WIP: Make replication mode part of cluster layout #819
11 changed files with 65 additions and 181 deletions
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@ -40,9 +40,6 @@ pub struct Garage {
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/// The set of background variables that can be viewed/modified at runtime
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pub bg_vars: vars::BgVars,
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/// The replication factor of this cluster
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pub replication_factor: ReplicationFactor,
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/// The local database
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pub db: db::Db,
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/// The membership manager
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@ -143,26 +140,23 @@ impl Garage {
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.and_then(|x| NetworkKey::from_slice(&x))
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.ok_or_message("Invalid RPC secret key")?;
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let (replication_factor, consistency_mode) = parse_replication_mode(&config)?;
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let consistency_mode = ConsistencyMode::parse(&config.consistency_mode)
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.ok_or_message("Invalid consistency_mode in config file.")?;
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info!("Initialize background variable system...");
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let mut bg_vars = vars::BgVars::new();
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info!("Initialize membership management system...");
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let system = System::new(network_key, replication_factor, consistency_mode, &config)?;
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let system = System::new(network_key, consistency_mode, &config)?;
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let data_rep_param = TableShardedReplication {
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system: system.clone(),
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replication_factor: replication_factor.into(),
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write_quorum: replication_factor.write_quorum(consistency_mode),
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read_quorum: 1,
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layout_manager: system.layout_manager.clone(),
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consistency_mode,
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};
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let meta_rep_param = TableShardedReplication {
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system: system.clone(),
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replication_factor: replication_factor.into(),
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write_quorum: replication_factor.write_quorum(consistency_mode),
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read_quorum: replication_factor.read_quorum(consistency_mode),
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layout_manager: system.layout_manager.clone(),
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consistency_mode,
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};
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let control_rep_param = TableFullReplication {
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@ -259,7 +253,6 @@ impl Garage {
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Ok(Arc::new(Self {
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config,
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bg_vars,
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replication_factor,
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db,
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system,
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block_manager,
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@ -28,7 +28,6 @@ pub struct SyncLayoutDigest {
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}
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pub struct LayoutHelper {
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replication_factor: ReplicationFactor,
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consistency_mode: ConsistencyMode,
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layout: Option<LayoutHistory>,
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@ -51,7 +50,6 @@ pub struct LayoutHelper {
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impl LayoutHelper {
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pub fn new(
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replication_factor: ReplicationFactor,
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consistency_mode: ConsistencyMode,
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mut layout: LayoutHistory,
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mut ack_lock: HashMap<u64, AtomicUsize>,
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@ -97,8 +95,7 @@ impl LayoutHelper {
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// consistency on those).
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// This value is calculated using quorums to allow progress even
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// if not all nodes have successfully completed a sync.
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let sync_map_min =
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layout.calculate_sync_map_min_with_quorum(replication_factor, &all_nongateway_nodes);
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let sync_map_min = layout.calculate_sync_map_min_with_quorum(&all_nongateway_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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@ -111,7 +108,6 @@ impl LayoutHelper {
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let is_check_ok = layout.check().is_ok();
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LayoutHelper {
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replication_factor,
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consistency_mode,
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layout: Some(layout),
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ack_map_min,
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@ -134,7 +130,6 @@ impl LayoutHelper {
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let changed = f(self.layout.as_mut().unwrap());
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if changed {
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*self = Self::new(
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self.replication_factor,
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self.consistency_mode,
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self.layout.take().unwrap(),
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std::mem::take(&mut self.ack_lock),
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@ -9,8 +9,8 @@ use super::*;
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use crate::replication_mode::*;
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impl LayoutHistory {
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pub fn new(replication_factor: ReplicationFactor) -> Self {
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let version = LayoutVersion::new(replication_factor.into());
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pub fn new() -> Self {
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let version = LayoutVersion::new(3);
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let staging = LayoutStaging {
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parameters: Lww::<LayoutParameters>::new(version.parameters),
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@ -123,11 +123,7 @@ impl LayoutHistory {
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}
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}
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pub(crate) fn calculate_sync_map_min_with_quorum(
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&self,
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replication_factor: ReplicationFactor,
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all_nongateway_nodes: &[Uuid],
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) -> u64 {
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pub(crate) fn calculate_sync_map_min_with_quorum(&self, all_nongateway_nodes: &[Uuid]) -> u64 {
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// This function calculates the minimum layout version from which
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// it is safe to read if we want to maintain read-after-write consistency.
