AD0-E722 Adobe Commerce Architect Master Questions and Answers

The issue here is that the customer session data is randomly being lost when flushing the Magento cache storage. This is because the Redis configuration for caches and session data might be using the same database number, which causes the session data to be deleted along with the caches. The solution is to check the app/etc/env.php file and make sure that the Redis configuration for caches and session data use different database numbers. This will prevent the session data from being affected by the cache operations. References: https://experienceleague.adobe.com/docs/commerce-cloud-service/user-guide/develop/deploy/redis.html?lang=en#configure-redis 1

This solution ensures that the new plugin will execute after all the existing plugins for the ServiceClass::getData method, and will be able to log the final result of the method execution. The afterGetData method of the new plugin will receive the result of the method as a parameter, and can use any logging mechanism to record it. The sortOrder value of the new plugin should be higher than the highest declared plugin sortOrder, so that it will run last in the sequence of plugins. The after type of plugin is preferred over the around type of plugin, because it is simpler and more efficient, and does not require calling the proceed() method.

References:

• Plugins (Interceptors) | Adobe Commerce Developer Guide
• Plugin best practices | Adobe Commerce Developer Guide

• Option A is correct because enabling asynchronous indexing can improve the checkout performance by reducing the database load and avoiding locking issues. Asynchronous indexing allows the indexers to run in the background without affecting the frontend operations. The command bin/magento config:set dev/grid/async_indexing 1 can be used to enable this option in the production mode1.
• Option C is correct because creating a new database and splitting the sales tables can also improve the checkout performance by distributing the database load and avoiding contention. Splitting the database allows the checkout and order management operations to use a separate master database from the rest of the Magento application tables. The command bin/magento setup:db-schema:split-sales --host="" --dbname="" --username="" --password="" can be used to configure this feature2.
• Option B is incorrect because enabling asynchronous email notifications does not affect the checkout performance directly. Asynchronous email notifications allow the order confirmation emails to be sent in batches by a cron job instead of immediately after placing an order. This option can reduce the server load and improve the customer experience, but it does not impact the checkout process itself3.
• Option D is incorrect because there is no such deploy mode as siege in Magento 2. The available deploy modes are default, developer, and production. Changing the deploy mode can affect the performance, caching, and error handling of the Magento application, but it does not directly affect the checkout performance4.
• Option E is incorrect because there is no such admin panel setting as multithreaded checkout processing in Magento 2. The number of PHP threads used for checkout is determined by the web server configuration and the PHP-FPM settings, not by the Magento application settings. Increasing the number of PHP threads may improve thecheckout performance, but it also requires more server resources and may cause other issues5.

References:

• 1: Asynchronous indexing | Adobe Commerce Developer Guide
• 2: Split database performance solution | Adobe Commerce Developer Guide
• 3: Sales Emails | Adobe Commerce User Guide
• 4: Set up Magento modes | Adobe Commerce Developer Guide
• 5: PHP-FPM configuration settings | Adobe Commerce Developer Guide

This solution ensures that the data returned by the GraphQL queries is up to date, while also maintaining performance. By specifying a $cache(cacheidentity: Path\To\identityclass) directive for each GraphQL query, the relevant brands and associated products will be added as cache tags. 

Option C is the correct solution because declaring a capture command with type Magento\Payment\Gateway\Command\NullCommand for the payment method command pool in di.xml will prevent the default capture logic from being executed. The NullCommand class is a dummy implementation of the CommandInterface that does nothing. This way, the payment capture will be handled by the PSP webhook, and the invoice will be created accordingly12

Option A is not a correct solution because adding a plugin before the $invoice->capture() and changing its input to prevent the call of the $payment->capture() will require modifying the core Magento code, which is not recommended. Moreover, this solution will affect all payment methods that use the invoice capture logic, not just the monthly installments payment extension3

Option B is not a correct solution because changing the can_capture attribute for the payment method under config.xml to be 0 will disable the capture functionality for the payment method entirely. This means that the invoice cannot be created or captured, even by the PSP webhook4

References:

1: https://experienceleague.adobe.com/docs/commerce-cloud-service/user-guide/payments-integrations/payment-gateway/gateway-command.html?lang=en  2: https://github.com/magento/magento2/blob/2.4-develop/app/code/Magento/Payment/Gateway/Command/NullCommand.php  3: https://experienceleague.adobe.com/docs/commerce-cloud-service/user-guide/customization/best-practices.html?lang=en#do-not-modify-core-code  4: https://experienceleague.adobe.com/docs/commerce-cloud-service/user- guide/payments-integrations/payment-gateway/payment-gateway-configuration.html?lang=en#payment-method-configuration

The group property determines which section of the customer account the attribute belongs to. By setting the group property to 1, the reward_card_number attribute will be assigned to the default group, which is the Account Information section. This will make the attribute available in the My account/My rewards page template. References: https://experienceleague.adobe.com/docs/commerce-admin/customers/customer-accounts/attributes/attribute-properties.html?lang=en#group 1

According to the Adobe Commerce documentation, OAuth-based authentication is the recommended method for integrations that need access to system resources, such as orders, customers, products, etc. OAuth-based authentication allows the merchant to control the access level and scope of the integration, as well as to revoke the access at any time using the admin panel. OAuth-based authentication also requires an OAuth handshake between the integration and the Adobe Commerce system during activation, which ensures a secure exchange of tokens and keys. The third-party system should follow the OAuth protocol to obtain and refresh the access token, which will be used as the Bearer Token to authorize the REST API calls.

