NLnet task 3 #667
4 changed files with 256 additions and 254 deletions
224
src/rpc/layout/helper.rs
Normal file
224
src/rpc/layout/helper.rs
Normal file
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@ -0,0 +1,224 @@
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use std::collections::HashMap;
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use std::ops::Deref;
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use std::sync::atomic::{AtomicUsize, Ordering};
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use garage_util::data::*;
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use super::schema::*;
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pub struct LayoutHelper {
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layout: Option<LayoutHistory>,
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// cached values
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ack_map_min: u64,
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sync_map_min: u64,
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all_nodes: Vec<Uuid>,
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all_nongateway_nodes: Vec<Uuid>,
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pub(crate) trackers_hash: Hash,
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pub(crate) staging_hash: Hash,
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// ack lock: counts in-progress write operations for each
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// layout version ; we don't increase the ack update tracker
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// while this lock is nonzero
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pub(crate) ack_lock: HashMap<u64, AtomicUsize>,
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}
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impl Deref for LayoutHelper {
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type Target = LayoutHistory;
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fn deref(&self) -> &LayoutHistory {
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self.layout()
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}
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}
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impl LayoutHelper {
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pub fn new(mut layout: LayoutHistory, mut ack_lock: HashMap<u64, AtomicUsize>) -> Self {
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layout.cleanup_old_versions();
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let all_nongateway_nodes = layout.get_all_nongateway_nodes();
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layout.clamp_update_trackers(&all_nongateway_nodes);
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let min_version = layout.min_stored();
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let ack_map_min = layout
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.update_trackers
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.ack_map
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.min(&all_nongateway_nodes, min_version);
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let sync_map_min = layout
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.update_trackers
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.sync_map
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.min(&all_nongateway_nodes, min_version);
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let all_nodes = layout.get_all_nodes();
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let trackers_hash = layout.calculate_trackers_hash();
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let staging_hash = layout.calculate_staging_hash();
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ack_lock.retain(|_, cnt| *cnt.get_mut() > 0);
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ack_lock
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.entry(layout.current().version)
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.or_insert(AtomicUsize::new(0));
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LayoutHelper {
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layout: Some(layout),
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ack_map_min,
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sync_map_min,
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all_nodes,
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all_nongateway_nodes,
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trackers_hash,
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staging_hash,
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ack_lock,
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}
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}
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// ------------------ single updating function --------------
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fn layout(&self) -> &LayoutHistory {
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self.layout.as_ref().unwrap()
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}
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pub(crate) fn update<F>(&mut self, f: F) -> bool
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where
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F: FnOnce(&mut LayoutHistory) -> bool,
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{
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let changed = f(&mut self.layout.as_mut().unwrap());
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if changed {
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*self = Self::new(
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self.layout.take().unwrap(),
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std::mem::take(&mut self.ack_lock),
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);
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}
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changed
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}
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// ------------------ read helpers ---------------
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pub fn all_nodes(&self) -> &[Uuid] {
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&self.all_nodes
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}
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pub fn all_nongateway_nodes(&self) -> &[Uuid] {
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&self.all_nongateway_nodes
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}
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pub fn all_ack(&self) -> u64 {
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self.ack_map_min
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}
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pub fn sync_versions(&self) -> (u64, u64, u64) {
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(
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self.layout().current().version,
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self.all_ack(),
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self.layout().min_stored(),
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)
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}
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pub fn read_nodes_of(&self, position: &Hash) -> Vec<Uuid> {
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let sync_min = self.sync_map_min;
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let version = self
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.layout()
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.versions
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.iter()
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.find(|x| x.version == sync_min)
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.or(self.layout().versions.last())
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.unwrap();
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version
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.nodes_of(position, version.replication_factor)
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.collect()
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}
