March 2021
Intermediate to advanced
265 pages
6h 50m
Chinese
Content preview from Presto实战
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高级连接器实例
｜
97
connector.name=phoenix
phoenix.connection-url=jdbc:phoenix:zookeeper1,zookeeper2:2181:/hbase
连接
URL
是指向数据库的
JDBC
连接串。它包括一个
Apache ZooKeeper
节点的列表，用
于发现
HBase
节点。
Phoenix
的
schema
和表被映射到
Presto
的
schema
和表，可以用以下
Presto
语句来查看：
SHOW SCHEMAS FROM bigtable;
SHOW TABLES FROM bigtable.example;
SHOW COLUMNS FROM bigtable.examples.user;
现在你可以查询任何
HBase
表，并在下游工具中使用它们，就像从任何
Presto
的其他数据
源取得数据一样。
使用
Presto
可以让你利用其水平扩展的性能优势来查询
HBase
。你可以创建任何查询来
访问
HBase
和其他
catalog
，并且能够将
HBase
与其他数据源的数据结合起来进行联邦
查询。
7.2
键值存储连接器示例
：
Accumulo
Presto
包含多个键值数据存储的连接器。
键值存储系统
用于管理记录存储的字典，并允许
通过唯一的键来检索某条记录。想想散列表，其中的记录是通过一个键来检索的，这条记
录可以是单值、多值甚至集合。
目前有几种键值存储系统。其中一个广泛使用的系统是开源、宽列存储数据库
Apache
Cassandra
，它有一个
Presto
连接器。你可以在 ...
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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.