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NEW QUESTION # 91
What is the role of an Operator in an Apache Airflow DAG?
A To schedule DAG runs based on time or external triggers
Answer: C
Explanation:
In Apache Airflow, an Operator represents a single task or a step within a DAG, defining what actually gets done by a task. Operators are the building blocks of a DAG, specifying the type of work that needs to be done, such as running a Python function, executing a SQL command, or transferring data.
NEW QUESTION # 92
In an Airflow DAG, you have tasks A, B, C, and D. Task A must complete before B and C can start, but B and C can run in parallel. Task D should only run once both B and C have completed. How do you set up these dependencies?
Answer: B
Explanation:
NEW QUESTION # 93
Considering the dynamic nature of data workloads, how can Spark's dynamic resource allocation feature impact caching strategies?
Answer: D
Explanation:
Spark's dynamic resource allocation can impact caching strategies by potentially evicting cached data when executors are removed due to reduced workload. This feature adjusts the cluster size based on the workload, adding or removing executors dynamically. While it optimizes resource utilization, it may lead to the eviction of cached data if executors holding that data are decommissioned, which can affect performance if the data needs to be recomputed or fetched again.
NEW QUESTION # 94
In the context of Cloudera's Optimization Framework, what role does data statistics collection play?
Answer: D
Explanation:
Collecting data statistics (like row counts, data distribution, and column cardinality) is crucial for the optimizer. It uses these statistics to make informed decisions about the most efficient way to execute queries, including data layout and choosing the best execution plan.
NEW QUESTION # 95
Which security feature offered by the Cloudera Data Engineering service allows granular access control to data pipelines and resources?
Answer: A
Explanation:
Apache Ranger, integrated with the Cloudera Data Engineering service, provides fine-grained authorization and access control capabilities for data pipelines and resources. It allows admins to define who has access to specific data assets and operations within the platform.
NEW QUESTION # 96
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