Big Data Technologies: Spark Processing II

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Questions and Answers

What type of variable is a broadcast variable in Spark?

Global variable
Immutable shared variable (correct)
Private variable
Mutable shared variable

How does Spark initially send the broadcast variable across the cluster?

Using the driver as the only source (correct)
Using a round-robin approach
Using all worker nodes as sources simultaneously
Using a master-slave communication model

What protocol does Spark use for sending broadcast variables across the cluster?

FTP protocol
BitTorrent-like protocol (correct)
HTTP protocol
SSH protocol

How are broadcast variables created in Spark?

<p>$Broadcast$ $broadcastVar = sc.broadcast(new ext{ }int[] ext{ }{1, 2, 3});$ (B)</p> Signup and view all the answers

What is the purpose of using broadcast variables in Spark?

<p>To efficiently distribute large read-only datasets to worker nodes (A)</p> Signup and view all the answers

Flashcards

What is a broadcast variable in Spark?

A variable in Spark that is shared across all executors and is immutable, meaning it cannot be changed after creation.

How is a broadcast variable initially distributed in Spark?

Initially, the driver program is responsible for sending the broadcast variable to all worker nodes in the Spark cluster.

What protocol is used to distribute broadcast variables in Spark?

Spark uses a BitTorrent-like protocol for distributing broadcast variables across the cluster, enabling efficient peer-to-peer data sharing.

How do you create a broadcast variable in Spark?

To create a broadcast variable in Spark, you use the sc.broadcast() method, passing the data you want to share. For example: val broadcastVar = sc.broadcast(Array(1, 2, 3)).

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Why use broadcast variables in Spark?

Broadcast variables help avoid unnecessary data duplication across worker nodes, improving efficiency by allowing each node to access a shared copy of the data instead of each worker having its own copy.

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