Spark Broadcast Variables Explained

Broadcast variables are a type of distributed shared variable used to maintain a read-only copy of a variable on all nodes in a cluster. This allows for the use of the same variable on all nodes, avoiding the cost of replicating the variable in each task, improving performance, and reducing memory usage. In Spark, broadcast variables are read-only, meaning once created, their value cannot be modified. They are typically used to broadcast larger datasets or model parameters to all nodes for use in the computation process.