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[TEST] Add assert.Unreachable when using legacy JSON stream snapshot #7486

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Merged
neilalexander merged 1 commit into from
Oct 29, 2025
Merged

[TEST] Add assert.Unreachable when using legacy JSON stream snapshot #7486

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7 changes: 7 additions & 0 deletions server/jetstream_cluster.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8765,6 +8765,13 @@ func (mset *stream) stateSnapshotLocked() []byte {
}

// Older v1 version with deleted as a sorted []uint64.
// For a stream with millions or billions of interior deletes, this will be huge.
// Now that all server versions 2.10.+ support binary snapshots, we should never fall back.
assert.Unreachable("Legacy JSON stream snapshot used", map[string]any{
"stream": mset.cfg.Name,
"account": mset.acc.Name,
})

state := mset.store.State()
snap := &streamSnapshot{
Msgs: state.Msgs,
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