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O'Reilly Platform
book
Presto实战
by
Matt Fuller
,
Manfred Moser
,
Martin Traverso
March 2021
Intermediate to advanced
265 pages
6h 50m
Chinese
Posts & Telecom Press
Content preview from
Presto实战
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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Publisher Resources
ISBN: 9787115560056