Simplifying Continuous Data Processing Using Stream Native Storage In Pravega with Tom Kaitchuck - Episode 63


December 31st, 2018

44 mins 42 secs

Your Host

About this Episode


As more companies and organizations are working to gain a real-time view of their business, they are increasingly turning to stream processing technologies to fullfill that need. However, the storage requirements for continuous, unbounded streams of data are markedly different than that of batch oriented workloads. To address this shortcoming the team at Dell EMC has created the open source Pravega project. In this episode Tom Kaitchuk explains how Pravega simplifies storage and processing of data streams, how it integrates with processing engines such as Flink, and the unique capabilities that it provides in the area of exactly once processing and transactions. And if you listen at approximately the half-way mark, you can hear as the hosts mind is blown by the possibilities of treating everything, including schema information, as a stream.


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  • Your host is Tobias Macey and today I’m interviewing Tom Kaitchuck about Pravega, an open source data storage platform optimized for persistent streams


  • Introduction
  • How did you get involved in the area of data management?
  • Can you start by explaining what Pravega is and the story behind it?
  • What are the use cases for Pravega and how does it fit into the data ecosystem?
    • How does it compare with systems such as Kafka and Pulsar for ingesting and persisting unbounded data?

  • How do you represent a stream on-disk?

    • What are the benefits of using this format for persisted streams?

  • One of the compelling aspects of Pravega is the automatic sharding and resource allocation for variations in data patterns. Can you describe how that operates and the benefits that it provides?

  • I am also intrigued by the automatic tiering of the persisted storage. How does that work and what options exist for managing the lifecycle of the data in the cluster?

  • For someone who wants to build an application on top of Pravega, what interfaces does it provide and what architectural patterns does it lend itself toward?

  • What are some of the unique system design patterns that are made possible by Pravega?

  • How is Pravega architected internally?

  • What is involved in integrating engines such as Spark, Flink, or Storm with Pravega?

  • A common challenge for streaming systems is exactly once semantics. How does Pravega approach that problem?

    • Does it have any special capabilities for simplifying processing of out-of-order events?

  • For someone planning a deployment of Pravega, what is involved in building and scaling a cluster?

    • What are some of the operational edge cases that users should be aware of?

  • What are some of the most interesting, useful, or challenging experiences that you have had while building Pravega?

  • What are some cases where you would recommend against using Pravega?

  • What is in store for the future of Pravega?

Contact Info

Parting Question

  • From your perspective, what is the biggest gap in the tooling or technology for data management today?


The intro and outro music is from The Hug by The Freak Fandango Orchestra / CC BY-SA

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