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Panagiotis Garefalakis

My name is Panagiotis (Panos) Garefalakis and I am currently part of the engineering team at Cloudera, working on query runtime optimizations for the Data Warehouse (CDW) cloud-native product. Big part of my work is available as open-source, contributed as part of Apache Hive, ORC, and Tez projects. My current interests lie within the broad area of systems including large-scale distributed systems, cluster resource management, and distributed query processing.

I obtained my PhD degree in Computer Science from Imperial College London, in 2020, under the supervision of Peter Pietzuch. At Imperial I was affiliated with the Large-Scale Data & Systems (LSDS) group and my PhD was supported by a CDT HiPEDS scholarship. Prior to that, I was a graduate research assistant at FORTH-ICS affiliation in Greece. I received my Master (MSc) and Bachelor (BSc) degrees in Computer Science from University of Crete under the supervision of Kostas Magoutis.


  • Giving a talk about the new Hive runtime filtering enhancements at ApacheCon'2029 Sep 2020
  • Successfully defended my PhD thesis!!24 Jun 2020
  • Joined Cloudera as a Senior Software Engineer01 Nov 2019
  • NEPTUNE, a framework scheduling unified applications was accepted at SoCC'1902 Sep 2019
  • Presenting our framework for cooperative task execution at Spark AI Summit'1923 Apr 2019
  • Giving a talk about efficient scheduling at the annual System Challenges Workshop21 Mar 2018
  • MEDEA, a cluster scheduler for long-running containers was accepted at EuroSys'1825 Feb 2018
  • Summer Internship with CISL group at Microsoft in Sunnyvale, CA12 Jun 2017
  • Summer Internship with CISL group at Microsoft in Mountain View, CA03 Jun 2016
  • Presenting our demo paper Java2SDG at ICDE'16 conference16 May 2016

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