What is the fine-grained topic of the following text: In this talk, I'll take a deep dive into Spark's performance on two benchmarks (TPC-DS and the Big Data Benchmark from UC Berkeley) and one production workload and demonstrate that many commonly-held beliefs about performance bottlenecks do not hold. Only return the topic.
Spark's performance on TPC-DS and Big Data Benchmark and debunking performance bottleneck myths.