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pub(crate) fn write_sets_of(&self, position: &Hash) -> Vec<Vec<Uuid>> {
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self.layout()
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.versions
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.iter()
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.map(|x| x.nodes_of(position, x.replication_factor).collect())
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.collect()
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}
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pub fn storage_nodes_of(&self, position: &Hash) -> Vec<Uuid> {
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let mut ret = vec![];
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for version in self.layout().versions.iter() {
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ret.extend(version.nodes_of(position, version.replication_factor));
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}
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ret.sort();
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ret.dedup();
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ret
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}
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pub fn trackers_hash(&self) -> Hash {
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self.trackers_hash
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}
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pub fn staging_hash(&self) -> Hash {
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self.staging_hash
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}
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// ------------------ helpers for update tracking ---------------
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pub(crate) fn update_trackers(&mut self, local_node_id: Uuid) {
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// Ensure trackers for this node's values are up-to-date
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// 1. Acknowledge the last layout version which is not currently
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// locked by an in-progress write operation
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self.ack_max_free(local_node_id);
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// 2. Assume the data on this node is sync'ed up at least to
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// the first layout version in the history
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self.sync_first(local_node_id);
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// 3. Acknowledge everyone has synced up to min(self.sync_map)
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self.sync_ack(local_node_id);
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info!("ack_map: {:?}", self.update_trackers.ack_map);
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info!("sync_map: {:?}", self.update_trackers.sync_map);
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info!("sync_ack_map: {:?}", self.update_trackers.sync_ack_map);
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}
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fn sync_first(&mut self, local_node_id: Uuid) {
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let first_version = self.versions.first().as_ref().unwrap().version;
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self.update(|layout| {
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layout
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.update_trackers
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.sync_map
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.set_max(local_node_id, first_version)
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});
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}
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fn sync_ack(&mut self, local_node_id: Uuid) {
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let sync_map_min = self.sync_map_min;
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self.update(|layout| {
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layout
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.update_trackers
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.sync_ack_map
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.set_max(local_node_id, sync_map_min)
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});
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}
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pub(crate) fn ack_max_free(&mut self, local_node_id: Uuid) -> bool {
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let max_ack = self.max_free_ack();
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let changed = self.update(|layout| {
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layout
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.update_trackers
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.ack_map
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.set_max(local_node_id, max_ack)
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});
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if changed {
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info!("ack_until updated to {}", max_ack);
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}
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changed
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}
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pub(crate) fn max_free_ack(&self) -> u64 {
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self.layout()
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.versions
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.iter()
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.map(|x| x.version)
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.take_while(|v| {
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self.ack_lock
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.get(v)
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.map(|x| x.load(Ordering::Relaxed) == 0)
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.unwrap_or(true)
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})
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.max()
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.unwrap_or(self.min_stored())
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}
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}
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@ -1,7 +1,4 @@
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use std::collections::HashMap;
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use std::collections::HashSet;
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use std::ops::Deref;
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use std::sync::atomic::{AtomicUsize, Ordering};
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use garage_util::crdt::{Crdt, Lww, LwwMap};
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use garage_util::data::*;
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@ -11,225 +8,6 @@ use garage_util::error::*;
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use super::schema::*;
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use super::*;
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pub struct LayoutHelper {
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layout: Option<LayoutHistory>,
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// cached values
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ack_map_min: u64,
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sync_map_min: u64,
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all_nodes: Vec<Uuid>,
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all_nongateway_nodes: Vec<Uuid>,
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trackers_hash: Hash,
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staging_hash: Hash,
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// ack lock: counts in-progress write operations for each
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// layout version ; we don't increase the ack update tracker
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// while this lock is nonzero
