jonkrohn

oza

Presto source code reading #1

• This document is created for Presto Source Code Reading #1.
  • http://atnd.org/events/47149
• Target: trunk code, Feb 10th, 2014
  • Main Topic: Coordinator and Executor ./presto-main/src/main/java/com/facebook/presto/executions
  • http://www.slideshare.net/frsyuki/hadoop-source-code-reading-15-in-japan-presto/10
• NOTE
  1. All source code noted here is quoted from https://github.com/facebook/presto. License bases on https://github.com/facebook/presto/blob/master/LICENSE.
  2. This document can include something wrong. Pull requests to fix them are always welcome :-)

frsyuki

Presto connector development 1

One of the very good design decisions Presto designers made is that it's loosely coupled from storages.

Presto is a distributed SQL executor engine, and doesn't manager schema or metadata of tables by itself. It doesn't manage read data from storage by itself. Those businesses are done by plugins called Connector. Presto comes with Hive connector built-in, which connects Hive's metastore and HDFS to Presto.

We can connect any storages into Presto by writing connector plugins.

Plugin Architecture

komiya-atsushi

import org.apache.commons.math3.distribution.ChiSquaredDistribution;
import org.apache.commons.math3.stat.inference.ChiSquareTest;
import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;

import java.util.Arrays;
import java.util.List;

/**
 * カイ二乗検定を用いた検証を行う BaseMatcher 継承クラスです。