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Merge pull request 'layout: discard old info when it is completely out-of-date (fix #841)' (#861) from fix-841 into main

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Reviewed-on: Deuxfleurs/garage#861
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Alex 2024-08-24 11:12:39 +00:00
commit 8d62616ec0
1 changed files with 14 additions and 9 deletions
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23
src/rpc/layout/history.rs
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@ -227,24 +227,29 @@ impl LayoutHistory {
// ================== updates to layout, public interface ===================
pub fn merge(&mut self, other: &LayoutHistory) -> bool {
// If our current layout version is completely out-of-date,
// forget everything we know and replace it by incoming layout data.
if self.current().version < other.min_stored() {
*self = other.clone();
return true;
}
let mut changed = false;
// Add any new versions to history
for v2 in other.versions.iter() {
if let Some(v1) = self.versions.iter().find(|v| v.version == v2.version) {
if v2.version == self.current().version + 1 {
// This is the next version, add it to our version list
self.versions.push(v2.clone());
changed = true;
} else if let Some(v1) = self.versions.iter().find(|v| v.version == v2.version) {
// Version is already present, check consistency
if v1 != v2 {
error!("Inconsistent layout histories: different layout compositions for version {}. Your cluster will be broken as long as this layout version is not replaced.", v2.version);
}
} else if self.versions.iter().all(|v| v.version != v2.version - 1) {
error!(
"Cannot receive new layout version {}, version {} is missing",
v2.version,
v2.version - 1
);
} else {
self.versions.push(v2.clone());
changed = true;
// This is an older version
assert!(v2.version < self.min_stored());
}
}