Explanation:
The default execution mode for Databricks Auto Loader is Directory Listing. In this mode, Auto Loader identifies new files by periodically listing the input directory. This approach does not require additional cloud infrastructure setup (unlike the File Notification mode, which uses cloud-specific services). New files are loaded incrementally and idempotently into the target Delta Lake table. Option A describes File Notification mode (non-default), while Option B incorrectly implies querying all files (not incremental). Option C references webhooks and inferred rules, which are not part of Auto Loader. Option D correctly describes the default Directory Listing behavior.
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What is the default execution mode of Databricks Auto Loader?
A
Cloud vendor-specific queue storage and notification services are configured to track newly arriving files; new files are incrementally and idempotently loaded into the target Delta Lake table.
B
New files are identified by listing the input directory; the target table is materialized by directly querying all valid files in the source directory.
C
Webhooks trigger a Databricks job to run anytime new data arrives in a source directory; new data are automatically merged into target tables using rules inferred from the data.
D
New files are identified by listing the input directory; new files are incrementally and idempotently loaded into the target Delta Lake table.