Preallocate fstree directories #1512

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opened 2025-12-28 17:35:41 +00:00 by sami · 0 comments

sami commented

2025-12-28 17:35:41 +00:00

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Originally created by @roman-khimov on GitHub (Sep 23, 2025).

I'm always frustrated when we stat/mkdir during object put.

Describe the solution you'd like

I think we can preallocate to depth 2 right at fstree init (just a bit more than 3K directories). Theoretically depth 3 can be done in background, but maybe it's not worth it, needs to be tested. If we're to perform any background directory creation fstree config can be leveraged to mark tree as completely ready (allowing to avoid directory stat), see https://github.com/nspcc-dev/neofs-node/issues/2174#issuecomment-2939337843.

Describe alternatives you've considered

Things work as is.

Originally created by @roman-khimov on GitHub (Sep 23, 2025). ## Is your feature request related to a problem? Please describe. I'm always frustrated when we stat/mkdir during object put. ## Describe the solution you'd like I think we can preallocate to depth 2 right at fstree init (just a bit more than 3K directories). Theoretically depth 3 can be done in background, but maybe it's not worth it, needs to be tested. If we're to perform any background directory creation fstree config can be leveraged to mark tree as completely ready (allowing to avoid directory stat), see https://github.com/nspcc-dev/neofs-node/issues/2174#issuecomment-2939337843. ## Describe alternatives you've considered Things work as is.