March 2018
Beginner to intermediate
332 pages
6h 1m
Korean
Content preview from 9가지 사례로 익히는 고급 스파크 분석(2판): 현실 세계 빅데이터로 배우는 데이터 과학과 머신러닝
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57
2
장
스칼라와 스파크를 활용한 데이터 분석
을 통해서 하이브 메타스토어에 연결할 수 있으며
Builder
API
SparkSession
의
enable
HiveSupport
메서드를 호출하여
HiveQL
도 사용할 수 있다.
val sparkSession = SparkSession.builder.
master("local[4]")
.enableHiveSupport()
.getOrCreate()
스파크
2
.
x
에서는 하이브 메타스토어에 있는 모든 테이블을 데이터프레임으로 처리하고, 메
타스토어에 정의된 테이블에
Spark
SQL
질의를 수행하고, 하이브나 임팔라
Apache
Impala
, 프
레스토
Presto
등 다른 도구로도 이어서 질의가 가능하도록
Spark
SQL
질의의 결과를 메타스
토어에 저장할 수 있다.
2.9
데이터프레임에 대한 빠른 요약 통계
SQL
을 사용하건
DataFrame
API
를 사용하건 동등하게 잘 표현할 수 있는 분석 작업의 종류
도 많지만, 어떤 일들은
SQL
로 작업하면 지루한 일을 반복해야 해서 데이터프레임으로 할 수
있었으면 하는 그런 영역도 있다. 이중에
DataFrame
API
가 특히 도움되는 작업으로 데이터
프레임의 수치 열에 있는 유효한 모든 값에 대해서 최솟값, 최댓값, 평균 및 표준편차를 구하는
작업이 있다.
R
에서
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.