October 2021
Beginner to intermediate
250 pages
7h 11m
Chinese
Content preview from 微服务与事件驱动架构
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有状态的流
｜
93
内存方法可带来非常高的吞吐量并显著降低数据访问瓶颈。
3.
使用网络连接磁盘的灵活性
微服务也可以使用网络连接的磁盘代替本地磁盘，这会显著增加读
/
写延迟
。由于通常必
须一次处理一个事件以保持时间顺序和偏移顺序，因此单个处理线程将花费大量时间等待
读
/
写响应
，这导致每个处理程序的吞吐量明显较低。对不需要高性能处理的有状态服务
来说，这通常是可以的，但是如果事件量很大，则可能会出现问题。
访问存储在网络连接的磁盘上的“本地”数据要比访问存储在系统内存或物理连接的磁盘
上的本地数据有更高的延迟。虽然配置本地
SSD
的
RocksDB
预估有
154 000
个请求
/
秒的
吞吐量，但是如果引入往返时间只有
1
毫秒
的网络延迟，对于相同的访问模式，也会将吞
吐量上限降至只有
939
个请求
/
秒
。虽然可以使用并行访问来减小这个差距，但要记住事
件的消费和处理必须按偏移量的顺序进行，因此在许多情况下并不能执行并行操作。
网络连接磁盘的一个主要优点是可以在数据卷中维护状态，并根据需要迁移到新的处理硬
件。当处理节点恢复时，可以重新连接网络磁盘，并且在停止的位置继续处理，而不是从
变更日志流重建。这大大减少了中断时间，因为状态不再像本地磁盘那样完全是短暂的，
而且当你使用廉价的按需节点时，还增加了微服务跨计算资源迁移的灵活性。
7.3.3
使用内部状态的缺点
1.
仅限于使用运行时定义的磁盘
内部状态存储仅限于使用在服务运行时定义并连接到节点的磁盘。变更所连接数据卷的大
小和数量通常要暂停服务、调整卷，然后重启服务。此外，许多计算资源管理方案只允许 ...
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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.