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pub(crate) ack_lock: HashMap<u64, AtomicUsize>,
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}
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impl Deref for LayoutHelper {
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type Target = LayoutHistory;
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fn deref(&self) -> &LayoutHistory {
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self.layout()
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}
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}
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impl LayoutHelper {
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pub fn new(mut layout: LayoutHistory, mut ack_lock: HashMap<u64, AtomicUsize>) -> Self {
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layout.cleanup_old_versions();
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let all_nongateway_nodes = layout.get_all_nongateway_nodes();
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layout.clamp_update_trackers(&all_nongateway_nodes);
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let min_version = layout.min_stored();
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let ack_map_min = layout
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.update_trackers
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.ack_map
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.min(&all_nongateway_nodes, min_version);
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let sync_map_min = layout
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.update_trackers
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.sync_map
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.min(&all_nongateway_nodes, min_version);
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let all_nodes = layout.get_all_nodes();
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let trackers_hash = layout.calculate_trackers_hash();
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let staging_hash = layout.calculate_staging_hash();
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ack_lock.retain(|_, cnt| *cnt.get_mut() > 0);
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ack_lock
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.entry(layout.current().version)
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.or_insert(AtomicUsize::new(0));
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LayoutHelper {
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layout: Some(layout),
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ack_map_min,
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sync_map_min,
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all_nodes,
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all_nongateway_nodes,
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trackers_hash,
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staging_hash,
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ack_lock,
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}
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}
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// ------------------ single updating function --------------
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fn layout(&self) -> &LayoutHistory {
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self.layout.as_ref().unwrap()
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}
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pub(crate) fn update<F>(&mut self, f: F) -> bool
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where
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F: FnOnce(&mut LayoutHistory) -> bool,
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{
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let changed = f(&mut self.layout.as_mut().unwrap());
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if changed {
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*self = Self::new(
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self.layout.take().unwrap(),
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std::mem::take(&mut self.ack_lock),
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);
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}
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changed
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}
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// ------------------ read helpers ---------------
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pub fn all_nodes(&self) -> &[Uuid] {
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&self.all_nodes
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}
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pub fn all_nongateway_nodes(&self) -> &[Uuid] {
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&self.all_nongateway_nodes
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}
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pub fn all_ack(&self) -> u64 {
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self.ack_map_min
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}
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pub fn sync_versions(&self) -> (u64, u64, u64) {
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(
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self.layout().current().version,
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self.all_ack(),
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self.layout().min_stored(),
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)
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}
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pub fn read_nodes_of(&self, position: &Hash) -> Vec<Uuid> {
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let sync_min = self.sync_map_min;
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let version = self
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.layout()
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.versions
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.iter()
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.find(|x| x.version == sync_min)
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.or(self.layout().versions.last())
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.unwrap();
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version
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.nodes_of(position, version.replication_factor)
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.collect()
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}
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pub(crate) fn write_sets_of(&self, position: &Hash) -> Vec<Vec<Uuid>> {
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self.layout()
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.versions
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.iter()
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.map(|x| x.nodes_of(position, x.replication_factor).collect())
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.collect()
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}
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pub fn storage_nodes_of(&self, position: &Hash) -> Vec<Uuid> {
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let mut ret = vec![];
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for version in self.layout().versions.iter() {
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ret.extend(version.nodes_of(position, version.replication_factor));
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}
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ret.sort();
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ret.dedup();
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ret
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}
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pub fn trackers_hash(&self) -> Hash {
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self.trackers_hash
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}
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pub fn staging_hash(&self) -> Hash {
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self.staging_hash
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}
