Dive into best practices for fine-tuning and enhancing Apache Spark job performance in this 25-minute video from Databricks. Explore real-world problem-solving techniques and learn how to optimize resources by adjusting parameters such as garbage collector selection, serialization, worker/executor numbers, data partitioning, and Java heap settings. Analyze Spark UI execution DAGs to identify bottlenecks, optimize joins, and manage partition sizes. Discover strategies for handling data skew, utilizing scheduling pools, and implementing fair scheduler. Gain insights into Spark SQL rollup best practices and learn which approaches to avoid for improved performance.