March 2021
Intermediate to advanced
265 pages
6h 50m
Chinese
Content preview from Presto实战
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92
｜
第
6
章
其中一些数据源提供了类似
SQL
的查询语言，如
Apache Cassandra
的
CQL
；另一些则只
提供了特定的工具或
API
来
访问数据，或者使用完全不同的查询语言，如
Elasticsearch
中
使用的
DSL
（
domain
specific language
）查询。这些语言只具有有限的完备性并且没有标
准化。
这些
NoSQL
数据
源的
Presto
连接器允许你在这些系统上运行
SQL
查询，就像关系数据源
一样。这使得你可以使用商业智能工具等应用程序，或者允许懂
SQL
的人查询这些数据
源。这包括在这些数据源上使用
Join
、聚合、子查询和其他高级
SQL
功能。
你将在第
7
章中了解到更多关于这些连接器的内容。
• NoSQL
系统，如
Elasticsearch
或
MongoDB
（参见
7.5
节
）。
•
流系统，如
ApacheKafka
（参见
7.4
节
）。
•
键值存储系统，如
Apache
Accumulo
（参见
7.2
节）和
ApacheCassandra
（参见
7.3
节 ）。
•
用于
ApacheHBase
的
ApachePhoenix
连接器（参见
7.1
节
）。
我们先跳过它们，讨论一些比较简单的连接器。
6.6
Presto JMX
连接器
JMX
连接器可以通过
catalog
属性文件
etc/catalog/jmx.properties
轻松配置使用。
connector.name=jmx
JMX
连接器公开了关于运行
Presto
协调器和工作节点的
JVM
的运行时信息。它使用
Java
管理扩展
（
Java
management ...
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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.