[Arch] SparkSQL Internals – Part 2: SparkSQL Data Flow

The paper of SparkSQL provides a very nice figure about SparkSQL data flow. I’ve had experiences on Apache Pig for more than one year so I realized that it is better to put them all together. I created a new figure that includes the data flow of Hive, Pig, and SparkSQL. I know a little … Continue reading [Arch] SparkSQL Internals – Part 2: SparkSQL Data Flow

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[Arch] SparkSQL Internals – Part 1: SQLContext

I assume that you’ve already read these documents about SparkSQL. Things that you should keep in your mind: DataFrame API: where relational processing meets procedural processing. Catalyst: extensible query optimizer which works on trees and rules, provides lazy optimization and is easy to extend/add a new rule. In this post, I will introduce to you … Continue reading [Arch] SparkSQL Internals – Part 1: SQLContext

[Sysdeg] Moving to SparkSQL, why not?

Maybe you still remember the draft design of the system I proposed here. The reason why I delayed posting the part-2, which mostly focuses on technical details, because Spark is new for me so I need time to dig more into it. However, the design won’t be changed so much, I think. Come back to … Continue reading [Sysdeg] Moving to SparkSQL, why not?

[Overview] Spark deploy modes

Spark has several deploy modes, this will affect the way our sparkdriver communicates with the executors. So, I want to say a little about these modes. Through Spark Deploy Mode document, we know that Spark has three deploy modes: Standalone: without having Yarn or Mesos, you can run your own cluster by starting a master … Continue reading [Overview] Spark deploy modes