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// In the general case the computation can be a bit expensive so
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@ -139,7 +135,7 @@ impl LayoutHistory {
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return self.current().version;
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}
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let quorum = replication_factor.write_quorum(ConsistencyMode::Consistent);
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let quorum = self.current().write_quorum(ConsistencyMode::Consistent);
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let min_version = self.min_stored();
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let global_min = self
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@ -153,7 +149,11 @@ impl LayoutHistory {
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// This is represented by reading from the layout with version
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// number global_min, the smallest layout version for which all nodes
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// have completed a sync.
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if quorum == self.current().replication_factor {
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if self
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.versions
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.iter()
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.all(|v| v.write_quorum(ConsistencyMode::Consistent) == v.replication_factor)
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{
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return global_min;
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}
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@ -20,7 +20,6 @@ use crate::system::*;
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pub struct LayoutManager {
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node_id: Uuid,
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replication_factor: ReplicationFactor,
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persist_cluster_layout: Persister<LayoutHistory>,
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layout: Arc<RwLock<LayoutHelper>>,
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@ -38,38 +37,24 @@ impl LayoutManager {
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node_id: NodeID,
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system_endpoint: Arc<Endpoint<SystemRpc, System>>,
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peering: Arc<PeeringManager>,
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replication_factor: ReplicationFactor,
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consistency_mode: ConsistencyMode,
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) -> Result<Arc<Self>, Error> {
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let persist_cluster_layout: Persister<LayoutHistory> =
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Persister::new(&config.metadata_dir, "cluster_layout");
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let cluster_layout = match persist_cluster_layout.load() {
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Ok(x) => {
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if x.current().replication_factor != replication_factor.replication_factor() {
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return Err(Error::Message(format!(
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"Prevous cluster layout has replication factor {}, which is different than the one specified in the config file ({}). The previous cluster layout can be purged, if you know what you are doing, simply by deleting the `cluster_layout` file in your metadata directory.",
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x.current().replication_factor,
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replication_factor.replication_factor()
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)));
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}
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x
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}
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Ok(x) => x,
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Err(e) => {
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info!(
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"No valid previous cluster layout stored ({}), starting fresh.",
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e
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);
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LayoutHistory::new(replication_factor)
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LayoutHistory::new()
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}
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};
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let mut cluster_layout = LayoutHelper::new(
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replication_factor,
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consistency_mode,
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cluster_layout,
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Default::default(),
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);
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let mut cluster_layout =
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LayoutHelper::new(consistency_mode, cluster_layout, Default::default());
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cluster_layout.update_update_trackers(node_id.into());
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let layout = Arc::new(RwLock::new(cluster_layout));
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@ -84,7 +69,6 @@ impl LayoutManager {
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Ok(Arc::new(Self {
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node_id: node_id.into(),
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replication_factor,
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persist_cluster_layout,
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layout,
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change_notify,
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@ -298,16 +282,6 @@ impl LayoutManager {
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adv.update_trackers
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);
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if adv.current().replication_factor != self.replication_factor.replication_factor() {
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let msg = format!(
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"Received a cluster layout from another node with replication factor {}, which is different from what we have in our configuration ({}). Discarding the cluster layout we received.",
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adv.current().replication_factor,
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self.replication_factor.replication_factor()
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);
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error!("{}", msg);
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return Err(Error::Message(msg));
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}
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if let Some(new_layout) = self.merge_layout(adv) {
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debug!("handle_advertise_cluster_layout: some changes were added to the current stuff");
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@ -5,7 +5,6 @@ use garage_util::crdt::Crdt;
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use garage_util::error::*;
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use crate::layout::*;
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use crate::replication_mode::ReplicationFactor;
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// This function checks that the partition size S computed is at least better than the
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// one given by a very naive algorithm. To do so, we try to run the naive algorithm
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@ -121,7 +120,7 @@ fn test_assignment() {
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let mut node_capacity_vec = vec![4000, 1000, 2000];
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let mut node_zone_vec = vec!["A", "B", "C"];
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let mut cl = LayoutHistory::new(ReplicationFactor::new(3).unwrap());
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let mut cl = LayoutHistory::new();
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update_layout(&mut cl, &node_capacity_vec, &node_zone_vec, 3);
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let v = cl.current().version;
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let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
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@ -11,6 +11,7 @@ use garage_util::error::*;
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use super::graph_algo::*;
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use super::*;
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use crate::replication_mode::ConsistencyMode;
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// The Message type will be used to collect information on the algorithm.
