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| Section | Objectives |
|---|---|
| Platform Operations | - Cluster and workload management
|
| Data Storage and Modeling | - Data lake architecture
|
| Data Processing and Transformation | - Spark processing
|
| Data Ingestion and Integration | - Data movement and pipelines
|
| Data Governance and Security | - Security frameworks
|
1. When writing a DataFrame to a CSV file, what potential issues should you consider and how can you address them?
A) No specific issues need to be considered, as CSV is a simple format
B) Choose an appropriate compression format like Gzip to reduce file size
C) Ensure proper handling of special characters and delimiters to avoid data corruption
D) All of the above
2. If you want to set a minimum and maximum number of Executor pods for a Spark application in Kubernetes, which pair of PySpark configuration settings would you use?
A) 'spark.executor.memory', 'spark.executor.memoryoverhead'
B) 'spark.kubernetes.container.image', 'spark.kubernetes.executor.limit.cores'
C) 'spark.dynamicAllocation.minExecutors', 'spark.dynamicAllocation.maxExecutors'
D) 'spark.executor.instances', 'spark.executor.cores'
3. How can you monitor the storage level and usage of persisted RDDs in your Spark application?
A) Use Spark's web UI and look for information under the "Storage" tab
B) Leverage Spark metrics like rdd.getStorageLevel() and rdd.getPersistedSize()
C) Manually analyze the Spark application code
D) All of the above
4. What is the impact of setting the Spark configuration spark.sql.autoBroadcastJoinThreshold to -1?
A) It automatically selects the optimal threshold for broadcasting based on the cluster's current workload.
B) It increases the threshold for choosing which table to broadcast in a join, potentially improving join performance.
C) It sets an unlimited threshold for broadcasting tables, which may cause out-of-memory errors.
D) It disables the broadcast join feature, forcing all joins to be shuffled joins.
5. When configuring a Hive table with bucketing, how does the choice of the bucketing column(s) influence query performance?
A) The bucketing column(s) should be chosen randomly to ensure a uniform distribution of data across buckets.
B) Selecting highly unique or skewed columns for bucketing can lead to uneven data distribution and potential performance bottlenecks.
C) Bucketing on columns that are frequently updated optimizes data modification operations and query performance.
D) The choice of bucketing column(s) has no impact on performance as long as the number of buckets is optimally chosen.
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: C | Question # 3 Answer: D | Question # 4 Answer: D | Question # 5 Answer: B |
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