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// ------------------ helpers for update tracking ---------------
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pub(crate) fn update_trackers(&mut self, local_node_id: Uuid) {
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// Ensure trackers for this node's values are up-to-date
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// 1. Acknowledge the last layout version which is not currently
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// locked by an in-progress write operation
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self.ack_max_free(local_node_id);
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// 2. Assume the data on this node is sync'ed up at least to
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// the first layout version in the history
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self.sync_first(local_node_id);
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// 3. Acknowledge everyone has synced up to min(self.sync_map)
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self.sync_ack(local_node_id);
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info!("ack_map: {:?}", self.update_trackers.ack_map);
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info!("sync_map: {:?}", self.update_trackers.sync_map);
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info!("sync_ack_map: {:?}", self.update_trackers.sync_ack_map);
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}
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fn sync_first(&mut self, local_node_id: Uuid) {
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let first_version = self.versions.first().as_ref().unwrap().version;
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self.update(|layout| {
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layout
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.update_trackers
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.sync_map
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.set_max(local_node_id, first_version)
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});
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}
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fn sync_ack(&mut self, local_node_id: Uuid) {
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let sync_map_min = self.sync_map_min;
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self.update(|layout| {
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layout
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.update_trackers
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.sync_ack_map
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.set_max(local_node_id, sync_map_min)
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});
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}
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pub(crate) fn ack_max_free(&mut self, local_node_id: Uuid) -> bool {
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let max_ack = self.max_free_ack();
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let changed = self.update(|layout| {
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layout
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.update_trackers
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.ack_map
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.set_max(local_node_id, max_ack)
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});
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if changed {
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info!("ack_until updated to {}", max_ack);
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}
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changed
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}
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pub(crate) fn max_free_ack(&self) -> u64 {
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self.layout()
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.versions
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.iter()
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.map(|x| x.version)
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.take_while(|v| {
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self.ack_lock
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.get(v)
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.map(|x| x.load(Ordering::Relaxed) == 0)
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.unwrap_or(true)
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})
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.max()
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.unwrap_or(self.min_stored())
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}
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}
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// ----
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impl LayoutHistory {
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pub fn new(replication_factor: usize) -> Self {
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let version = LayoutVersion::new(replication_factor);
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|
|
@ -270,7 +48,7 @@ impl LayoutHistory {
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}
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}
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fn get_all_nongateway_nodes(&self) -> Vec<Uuid> {
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pub(crate) fn get_all_nongateway_nodes(&self) -> Vec<Uuid> {
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if self.versions.len() == 1 {
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self.versions[0].nongateway_nodes().to_vec()
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} else {
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|
|
@ -286,8 +64,21 @@ impl LayoutHistory {
|
|||
|
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// ---- housekeeping (all invoked by LayoutHelper) ----
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fn cleanup_old_versions(&mut self) {
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loop {
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pub(crate) fn cleanup_old_versions(&mut self) {
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// If there are invalid versions before valid versions, remove them
|
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if self.versions.len() > 1 && self.current().check().is_ok() {
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while self.versions.len() > 1 && self.versions.first().unwrap().check().is_err() {
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let removed = self.versions.remove(0);
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info!(
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"Layout history: pruning old invalid version {}",
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removed.version
|
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);
|
||||
}
|
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}
|
||||
|
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// If there are old versions that no one is reading from anymore,
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// remove them
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while self.versions.len() > 1 {
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let all_nongateway_nodes = self.get_all_nongateway_nodes();
|
||||
let min_version = self.min_stored();
|
||||
let sync_ack_map_min = self
|
||||
|
|
@ -303,7 +94,7 @@ impl LayoutHistory {
|
|||
}
|
||||
}
|
||||
|
||||
fn clamp_update_trackers(&mut self, nodes: &[Uuid]) {
|
||||
pub(crate) fn clamp_update_trackers(&mut self, nodes: &[Uuid]) {
|
||||
let min_v = self.min_stored();
|
||||
for node in nodes {
|
||||
self.update_trackers.ack_map.set_max(*node, min_v);
|
||||
|
|
@ -312,11 +103,11 @@ impl LayoutHistory {
|
|||
}
|
||||
}
|
||||
|
||||
fn calculate_trackers_hash(&self) -> Hash {
|
||||
pub(crate) fn calculate_trackers_hash(&self) -> Hash {
|
||||
blake2sum(&nonversioned_encode(&self.update_trackers).unwrap()[..])
|
||||
}
|
||||
|
||||
fn calculate_staging_hash(&self) -> Hash {
|
||||
pub(crate) fn calculate_staging_hash(&self) -> Hash {
|
||||
blake2sum(&nonversioned_encode(&self.staging).unwrap()[..])
