Files
s3/weed/mount/peer_hrw.go
zooqueen dd74d3e6d6 Replace AGPL MinIO fork with Apache-2.0 SeaweedFS fork; rebrand CLI weed->s3
hanzoai/s3 was an AGPL-3.0 MinIO fork whose network-copyleft blocks embedding
and reselling as a managed service. Replace it wholesale with a fork of
SeaweedFS (github.com/seaweedfs/seaweedfs, Apache-2.0, Go) which ships a
built-in S3 gateway + Filer.

- License: AGPL-3.0 -> Apache-2.0 (upstream LICENSE kept verbatim, incl.
  "Copyright 2025 Chris Lu"); NOTICE added crediting SeaweedFS. No AGPL/BUSL/
  SSPL/GPL or enterprise ("ee") files remain.
- Module: go.mod path set to github.com/hanzoai/s3 with a self-replace
  (replace github.com/seaweedfs/seaweedfs => ./) so the ~1800 internal Go files
  keep their upstream import paths with zero churn. Internal identifiers and
  import paths are intentionally NOT renamed.
- CLI rebrand: the binary is built as `s3` (was `weed`); root usage, per-command
  help/usage/flag strings, shell autocomplete program name, and the product name
  in CLI output now read "Hanzo S3" / `s3`. Users never see `weed`.
  (e.g. `s3 server`, `s3 filer`, `s3 master`, `s3 volume`, `s3 s3`, `s3 mount`.)
- Build: `make` (or `go build -o s3 ./weed`) builds the `s3` binary green;
  `cmd/weed-db` and `cmd/weed-sql` also build; `go vet ./weed/command/` clean.
- README/LLM.md rewritten for Hanzo S3; AGENTS.md/CLAUDE.md symlinks preserved.
- Dropped a 33MB prebuilt Mach-O `stress` binary upstream had committed; `.gitignore`
  updated to ignore the `s3` build output.
2026-06-18 23:41:25 -07:00

52 lines
1.5 KiB
Go

package mount
import (
"hash/fnv"
)
// SeedPeer is a mount server present in the filer's mount registry.
// DataCenter and Rack ride along so downstream locality-aware decisions
// (peer re-ranking in the fetcher) don't have to re-query the filer.
type SeedPeer struct {
PeerAddr string
DataCenter string
Rack string
}
// OwnerFor returns the peer_addr of the mount that is the HRW-assigned
// directory owner for fid on the given seed list.
//
// Rendezvous (highest-random-weight) hashing is deterministic for a given
// (fid, seed set): every mount computes the same owner without any
// consensus. When a mount joins or leaves the seed set, only 1/N of fids
// change owner — the rest remain on their existing mount.
//
// If seeds is empty, returns "".
//
// See design-weed-mount-peer-chunk-sharing.md §4.2.2.
func OwnerFor(fid string, seeds []SeedPeer) string {
if len(seeds) == 0 {
return ""
}
var bestScore uint64
var bestAddr string
for _, s := range seeds {
score := hrwScore(s.PeerAddr, fid)
if bestAddr == "" || score > bestScore || (score == bestScore && s.PeerAddr < bestAddr) {
bestScore = score
bestAddr = s.PeerAddr
}
}
return bestAddr
}
// hrwScore combines peer_addr and fid into a 64-bit score. Uses FNV-1a
// (cheap and fine for balancing; not a security primitive).
func hrwScore(peerAddr, fid string) uint64 {
h := fnv.New64a()
_, _ = h.Write([]byte(peerAddr))
_, _ = h.Write([]byte{0}) // separator so "ab" + "c" != "a" + "bc"
_, _ = h.Write([]byte(fid))
return h.Sum64()
}