March 2021
Intermediate to advanced
265 pages
6h 50m
Chinese
Content preview from Presto实战
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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.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.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.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.
211
第 12章
生产环境中的
Presto
在学习
Presto
的过程中，第
2
章介绍了探索性安装
Presto
的简单方法，第
5
章介绍了
Presto
的部署
，而这一章将更进一步地深入细节。毕竟，仅仅安装和配置集群与维持其长
时间运行非常不同，后者具有不同的用户、不断变化的数据源和完全独立的用法。
因此，这一章将进一步探索
Presto
集群操作者必备的其他方面的知识。
12.1
使用
Presto Web UI
监控
如
3.5
节所述，你可以在每个
Presto
集群的协调器上访问到其
Web UI
，它可以用来检查和
监控
Presto
集群及其处理的查询。
W
ebUI
所提供的细节信息可用于帮你更好地理解和调优
Presto
的整体系统以及单个查询。
Presto
的
WebUI
暴露的信息来自
Presto
的系统表，在
8.2
节中有详细介绍。
当你第一次访问
PrestoWeb UI
所在地址时，可以看到如图
12-1
所示的主仪表盘，其上方
显示
Presto
集群的信息，下方显示查询列表。
212
｜
第
12
章
图 12-1：Presto Web UI 的主仪表盘
12.1.1
集群级的细节
下面先来讨论
Presto
集群的信息。
运行中的查询
Presto
集群中当前正在运行的查询总数
。所有用户的查询都会计入，例如，
Alice
运行
着
2
个查询且
Bob
运行着 ...
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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.