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AZ 204 > Develop Message-based Solutions > Flashcards

Develop Message-based Solutions Flashcards

1
Q

Azure Queue Storage

High level, what would a message based architecture look like?

A

(1) User Sends Order
(2) Message received by Order Queue
(3) Order Fullfillment Service recevies messages and processes
(4) Message send to Post-Order Queue
(5) Analytics Ingestion Service

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2
Q

Azure Storage Queue

Benefits of a message-based architecture

A

(1) Encourages application logic modularity
(2) Enables fault tolerance between modules
(reduces data loss)

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3
Q

Azure Storage Queue

Define the Azure Storage Queue

A

A fully-managed service that is a part of the Azure Storage suite that enables you to create durable and configurable message queues to enable application modularity and fault tolerance

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4
Q

Azure Storage Queues

What are the capabilities of the Azure Storage Queue?

A

(1) Requires an Azure Storage Account
(general purpose v2)
(2) Queues are created within a single storage account
(3) Supports messages up to 64 KiB in size
(4) Number of messages limited only by size of the storage account
(5) Supports a configurable time-to-live per message
(default is 7 days)

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5
Q

Azure Storage Queues *

What are the data redundancies?

A

(1) Locally Redundant Storage (LRS)
(2) Zone-Redundant Storage (ZRS)
(3) Geo-Redundant Storage (GRS)
(4) Geo-Zone Redundant Storage (GZRS)
(5) Read-Access Geo-Redundant Storage (RA-GRS)
(6) Read-Access Geo-Zone-Redundant Access (RA-GZRS)

Zone means data is stored in more than one data center within a zone

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6
Q

Azure Storage Queues

Security Features in Azure Storage Queues

A

(1) Data in queues is encrypted by default
(2) Azure Storage stored access policies can work with queues
(3) Interactions with queue data via HTTP or HTTPS
(4) Supports the following authorization approaches
(a) Shared Key
(b) Shared Access Signature
(c) Azure AD

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7
Q

Azure Storage Queues

What is the Visibility Timeout?

A

Messages are delivered to consumers, butr are not immediately deleted from the queue. However, messages will not be visibile in the queue until a period of time has passed from the initial delivery.

Messages delivered to the consumer are not immediately deleted from the queue.

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8
Q

Azure Storage Queues

Scalability (queue, message, message support)

A

(1) Single queue < 500 TiB
(2) Single message cannot exceed 64 KiB
(3) No more than 5 access policies
(4) A storage account can support up to 20,000 messages per second
(based on 1 KiB message size)
(5) A single queue can support 2000 messages per second
(based on 1 KiB message size)

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9
Q

Azure Storage Queue

How to Create, Delete, View, Delete all messages a Storage Queue using Azure CLI

A

Create a Queue
az storage queue create –name $myqueue
Delete a Queue
az storage queue delete –name $myqueue
**View Messages **
az storage message peek –queue-name $myqueue
Delete All
az storage message clear –queue-name $myqueue

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10
Q

Azure Service Bus

Definition of Azure Service Bus

A

Full managed enterprise message broker service that enables multiple modes of messaging with integrations for common messing systems including Java Message Service (JMS)

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11
Q

Types of Azure Service Bus Messaging

A

(1) queue
(2) Topics

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12
Q

Azure Service Bus

Features of Azure Service Bus

A

(1) Supports both HTTP/HTTPS and AMQP protocols
(2) Includes messaging for both queues and topics
(3) Supports 3 different tiers
(basic, standard, and premium)
(4) Supports advanced Configurability
(Ordering, Batching, DLQ or Dead-letter queue, and duplication detection)

Basic tier DOES NOT support Topics

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13
Q

Azure Service Bus

What are some key differences between Standard and Premium Tiers for Azure Service Bus?

A

(1) Pay as you go vs. Fixed based on messaging units
(2) Throughput is varialble vs Throughput is fixed based on messaging units
(3) Shared vs dedicated resources
(4) Auto scaling vs configuration of scaling
(5) 256 kb vs 1 mb messages
(6) No support for geo-disaster recovery or availability zones

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14
Q

Azure Service Bus

URL Makeup

A
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15
Q

Azure Service Bus

Message Ordering

A

Azure Service Bus supports FIFO ordering by leverage sessions. This is supported in queue and topcis but must be enabled on the queue or topic

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16
Q

Azure Service Bus

Differeances in Scaling between Standard and Premium

A

(1) Standard supports partitioning on Queues and Topics
(2) Partitioning not supported on Premium

(3) Partitioning enables seperate messagings stores and brokers for a single entity
(4) Can use partition keys to determine partition
(5) Without a partition key, a round-robin algorithm is used by Azure
(6) Transactions on a partitioned entity must use a partition key

17
Q

Azure Service Bus

What is the DLQ

A

Is supported in both Queues and Topics. This enables you to capture messages that were not processed during their lifetime, and act accordingly with those messages.
Can also configure notifications to inform of messages in the DLQ

18
Q

Azure Service Bus

Select a message solutions between Storage Queue and Azure Service Bus

A

Storage Queue
(1) Total needs > 80GB
(2) Logs needed for all transactions execute again the queue
(3) Need to track progress of message processing
(4) Messages are not more than 64 KiB
Azure Service Bus
(1) Needs support for receiving messages withoug polling (with AMQP 1.0)
(2) FIFO
(3) Duplicate detection
(4) Message support up to 256K (compared to 65 KiB)
(5) You need to support topic based notifications (one to many)
(6) Need to publish and consume in batches

19
Q

Azure Service Bus

Create a Service Bus Queue and Delete in Azure CLI

A

Create the Namespace
az servicebus namespace create –resource-group $rg –name $ns –location $loc
Create a Queue
az servicebus queue create –namespace-name $ns
Delete a Queues
az servicebus queue delete –namespace-name $ns

Currently the CLI doesnt have a way to view message like Storage Queues

20
Q

Azure Service Bus (following will most likely be covered within exam)

Explain the importance of Topics in Service Bus

A

(1) Enables a one-to-many relationship between messages and consumers
(2) A consumer creates a subscription to a topic
(3)** Subscriptions act as a dedicated queues for a subscriber with the configurtation options **
(Really act with the subscription and not the topic directly)
(4) Topics can be filtered by
(a) Boolean Filters
(b) SQL Filters
(c) Correlation Filters

21
Q

Azure Service Bus

Azure CLI commands to create a Topic

A

Create a Topic
az servicebus topic create –namespace-name $nsname –name $mytopic –resource-group $rgname
Delete a Topic
az servicebus topic delete –namespace-name $nsname –name $mytopic
Create a subscription
az servicebus topic subscription create –namespace-namce $nsname –name $mysubscription –topic-name $mytopic

AZ 204 (16 decks)

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