using AMQP. The results of those tests are seen in the chart below. The access control (IAM) menu option allows for the assignment of Azure rights to users and groups. The typical rights of owner, contributor and readercan be assigned to the appropriate user or group. The Tags menu option is useful when companies want to assign charge backs to departments for use of the Azure Subscription. Many companies enter department, application, component and cost center as descriptive tags to the deployed Azure objects. The shared access polici...

    The publisher/subscriber mechanism of Event Hubs is enabled through consumer groups. A consumer group is a view (state, position, or offset) of an entire event hub. Consumer groups enable multiple consuming applications to each have a separate view of the event stream, and to read the stream independently at their own pace and with their own offsets. We will talk about offsets in a future article. The image below shows two consumer groups have access to the four partitions. In event processing, each application is considered a consumer. There is always a default consumer for each event hub. Going back to our proof of concept, we might want to have one consumer group for each our Azure Function applications. If we want to persist all messages to storage, we could create another consumer group for that effort.

    The Azure portal is where management of the events hubs can be done via a graphical user interface (GUI). The overview menu option displays metrics about requests, messages and throughputat the bottom of the page. These numbers should match the namespace metrics if one event hub is deployed. The summation of the event hub metrics should always equal the container (namespace) metrics. At the top of the page, the four most common menu actions are show as large push buttons. The connect menu brings the user to a screen that can be used to define access policy. Each policy can be granted manage, send, and listen rights. The image below shows a policy for our soda-app. This has been given read and write privileges. Double clicking the policy after definition brings up the SASPolicy. There are two different keys that can be used to connect to the event hub service. While some services have different end points, this service lists the same end point twice. The checkpoint menu brings the us...

    Today, we explored how to deploy and configure both a namespace and event hub for streaming data. It is important to choose certain parameters such as throughput units and partitions correctly at the start of a project. Changes to these properties will require the re-creation of the objects. The details about how to read from the event hub partition were briefly covered. The partition is maintained for N days of retention. That means that various offsets can be used when reading the hub. In the future, I will show how to use Python to read and write to the hub. I am choosing this language since many of the edge device run Linux. Adding Python to this operating system is very simple. The partitioned consumer model allows for the application to read or write to a particular partition. Thus, scale can be achieved through parallelism. If you have multiple applications using the same event hub, it is wise to create a separate consumer for each read. If we were using Event Hub for many Io...

  6. Getting Started with Eventhubs - Manage Event Hub Events - in ...

    Stream Azure Service Logs and Metrics for consumption through Event Hub. - Create a DocumentDB instance - Creates a Event Hub namespace and an Event Hub in it - Retrieve the root namespace authorization rule - Enable diagnostics on a existing cosmosDB to stream events to event hub. Running this Sample. To run this sample:

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

    An Event Hubs namespace provides a unique scoping container, in which you create one or more event hubs. To create a namespace in your resource group using the portal, do the following actions: In the Azure portal, and select Create a resource at the top left of the screen. Select All services in the left menu, and select star (*) next to Event Hubs in the Analytics category. Confirm that Event Hubs is added to FAVORITES in the left navigational menu.

  8. Pricing - Event Hubs | Microsoft Azure

    Azure Event Hubs is a fully-managed, real-time data ingestion service that is simple, secure, and scalable. Event Hubs lets you stream millions of events per second from any source so you can build dynamic data pipelines and respond to business challenges immediately. Keep data ingestion secure with geo-disaster recovery and geo-replication options.

  9. Frequently asked questions - Azure Event Hubs - Azure 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}

    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

  10. Set up diagnostic logs - Azure Event Hub - Azure Event Hubs ...
    • Enable Diagnostic Logs
    • Diagnostic Logs Categories
    • Archive Logs Schema
    • Operational Logs Schema
    • Event Hubs Virtual Network Connection Event Schema
    • Next Steps

    Diagnostic logs are disabled by default. To enable diagnostic logs, follow these steps: 1. In the Azure portal, navigate to your Event Hubs namespace. 2. Select Diagnostics settings under Monitoring in the left pane, and then select + Add diagnostic setting. 3. In the Category details section, select the types of diagnostic logsthat you want to enable. You'll find details about these categories later in this article. 4. In the Destination detailssection, set the archive target (destination) that you want; for example, a storage account, an event hub, or a Log Analytics workspace. 5. Select Save on the toolbar to save the diagnostics settings.New settings take effect in about 10 minutes. After that, logs appear in the configured archival target, in the Diagnostics logs pane.For more information about configuring diagnostics, see the overview of Azure diagnostic logs.

    Event Hubs captures diagnostic logs for the following categories: All logs are stored in JavaScript Object Notation (JSON) format. Each entry has string fields that use the format described in the following sections.

    Archive log JSON strings include elements listed in the following table: The following code is an example of an archive log JSON string:

    Operational log JSON strings include elements listed in the following table: The following code is an example of an operational log JSON string:

    Event Hubs virtual network (VNet) connection event JSON includes elements listed in the following table:

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