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ReplicationMode -> ConsistencyMode+ReplicationFactor

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This commit is contained in:
Yureka 2024-03-04 19:58:32 +01:00
parent 8f86af52ed
commit c1769bbe69
11 changed files with 162 additions and 105 deletions
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6
src/garage/secrets.rs
View file

@ -163,7 +163,7 @@ mod tests {
r#"
metadata_dir = "/tmp/garage/meta"
data_dir = "/tmp/garage/data"
replication_mode = "3"
replication_factor = 3
rpc_bind_addr = "[::]:3901"
rpc_secret_file = "{}"
@ -185,7 +185,7 @@ mod tests {
r#"
metadata_dir = "/tmp/garage/meta"
data_dir = "/tmp/garage/data"
replication_mode = "3"
replication_factor = 3
rpc_bind_addr = "[::]:3901"
rpc_secret_file = "{}"
allow_world_readable_secrets = true
@ -296,7 +296,7 @@ mod tests {
r#"
metadata_dir = "/tmp/garage/meta"
data_dir = "/tmp/garage/data"
replication_mode = "3"
replication_factor = 3
rpc_bind_addr = "[::]:3901"
rpc_secret= "dummy"
rpc_secret_file = "dummy"

2
src/garage/tests/common/garage.rs
View file

@ -54,7 +54,7 @@ metadata_dir = "{path}/meta"
data_dir = "{path}/data"
db_engine = "lmdb"
replication_mode = "1"
replication_factor = 1
rpc_bind_addr = "127.0.0.1:{rpc_port}"
rpc_public_addr = "127.0.0.1:{rpc_port}"

23
src/model/garage.rs
View file

@ -9,7 +9,7 @@ use garage_util::config::*;
use garage_util::error::*;
use garage_util::persister::PersisterShared;
use garage_rpc::replication_mode::ReplicationMode;
use garage_rpc::replication_mode::*;
use garage_rpc::system::System;
use garage_block::manager::*;
@ -39,8 +39,8 @@ pub struct Garage {
/// The set of background variables that can be viewed/modified at runtime
pub bg_vars: vars::BgVars,
/// The replication mode of this cluster
pub replication_mode: ReplicationMode,
/// The replication factor of this cluster
pub replication_factor: ReplicationFactor,
/// The local database
pub db: db::Db,
@ -222,27 +222,26 @@ impl Garage {
.and_then(|x| NetworkKey::from_slice(&x))
.ok_or_message("Invalid RPC secret key")?;
let replication_mode = ReplicationMode::parse(&config.replication_mode)
.ok_or_message("Invalid replication_mode in config file.")?;
let (replication_factor, consistency_mode) = parse_replication_mode(&config)?;
info!("Initialize background variable system...");
let mut bg_vars = vars::BgVars::new();
info!("Initialize membership management system...");
let system = System::new(network_key, replication_mode, &config)?;
let system = System::new(network_key, replication_factor, consistency_mode, &config)?;
let data_rep_param = TableShardedReplication {
system: system.clone(),
replication_factor: replication_mode.replication_factor(),
write_quorum: replication_mode.write_quorum(),
replication_factor: replication_factor.into(),
write_quorum: replication_factor.write_quorum(consistency_mode),
read_quorum: 1,
};
let meta_rep_param = TableShardedReplication {
system: system.clone(),
replication_factor: replication_mode.replication_factor(),
write_quorum: replication_mode.write_quorum(),
read_quorum: replication_mode.read_quorum(),
replication_factor: replication_factor.into(),
write_quorum: replication_factor.write_quorum(consistency_mode),
read_quorum: replication_factor.read_quorum(consistency_mode),
};
let control_rep_param = TableFullReplication {
@ -338,7 +337,7 @@ impl Garage {
Ok(Arc::new(Self {
config,
bg_vars,
replication_mode,
replication_factor,
db,
system,
block_manager,

