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I didn't know much about what Yugabyte was:

https://docs.yugabyte.com/latest/comparisons/

I wonder what architectural reasons there are that allow them to claim low p-99 latency. Is it because of allowing different consistency levels?

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This is due to a combination of factors-- the choice of implementation language (C++), a variety of enhancements to RocksDB, consistent reads from leaders (using leader leases) rather than doing a 3-way quorum read, etc. We discuss these aspects in more detail here:

[1] https://blog.yugabyte.com/how-we-built-a-high-performance-do...

[2] https://blog.yugabyte.com/enhancing-rocksdb-for-speed-scale/

[3] https://blog.yugabyte.com/low-latency-reads-in-geo-distribut...

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