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重复内容:
当输入是一个文件(一个字节序列),第一个处理步骤通常是将其解析为一系列记录。在流处理的上下文中,记录通常被叫做事件(event),但它本质上是一样的:一个小的,自包含的,不可变的对象,包含某个时间点发生的某件事情的细节。一个事件通常包含一个来自时钟的时间戳,以指明事件发生的时间(参见“单调钟与时钟”)。 例如,发生的事件可能是用户采取的行动,例如查看页面或进行购买。它也可能来源于机器,例如对温度传感器或CPU利用率的周期性测量。在“使用Unix工具进行批处理”的示例中,Web服务器日志的每一行都是一个事件。 事件可能被编码为文本字符串或JSON,或者某种二进制编码,如第4章所述。这种编码允许你存储一个事件,例如将其附加到一个文件,将其插入关系表,或将其写入文档数据库。它还允许你通过网络将事件发送到另一个节点以进行处理。
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tks, 已修复~
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重复内容:
The text was updated successfully, but these errors were encountered: