conor-23 · HackerTrans

One of the Hydro creators here. Ballista (and the ecosystem around Arrow and Parquet) are much more focused on analytical query processing whereas Hydro is bringing the concepts from the query processing world to the implementation of distributed systems. Our goal isn't to execute a SQL query, but rather to treat your distributed systems code (e.g a microservice implementation) like it is a SQL query. Integration with Arrow and Parquet are definitely planned in our roadmap though!

conor-23

tahun laludiscuss

There is a nice talk on Youtube explaining the Hydro project (focused mostly on DFIR)

https://www.youtube.com/watch?v=YpMKUQKlak0&ab_channel=ACMSI...

conor-23

tahun laludiscuss

One of the creators of Hydro here. Yeah, one way to think about Hydro is bringing the dataflow/query optimization/distributed execution ideas from databases and data science to programming distributed systems. We are focused on executing latency-critical longrunning services in this way though rather than individual queries. The kinds of things we have implemented in Hydro include a key-value store and the Paxos protocol, but these compile down to dataflow just like a Spark or SQL query does!

conor-23

tahun laludiscuss

There is a nice article by David Patterson (who used to direct the lab and won the Turing Award) on why Berkeley changes the name and scope of the lab every five years https://www2.eecs.berkeley.edu/Pubs/TechRpts/2013/EECS-2013-... . Unfortunately, there's no good name for the lab across each of the five-year boundaries so people just say "rise lab" or "amp lab" etc.

conor-23

3 tahun yang laludiscuss

This dudes blog is fire. Very nice explanations of complex database topics.

conor-23

3 tahun yang laludiscuss

Yeah I'm not up on the Prolog history side of things. My info is based on the Wikipedia article for Fixed Point Logic: "Least fixed-point logic was first studied systematically by Yiannis N. Moschovakis in 1974,[1] and it was introduced to computer scientists in 1979, when Alfred Aho and Jeffrey Ullman suggested fixed-point logic as an expressive database query language.[2]" [2] = Universality of Data Retrieval Languages : https://dl.acm.org/doi/10.1145/567752.567763

conor-23

3 tahun yang laludiscuss

A researchy perspective: Datalog was invented to extend relational algebra with recursion. Since it started out as an academic tool, people have been studying recursion-specific optimizations you can do for decades so it is extremely well suited to recursive use-cases e.g. iterative graph algorithms. Using Datalog for network algorithms won the thesis award in databases almost 20 years ago https://boonloo.cis.upenn.edu/papers/boon_interview.pdf .

conor-23

3 tahun yang laludiscuss

Frank is a legend. Should put him in the Guinness Book.

conor-23

4 tahun yang laludiscuss

Author here. Happy to answer any questions. - Conor

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