|
||||
}
|
||||
|
||||
|
|
@ -328,6 +119,7 @@ impl LayoutHistory {
|
|||
// 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) {
|
||||
// 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);
|
||||
}
|
||||
|
|
@ -344,24 +136,14 @@ impl LayoutHistory {
|
|||
}
|
||||
|
||||
// Merge trackers
|
||||
if self.update_trackers != other.update_trackers {
|
||||
let c = self.update_trackers.merge(&other.update_trackers);
|
||||
changed = changed || c;
|
||||
}
|
||||
|
||||
// If there are invalid versions before valid versions, remove them,
|
||||
// and increment update trackers
|
||||
if self.versions.len() > 1 && self.current().check().is_ok() {
|
||||
while self.versions.first().unwrap().check().is_err() {
|
||||
self.versions.remove(0);
|
||||
changed = true;
|
||||
}
|
||||
}
|
||||
|
||||
// Merge staged layout changes
|
||||
if self.staging != other.staging {
|
||||
let prev_staging = self.staging.clone();
|
||||
self.staging.merge(&other.staging);
|
||||
changed = true;
|
||||
changed = changed || self.staging != prev_staging;
|
||||
}
|
||||
|
||||
changed
|
||||
|
|
@ -390,11 +172,7 @@ To know the correct value of the new layout version, invoke `garage layout show`
|
|||
.calculate_next_version(&self.staging.get())?;
|
||||
|
||||
self.versions.push(new_version);
|
||||
if self.current().check().is_ok() {
|
||||
while self.versions.first().unwrap().check().is_err() {
|
||||
self.versions.remove(0);
|
||||
}
|
||||
}
|
||||
self.cleanup_old_versions();
|
||||
|
||||
// Reset the staged layout changes
|
||||
self.staging.update(LayoutStaging {
|
||||
|
|
@ -415,11 +193,7 @@ To know the correct value of the new layout version, invoke `garage layout show`
|
|||
}
|
||||
|
||||
pub fn check(&self) -> Result<(), String> {
|
||||
for version in self.versions.iter() {
|
||||
version.check()?;
|
||||
}
|
||||
|
||||
// TODO: anything more ?
|
||||
Ok(())
|
||||
self.current().check()
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -184,17 +184,20 @@ impl LayoutManager {
|
|||
return Some(layout.clone());
|
||||
}
|
||||
}
|
||||
|
||||
None
|
||||
}
|
||||
|
||||
fn merge_layout_trackers(&self, adv: &UpdateTrackers) -> Option<UpdateTrackers> {
|
||||
let mut layout = self.layout.write().unwrap();
|
||||
|
||||
if layout.update_trackers != *adv {
|
||||
if layout.update(|l| l.update_trackers.merge(adv)) {
|
||||
layout.update_trackers(self.node_id);
|
||||
return Some(layout.update_trackers.clone());
|
||||
}
|
||||
}
|
||||
|
||||
None
|
||||
}
|
||||
|
||||
|
|
@ -284,7 +287,7 @@ impl LayoutManager {
|
|||
}
|
||||
|
||||
pub(crate) fn handle_pull_cluster_layout(&self) -> SystemRpc {
|
||||
let layout = self.layout.read().unwrap().clone(); // TODO: avoid cloning
|
||||
let layout = self.layout.read().unwrap().clone();
|
||||
SystemRpc::AdvertiseClusterLayout(layout)
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,5 @@
|
|||
mod graph_algo;
|
||||
mod helper;
|
||||
mod history;
|
||||
mod schema;
|
||||
mod version;
|
||||
|
|
@ -10,7 +11,7 @@ pub mod manager;
|
|||
|
||||
// ---- re-exports ----
|
||||
|
||||
pub use history::*;
|
||||
pub use helper::LayoutHelper;
|
||||
pub use manager::WriteLock;
|
||||
pub use schema::*;
|
||||
pub use version::*;
|
||||
|
|
|
|||
Loading…
Reference in a new issue