References:

• Authentication | Adobe Commerce Developer Guide
• OAuth-based authentication | Adobe Commerce Developer Guide

• Option A is correct because enabling the config flag under deployment/blue_green/enabled is one of the steps to ensure zero downtime during the deployment process of Magento 2 on-premises. This flag enables the blue-green deployment feature, which allows deploying a new version of the Magento application to a separate environment (blue) without affecting the current live environment (green). Once the new version is ready, the traffic can be switched from green to blue with minimal or no downtime1.
• Option C is correct because running bin/magento setup:upgrade --keep-generated is another step to ensure zero downtime during the deployment process of Magento 2 on-premises. This command updates the database schema and data without deleting the generated code and static view files. This way, the Magento application can still serve requests from the cache while the database is being upgraded2.
• Option B is incorrect because running bin/magento setup:upgrade --dry-run=true does not upgrade the database, but only checks if there are any errors or conflicts in the database schema or data. This command can be used for testing purposes, but it does not affect the deployment process or the downtime3.
• Option D is incorrect because there is no such option as --convert-old-scripts-true for the bin/magento setup:upgrade command. This option does not exist in Magento 2 and does not have any effect on the deployment process or the downtime.
• Option E is incorrect because there is no such config flag as developer/zero_down_time/enabled in Magento 2. This flag does not exist in Magento 2 and does not have any effect on the deployment process or the downtime.

References:

• 1: Blue-green deployment | Adobe Commerce Developer Guide
• 2: Deploy Magento to production | Adobe Commerce Developer Guide
• 3: Command-line installation options | Adobe Commerce Developer Guide

The Architect can take the following steps to ensure validation of the configuration files with unique validation rules for the individual and merged files:

• Create validation rules in marketplace.schema.xsd. This file defines the structure and constraints of the XML elements and attributes for the marketplace.feeds.xml configuration file. The Architect can use this file to specify the required and optional elements, data types, values, and patterns for the configuration file.
• Provide schema to validate a merged file. This schema is used to validate the final configuration file that is generated after merging all the individual configuration files from different modules. The Architect can use this schema to check the consistency and completeness of the merged configuration file.
• Provide schema to validate an individual file. This schema is used to validate each individual configuration file from each module before merging them. The Architect can use this schema to check the syntax and validity of each configuration file.

References: https://experienceleague.adobe.com/docs/commerce-cloud-service/user-guide/architecture/starter-architecture.html?lang=en#configuration-files 1 https://devdocs.magento.com/guides/v2.4/extension-dev-guide/build/XSD-XML-validation.html 2

• Option A is correct because updating the session host value to a shared Redis instance in the “app/etc/env.php” file will allow the session to be saved properly and prevent users from being redirected to the sign-in page after logging in. Redis is a fast and reliable in-memory data store that can be used for session storage in Magento 2. By using a shared Redis instance, the session data can be accessed by any of the backend web servers behind the load balancer, regardless of which server handled the initial request. This ensures that the user’s session is maintained and consistent across different servers1.
• Option B is incorrect because increasing the session size with the command config:set system/security/max_session_size_admin will not solve the issue of session not being saved properly. This command only affects the admin session size limit, not the customer session size limit. Moreover, this command does not address the root causeof the issue, which is that the session data is not shared among the backend web servers2.
• Option C is incorrect because utilizing the Remote Storage module to synchronize sessions between the servers is not a viable solution for this issue. The Remote Storage module is a feature of Magento Commerce Cloud that allows storing media files and other static content on a remote storage service such as AWS S3 or Azure Blob Storage. This module does not support synchronizing sessions between servers, as sessions are dynamic and transient data that need to be stored in a fast and accessible data store such as Redis3.

References:

• 1: Use Redis for session storage | Adobe Commerce Developer Guide
• 2: Security | Adobe Commerce User Guide
• 3: Remote storage | Adobe Commerce Developer Guide

To display additional content on the home page based on a custom customer attribute, the Architect needs to do the following steps:

• Add a new context value of “my_attribute” to Magento\Framework\App\Http\Context. This will allow the Full Page Cache to generate different versions of the page for customers with different values of “my.attribute”. The context value can be set using a plugin on the Magento\Customer\Model\Context class.
• Add a dynamic block with the content to the Home Page. A dynamic block is a type of content block that can be configured to display only to specific customer segments or conditions. The Architect can use the ‘my.attribute’ in the conditions of the dynamic block and assign it to the Home Page in the Content > Blocks section of the Admin Panel. References:
• Private content | Magento 2 Developer Documentation
• Dynamic Blocks | Adobe Commerce 2.3 User Guide - Magento