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go包 包名最好是小写；导入多个包时，最好按照字母顺序排列方便易读。
如果包名不是以 . 或 / 开头，如 “fmt” 或者 “container/list”，则 Go 会在全局文件进行查找；如果包名以 ./ 开头，则 Go 会在相对目录中查找；如果包名以 / 开头（在 Windows 下也可以这
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zookeeper(257)
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Zookeeper提供了文件系统和通知机制
文件系统目录就是znode，能自由删除、增加znode，并可以存储数据。PERSISTENT-持久化目录节点：客户端与zookeeper断开连接后，该节点依旧存在PERSISTENT_SEQUENTIAL-持久化顺序编号目录节点：客户端与zookeeper
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mysql(255)
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索引类型：
普通索引：最基本的索引，没有任何限制
唯一索引：与"普通索引"类似，不同的就是：索引列的值必须唯一，但允许有空值。
主键索引：它 是一种特殊的唯一索引，不允许有空值。
全文索引：仅可用于 MyISAM 表，针对较大的数据，生成全文索引很耗时好空间。
组合索引
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kafka/依赖注入(256)
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kafka
对于一个group而言，消费者的数量不应该多余分区的数量，因为在一个group中，每个分区至多只能绑定到一个消费者上，即一个消费者可以消费多个分区，一个分区只能给一个消费者消费
因此，若一个group中的消费者数量大于分区数量的话，多余的消费者将不会收到任何消息
依赖注入
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jenkins配置(254)
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c#语法糖253
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原文章地址
abstract类最好用来声明公共const变量
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