November 2021
Intermediate to advanced
410 pages
12h 1m
Chinese
Content preview from MongoDB权威指南（第3版）
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从应用程序连接副本集
｜
221
隐藏成员自己对剩下的工作进行处理。
假设有
5
个成员
，从
host0
到
host4
，其中
host4
是隐藏成员。我们希望确保写操作被同步
到大多数非隐藏成员上，即至少是
host0
、
host1
、
host2
和
host3
中的
3
个
。要为此创建规
则，首先要为非隐藏成员设置标签：
> var config = rs.config()
> config.members[0].tags = [{"normal" : "A"}]
> config.members[1].tags = [{"normal" : "B"}]
> config.members[2].tags = [{"normal" : "C"}]
> config.members[3].tags = [{"normal" : "D"}]
没有为隐藏成员
host4
设置标签。
接下来，为这些服务器中的大多数添加如下规则：
> config.settings.getLastErrorModes = [{"visibleMajority" : {"normal" : 3}}]
> rs.reconfig(config)
最后，可以在应用程序中使用这条规则：
db.products.insertOne(
{ "_id": 10, "item": "envelopes", "qty": 100, type: "Self-Sealing" },
{ writeConcern: { "w" : "visibleMajority", wtimeout ...
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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.