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Composable Parallel Processing in Apache Spark and Weld

Matei Zaharia | Databricks & Stanford


The main reason people are productive writing software is composability -- engineers can take libraries and functions written by other developers and easily combine them into a program. However, composability has taken a back seat in early parallel processing APIs. For example, composing MapReduce jobs required writing the output of every job to a file, which is both slow and error-prone. Apache Spark helped simplify cluster programming largely because it enabled efficient composition of parallel functions, leading to a large standard library and high-level APIs in various languages. In this talk, I'll explain how composability has evolved in Spark's newer APIs, and also present a new research project I'm leading at Stanford called Weld to enable much more efficient composition of software on emerging parallel hardware (multicores, GPUs, etc). 

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Matei zaharia

Assistant Professor, CS at Stanford | Co-Founder of Databricks

Matei Zaharia is an assistant professor of computer science at Stanford and Chief Technologist of Databricks. He started the Spark project at UC Berkeley and continues to serve as its vice president at Apache. Matei also co-started the Apache Mesos project and is a committer on Apache Hadoop. Beyond datacenter systems, Matei also does research in security, networking and machine learning. Matei’s research work was recognized through two Best Paper awards and the 2014 ACM Doctoral Dissertation Award.


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