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pub type Message = Vec<String>;
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@ -843,4 +844,20 @@ impl LayoutVersion {
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Ok(msg)
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}
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pub fn read_quorum(&self, consistency_mode: ConsistencyMode) -> usize {
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match consistency_mode {
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ConsistencyMode::Dangerous | ConsistencyMode::Degraded => 1,
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ConsistencyMode::Consistent => self.replication_factor.div_ceil(2),
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}
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}
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pub fn write_quorum(&self, consistency_mode: ConsistencyMode) -> usize {
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match consistency_mode {
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ConsistencyMode::Dangerous => 1,
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ConsistencyMode::Degraded | ConsistencyMode::Consistent => {
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(self.replication_factor + 1) - self.read_quorum(ConsistencyMode::Consistent)
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}
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}
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}
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}
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@ -1,12 +1,6 @@
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use garage_util::config::Config;
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use garage_util::crdt::AutoCrdt;
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use garage_util::error::*;
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use serde::{Deserialize, Serialize};
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#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
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#[serde(transparent)]
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pub struct ReplicationFactor(usize);
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#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Default, Serialize, Deserialize)]
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#[serde(rename_all = "lowercase")]
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pub enum ConsistencyMode {
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@ -28,67 +22,3 @@ impl ConsistencyMode {
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impl AutoCrdt for ConsistencyMode {
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const WARN_IF_DIFFERENT: bool = true;
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}
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impl ReplicationFactor {
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pub fn new(replication_factor: usize) -> Option<Self> {
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if replication_factor < 1 {
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None
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} else {
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Some(Self(replication_factor))
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}
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}
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pub fn replication_factor(&self) -> usize {
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self.0
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}
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pub fn read_quorum(&self, consistency_mode: ConsistencyMode) -> usize {
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match consistency_mode {
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ConsistencyMode::Dangerous | ConsistencyMode::Degraded => 1,
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ConsistencyMode::Consistent => self.replication_factor().div_ceil(2),
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}
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}
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pub fn write_quorum(&self, consistency_mode: ConsistencyMode) -> usize {
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match consistency_mode {
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ConsistencyMode::Dangerous => 1,
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ConsistencyMode::Degraded | ConsistencyMode::Consistent => {
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(self.replication_factor() + 1) - self.read_quorum(ConsistencyMode::Consistent)
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}
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}
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}
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}
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impl std::convert::From<ReplicationFactor> for usize {
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fn from(replication_factor: ReplicationFactor) -> usize {
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replication_factor.0
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}
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}
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pub fn parse_replication_mode(
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config: &Config,
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) -> Result<(ReplicationFactor, ConsistencyMode), Error> {
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match (&config.replication_mode, config.replication_factor, config.consistency_mode.as_str()) {
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(Some(replication_mode), None, "consistent") => {
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tracing::warn!("Legacy config option replication_mode in use. Please migrate to replication_factor and consistency_mode");
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let parsed_replication_mode = match replication_mode.as_str() {
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"1" | "none" => Some((ReplicationFactor(1), ConsistencyMode::Consistent)),
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"2" => Some((ReplicationFactor(2), ConsistencyMode::Consistent)),
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"2-dangerous" => Some((ReplicationFactor(2), ConsistencyMode::Dangerous)),
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"3" => Some((ReplicationFactor(3), ConsistencyMode::Consistent)),
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"3-degraded" => Some((ReplicationFactor(3), ConsistencyMode::Degraded)),
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"3-dangerous" => Some((ReplicationFactor(3), ConsistencyMode::Dangerous)),
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_ => None,
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};
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Some(parsed_replication_mode.ok_or_message("Invalid replication_mode in config file.")?)
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},
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(None, Some(replication_factor), consistency_mode) => {
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let replication_factor = ReplicationFactor::new(replication_factor)
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.ok_or_message("Invalid replication_factor in config file.")?;
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let consistency_mode = ConsistencyMode::parse(consistency_mode)
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.ok_or_message("Invalid consistency_mode in config file.")?;
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Some((replication_factor, consistency_mode))
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}
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_ => None,
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}.ok_or_message("Either the legacy replication_mode or replication_level and consistency_mode can be set, not both.")
