forked from Deuxfleurs/garage
new layout: use deterministic randomness for reproducible results
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1 changed files with 6 additions and 2 deletions
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@ -1,7 +1,7 @@
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//! This module deals with graph algorithms.
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//! It is used in layout.rs to build the partition to node assignment.
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use rand::prelude::SliceRandom;
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use rand::prelude::{SeedableRng, SliceRandom};
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use std::cmp::{max, min};
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use std::collections::HashMap;
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use std::collections::VecDeque;
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@ -143,7 +143,11 @@ impl Graph<FlowEdge> {
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/// This function shuffles the order of the edge lists. It keeps the ids of the
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/// reversed edges consistent.
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fn shuffle_edges(&mut self) {
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let mut rng = rand::thread_rng();
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// We use deterministic randomness so that the layout calculation algorihtm
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// will output the same thing every time it is run. This way, the results
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// pre-calculated in `garage layout show` will match exactly those used
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// in practice with `garage layout apply`
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let mut rng = rand::rngs::StdRng::from_seed([0x12u8; 32]);
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for i in 0..self.graph.len() {
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self.graph[i].shuffle(&mut rng);
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// We need to update the ids of the reverse edges.
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