In the context of improving join performance in Spark, what does "salting" involve?

• A.Encrypting the data before performing a join
• B.Physically co-locating related data on the same node
• C.Adding a random prefix to keys to distribute skewed data more evenly
• D.Seasoning the data with random noise for privacy

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In a PySpark application running on Kubernetes, if one of the Executors fails to execute a task due to a node failure, what action does the Spark Driver take?

• A.It immediately shuts down the entire application.
• B.It requests Kubernetes to allocate more resources to the failed Executor.
• C.It reschedules the task on a different Executor.
• D.It pauses the application until the failed Executor is back online.

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What information does an "Explain Plan" typically provide in the context of SQL query optimization?

• A.The cost of the query in monetary terms
• B.The sequence of operations the database will perform to execute the query
• C.The names of users who have executed the query
• D.The expected time of query completion

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What command and parameters should be used to update an existing Spark job in the Cloudera Data Engineering (CDE. service to increase its executor memory using the CDE CLI?

• A.cde job update -name my-spark-job --conf spark.executor.memory=6g
• B.cde spark submit -update -name my-spark-job -executor-memory 6G
• C.cde job config -name my-spark-job -set spark.executor.memory=6g
• D.cde job run -edit my-spark-job -conf spark.executor.memory=6g

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What is the significance of "Sort Merge Join" appearing in an Explain Plan in Cloudera's SQL engines?

• A.It is the least preferred join method due to its high CPU usage
• B.It indicates that the query will benefit from additional indexes
• C.It signifies that the join operation is performed by sorting and then merging two datasets, which can be efficient for large, sorted datasets
• D.It suggests that the join operation is performed without sorting, leading to faster execution

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