Bitcoin full node and query server
Nov 5, 2024
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josie18:43
somewhat unrelated, im very curious what insights you guys have regarding mmap'd db architectures. ive been exploring mdbx as a replacement for leveldb in core as sort of a moonshot side experiment, and mdbx (fork of lmdb) is essentially a mmap'd shadow paged btree. we saw some really promising benchmarks, but also a ton of write amplification. curious if you guys have any insights, since it seems you've rolled your own mmaped db architecture?
evoskuil19:32
We have almost a decade of experience with this. Another major issue is fault tolerance and reliability. If you don't have an append only store, you can forget about fault tolerance, and reliability will be limited to detecting that the store is corrupt due to an incomplete flush on shutdown, but you will not be able to fix it (resync).