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Introducing Pandas UDFs for PySpark

A Two Sigma researcher introduces the Pandas UDFs feature in the upcoming Apache Spark 2.3 release, which substantially improves the performance and usability of user-defined functions (UDFs) in Python.

Archival Storage at Two Sigma

The author presents CelFS, Two Sigma’s geo-distributed file system. Although CelFS has scaled to serve tens of petabytes of data, it uses physical partitioning to provide quality of service guarantees, it has a high replication overhead, and cannot take advantage of outsourced cold storage The talk further describes our response to these limitations in Jaks, a new storage system to reduce the TCO of CelFS and serve as the backend for other systems at Two Sigma.