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Discuss the challenges and solutions involved in scaling decision trees in a distributed environment like Spark. Specifically, address how Spark manages the potential issues of data imbalance, communication overhead, and synchronization during the parallel training of decision trees.
A
Spark does not address any of these issues and trains decision trees sequentially on a single node.
B
Spark uses data sampling techniques to handle data imbalance, minimizes communication overhead through efficient data partitioning, and employs synchronization mechanisms to ensure consistent training across nodes.
C
Spark only supports linear regression and does not address these issues for decision trees.
D
Spark relies on a centralized server to handle all data and training, avoiding these issues.