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}
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@ -112,8 +112,6 @@ pub struct System {
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metrics: ArcSwapOption<SystemMetrics>,
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pub(crate) replication_factor: ReplicationFactor,
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/// Path to metadata directory
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pub metadata_dir: PathBuf,
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/// Path to data directory
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@ -125,9 +123,6 @@ pub struct NodeStatus {
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/// Hostname of the node
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pub hostname: Option<String>,
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/// Replication factor configured on the node
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pub replication_factor: usize,
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/// Cluster layout digest
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pub layout_digest: RpcLayoutDigest,
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@ -242,7 +237,6 @@ impl System {
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/// Create this node's membership manager
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pub fn new(
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network_key: NetworkKey,
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replication_factor: ReplicationFactor,
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consistency_mode: ConsistencyMode,
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config: &Config,
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) -> Result<Arc<Self>, Error> {
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@ -279,11 +273,10 @@ impl System {
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netapp.id,
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system_endpoint.clone(),
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peering.clone(),
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replication_factor,
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consistency_mode,
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)?;
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let mut local_status = NodeStatus::initial(replication_factor, &layout_manager);
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let mut local_status = NodeStatus::initial(&layout_manager);
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local_status.update_disk_usage(&config.metadata_dir, &config.data_dir);
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// ---- if enabled, set up additionnal peer discovery methods ----
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@ -314,7 +307,6 @@ impl System {
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netapp: netapp.clone(),
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peering: peering.clone(),
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system_endpoint,
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replication_factor,
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rpc_listen_addr: config.rpc_bind_addr,
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rpc_public_addr,
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bootstrap_peers: config.bootstrap_peers.clone(),
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@ -429,10 +421,6 @@ impl System {
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}
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pub fn health(&self) -> ClusterHealth {
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let quorum = self
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.replication_factor
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.write_quorum(ConsistencyMode::Consistent);
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// Gather information about running nodes.
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// Technically, `nodes` contains currently running nodes, as well
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// as nodes that this Garage process has been connected to at least
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@ -465,6 +453,7 @@ impl System {
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// Determine the number of partitions that have:
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// - a quorum of up nodes for all write sets (i.e. are available)
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// - for which all nodes in all write sets are up (i.e. are fully healthy)
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let quorum = layout.current().write_quorum(ConsistencyMode::Consistent);
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let partitions = layout.current().partitions().collect::<Vec<_>>();
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let mut partitions_quorum = 0;
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let mut partitions_all_ok = 0;
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@ -580,13 +569,6 @@ impl System {
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) -> Result<SystemRpc, Error> {
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let local_info = self.local_status.read().unwrap();
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if local_info.replication_factor < info.replication_factor {
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error!("Some node have a higher replication factor ({}) than this one ({}). This is not supported and will lead to data corruption. Shutting down for safety.",
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info.replication_factor,
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local_info.replication_factor);
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std::process::exit(1);
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}
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self.layout_manager
