Answer / Neelam

Speculative Execution in Apache Spark is a method used to improve the performance of tasks. When a task fails, Spark automatically executes the same task again on another worker node to ensure that the work gets done. This approach helps in reducing task completion time and improves overall system throughput.

Why we need compression and what are the different compression format supported?

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What is spark sqlcontext?

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What is accumulator?

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What according to you is a common mistake apache spark developers make when using spark ?

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Name three data source available in SparkSQL

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Explain the use of broadcast variables

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What is broadcast variable?

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Explain the level of parallelism in Spark Streaming? Also, describe its need.

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Do streamers make money from sparks?

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What are the different ways of representing data in Spark?

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Name commonly-used Spark Ecosystems

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What is Apache Spark Streaming?

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