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感谢关注pika。我们会持续关注rocksdb是否能支持nvme2.0的规范 |
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如果rocksdb支持，那对开发者可以几乎不做额外工作。 我的意思是像nvme 的驱动更可能成为操作系统内核的一部分，而成为大家习惯直接使用的东西。rocksdb没有必要拷贝改写一份，增加接口版本的碎片化 我觉得有必要存在的东西倒是从rocksdb数据库导出/导入到key/value 硬盘的小工具 |
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说更清楚，我感觉这是一场不对等的屠杀。整个产业联盟要顺带干掉一个小数据库软件。除了rocksdb的好被看上，其它甚至不关rocksdb什么事 这一切5年之内应该可以完成。主要一方面是redis over flash 现在还没有成为主流，所以也并不存在主流的迁移。其次是因为flash的价格依然在快速下跌的过程中。 redis over flash接下来几年的爆发也应该是和key-valud ssd 推广同步的过程 |
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我意识到对redis compatible db而言，导出工具也是不必要存在的。有现成的redis migrate之类的可用工具。这是最完美的兼容性约定，没有引入任何额外约定 |
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背景：现在支持nvme 2.0 的samsung 990 pro 硬盘已经开始销售。群联的nvme 2.0 主控做出的产品也已经开始广泛地出货。
键值存储性能非凡，他实现了比尔·盖茨1990s在微软试图开发最终极文件系统的愿望。
It cut down disk io to 1/6, compared with other db according to samsung's early study.
It reduce flash write amplification to 1.0, while redis rdb has a write amplification ratio over 1000.
It's fast, typically, it can provide more than 2M+ iops with lowest latency. Some studies shows one nvme key-value disk can relace 50 xeon kernels that running rocksdb, using about 1/100 power and zero system memory.
nvme 2.0 kv disk can get LINEARY PERFORMANCE GROWTH while number of disk increase. Other db usually get a log-like performance growth using same single db interface.
it never lost data,once data send to disk.
It won't create a db file like rocksdb which always expanding its size, and awkward to shrink size.
It's cheap and easy available when time comes to 2023.
鉴于nvme 2.0 接下来也只是最寻常的硬盘接口规范。建议pika 的重点应转向支持新的硬盘规范。
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