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.handle_advertise_status(from, &info.layout_digest);
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|
@ -635,7 +617,7 @@ impl System {
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.count();
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let not_configured = !self.cluster_layout().is_check_ok();
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let no_peers = n_connected < self.replication_factor.into();
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let no_peers = n_connected < self.cluster_layout().current().replication_factor;
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let expected_n_nodes = self.cluster_layout().all_nodes().len();
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let bad_peers = n_connected != expected_n_nodes;
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@ -781,14 +763,13 @@ impl EndpointHandler<SystemRpc> for System {
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}
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impl NodeStatus {
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fn initial(replication_factor: ReplicationFactor, layout_manager: &LayoutManager) -> Self {
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fn initial(layout_manager: &LayoutManager) -> Self {
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NodeStatus {
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hostname: Some(
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gethostname::gethostname()
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.into_string()
|
||||
.unwrap_or_else(|_| "<invalid utf-8>".to_string()),
|
||||
),
|
||||
replication_factor: replication_factor.into(),
|
||||
layout_digest: layout_manager.layout().digest(),
|
||||
meta_disk_avail: None,
|
||||
data_disk_avail: None,
|
||||
|
@ -798,7 +779,6 @@ impl NodeStatus {
|
|||
fn unknown() -> Self {
|
||||
NodeStatus {
|
||||
hostname: None,
|
||||
replication_factor: 0,
|
||||
layout_digest: Default::default(),
|
||||
meta_disk_avail: None,
|
||||
data_disk_avail: None,
|
||||
|
|
|
@ -65,10 +65,13 @@ impl SystemMetrics {
|
|||
.with_description("Garage build info")
|
||||
.init(),
|
||||
_replication_factor: {
|
||||
let replication_factor = system.replication_factor;
|
||||
let system = system.clone();
|
||||
meter
|
||||
.u64_value_observer("garage_replication_factor", move |observer| {
|
||||
observer.observe(replication_factor.replication_factor() as u64, &[])
|
||||
observer.observe(
|
||||
system.cluster_layout().current().replication_factor as u64,
|
||||
&[],
|
||||
)
|
||||
})
|
||||
.with_description("Garage replication factor setting")
|
||||
.init()
|
||||
|
|
|
@ -1,9 +1,10 @@
|
|||
use std::sync::Arc;
|
||||
|
||||
use garage_rpc::layout::*;
|
||||
use garage_rpc::system::System;
|
||||
use garage_rpc::replication_mode::ConsistencyMode;
|
||||
use garage_util::data::*;
|
||||
|
||||
use crate::replication::sharded::manager::LayoutManager;
|
||||
use crate::replication::*;
|
||||
|
||||
/// Sharded replication schema:
|
||||
|
@ -15,42 +16,43 @@ use crate::replication::*;
|
|||
#[derive(Clone)]
|
||||
pub struct TableShardedReplication {
|
||||
/// The membership manager of this node
|
||||
pub system: Arc<System>,
|
||||
/// How many time each data should be replicated
|
||||
pub replication_factor: usize,
|
||||
/// How many nodes to contact for a read, should be at most `replication_factor`
|
||||
pub read_quorum: usize,
|
||||
/// How many nodes to contact for a write, should be at most `replication_factor`
|
||||
pub write_quorum: usize,
|
||||
pub layout_manager: Arc<LayoutManager>,
|
||||
pub consistency_mode: ConsistencyMode,
|
||||
}
|
||||
|
||||
impl TableReplication for TableShardedReplication {
|
||||
type WriteSets = WriteLock<Vec<Vec<Uuid>>>;
|
||||
|
||||
fn storage_nodes(&self, hash: &Hash) -> Vec<Uuid> {
|
||||
self.system.cluster_layout().storage_nodes_of(hash)
|
||||
self.layout_manager.layout().storage_nodes_of(hash)
|
||||
}
|
||||
|
||||
fn read_nodes(&self, hash: &Hash) -> Vec<Uuid> {
|
||||
self.system.cluster_layout().read_nodes_of(hash)
|
||||
self.layout_manager.layout().read_nodes_of(hash)
|
||||
}
|
||||
fn read_quorum(&self) -> usize {
|
||||
self.read_quorum
|
||||
self.layout_manager
|
||||
.layout()
|
||||
.current()
|
||||
.read_quorum(self.consistency_mode)
|
||||
}
|
||||
|
||||
fn write_sets(&self, hash: &Hash) -> Self::WriteSets {
|
||||
self.system.layout_manager.write_sets_of(hash)
|
||||
self.layout_manager.write_sets_of(hash)
|
||||
}
|
||||
fn write_quorum(&self) -> usize {
|
||||
self.write_quorum
|
||||
self.layout_manager
|
||||
.layout()
|
||||
.current()
|
||||
.write_quorum(self.consistency_mode)
|
||||
}
|
||||
|
||||
fn partition_of(&self, hash: &Hash) -> Partition {
|
||||
self.system.cluster_layout().current().partition_of(hash)
|
||||
self.layout_manager.layout().current().partition_of(hash)
|
||||
}
|
||||
|
||||
fn sync_partitions(&self) -> SyncPartitions {
|
||||
let layout = self.system.cluster_layout();
|
||||
let layout = self.layout_manager.layout();
|
||||
let layout_version = layout.ack_map_min();
|
||||
|
||||
let mut partitions = layout
|
||||
|
|
|
@ -38,21 +38,12 @@ pub struct Config {
|
|||
)]
|
||||
pub block_size: usize,
|
||||
|
||||
/// Number of replicas. Can be any positive integer, but uneven numbers are more favorable.
|
||||
/// - 1 for single-node clusters, or to disable replication
|
||||
/// - 3 is the recommended and supported setting.
|
||||
#[serde(default)]
|
||||
pub replication_factor: Option<usize>,
|
||||
|
||||
/// Consistency mode for all for requests through this node
|
||||
/// - Degraded -> Disable read quorum
|
||||
/// - Dangerous -> Disable read and write quorum
|
||||
#[serde(default = "default_consistency_mode")]
|
||||
pub consistency_mode: String,
|
||||
|
||||
/// Legacy option
|
||||
pub replication_mode: Option<String>,
|
||||
|
||||
/// Zstd compression level used on data blocks
|
||||
#[serde(
|
||||
deserialize_with = "deserialize_compression",
|
||||
|
|
Loading…
Reference in a new issue