The columnar roadmap: Apache Parquet and Apache Arrow

Thursday, June 21
9:30 AM - 10:10 AM
Executive Ballroom 210B/F

The Hadoop ecosystem has standardized on columnar formats—Apache Parquet for on-disk storage and Apache Arrow for in-memory. With this trend, deep integration with columnar formats is a key differentiator for big data technologies. Vertical integration from storage to execution greatly improves the latency of accessing data by pushing projections and filters to the storage layer, reducing time spent in IO reading from disk, as well as CPU time spent decompressing and decoding. Standards like Arrow and Parquet make this integration even more valuable as data can now cross system boundaries without incurring costly translation. Cross-system programming using languages such as Spark, Python, or SQL can becomes as fast as native internal performance.

In this talk we’ll explain how Parquet is improving at the storage level, with metadata and statistics that will facilitate more optimizations in query engines in the future. We’ll detail how the new vectorized reader from Parquet to Arrow enables much faster reads by removing abstractions as well as several future improvements. We will also discuss how standard Arrow-based APIs pave the way to breaking the silos of big data. One example is Arrow-based universal function libraries that can be written in any language (Java, Scala, C++, Python, R, ...) and will be usable in any big data system (Spark, Impala, Presto, Drill). Another is a standard data access API with projection and predicate push downs, which will greatly simplify data access optimizations across the board.

Presentation Video


Julien Le Dem
Principal Engineer
Julien Le Dem is the coauthor of Apache Parquet and the PMC chair of the project. He is also a committer and PMC Member on Apache Pig, Apache Arrow and a few others. Julien is a Principal Engineer at WeWork and was previously Architect at Dremio and tech lead for Twitter’s data processing tools, where he also obtained a two-character Twitter handle (@J_). Prior to Twitter, Julien was a principal engineer and tech lead working on content platforms at Yahoo, where he received his Hadoop initiation. His French accent makes his talks particularly attractive.