18
src/rpc/layout/helper.rs
View file

@ -7,7 +7,7 @@ use serde::{Deserialize, Serialize};
use garage_util::data::*;
use super::*;
use crate::replication_mode::ReplicationMode;
use crate::replication_mode::*;
#[derive(Debug, Clone, Serialize, Deserialize, Default, PartialEq, Eq)]
pub struct RpcLayoutDigest {
@ -29,7 +29,8 @@ pub struct SyncLayoutDigest {
}
pub struct LayoutHelper {
replication_mode: ReplicationMode,
replication_factor: ReplicationFactor,
consistency_mode: ConsistencyMode,
layout: Option<LayoutHistory>,
// cached values
@ -57,7 +58,8 @@ impl Deref for LayoutHelper {
impl LayoutHelper {
pub fn new(
replication_mode: ReplicationMode,
replication_factor: ReplicationFactor,
consistency_mode: ConsistencyMode,
mut layout: LayoutHistory,
mut ack_lock: HashMap<u64, AtomicUsize>,
) -> Self {
@ -66,7 +68,7 @@ impl LayoutHelper {
// correct and we have rapid access to important values such as
// the layout versions to use when reading to ensure consistency.
if !replication_mode.is_read_after_write_consistent() {
if consistency_mode != ConsistencyMode::Consistent {
// Fast path for when no consistency is required.
// In this case we only need to keep the last version of the layout,
// we don't care about coordinating stuff in the cluster.
@ -103,7 +105,7 @@ impl LayoutHelper {
// This value is calculated using quorums to allow progress even
// if not all nodes have successfully completed a sync.
let sync_map_min =
layout.calculate_sync_map_min_with_quorum(replication_mode, &all_nongateway_nodes);
layout.calculate_sync_map_min_with_quorum(replication_factor, &all_nongateway_nodes);
let trackers_hash = layout.calculate_trackers_hash();
let staging_hash = layout.calculate_staging_hash();
@ -114,7 +116,8 @@ impl LayoutHelper {
.or_insert(AtomicUsize::new(0));
LayoutHelper {
replication_mode,
replication_factor,
consistency_mode,
layout: Some(layout),
ack_map_min,
sync_map_min,
@ -139,7 +142,8 @@ impl LayoutHelper {
let changed = f(self.layout.as_mut().unwrap());
if changed {
*self = Self::new(
self.replication_mode,
self.replication_factor,
self.consistency_mode,
self.layout.take().unwrap(),
std::mem::take(&mut self.ack_lock),
);

10
src/rpc/layout/history.rs
View file

@ -6,11 +6,11 @@ use garage_util::encode::nonversioned_encode;
use garage_util::error::*;
use super::*;
use crate::replication_mode::ReplicationMode;
use crate::replication_mode::*;
impl LayoutHistory {
pub fn new(replication_factor: usize) -> Self {
let version = LayoutVersion::new(replication_factor);
pub fn new(replication_factor: ReplicationFactor) -> Self {
let version = LayoutVersion::new(replication_factor.into());
let staging = LayoutStaging {
parameters: Lww::<LayoutParameters>::new(version.parameters),
@ -119,7 +119,7 @@ impl LayoutHistory {
pub(crate) fn calculate_sync_map_min_with_quorum(
&self,
replication_mode: ReplicationMode,
replication_factor: ReplicationFactor,
all_nongateway_nodes: &[Uuid],
) -> u64 {
// This function calculates the minimum layout version from which
@ -133,7 +133,7 @@ impl LayoutHistory {
return self.current().version;
}
let quorum = replication_mode.write_quorum();
let quorum = replication_factor.write_quorum(ConsistencyMode::Consistent);
let min_version = self.min_stored();
let global_min = self

27
src/rpc/layout/manager.rs
View file

@ -14,13 +14,13 @@ use garage_util::error::*;
use garage_util::persister::Persister;
use super::*;
use crate::replication_mode::ReplicationMode;
use crate::replication_mode::*;
use crate::rpc_helper::*;
use crate::system::*;
pub struct LayoutManager {
node_id: Uuid,
replication_mode: ReplicationMode,
replication_factor: ReplicationFactor,
persist_cluster_layout: Persister<LayoutHistory>,
layout: Arc<RwLock<LayoutHelper>>,
@ -38,20 +38,19 @@ impl LayoutManager {
node_id: NodeID,
system_endpoint: Arc<Endpoint<SystemRpc, System>>,
peering: Arc<PeeringManager>,
replication_mode: ReplicationMode,
replication_factor: ReplicationFactor,
consistency_mode: ConsistencyMode,
) -> Result<Arc<Self>, Error> {
let replication_factor = replication_mode.replication_factor();
let persist_cluster_layout: Persister<LayoutHistory> =
Persister::new(&config.metadata_dir, "cluster_layout");
let cluster_layout = match persist_cluster_layout.load() {
Ok(x) => {
if x.current().replication_factor != replication_mode.replication_factor() {
if x.current().replication_factor != replication_factor.replication_factor() {
return Err(Error::Message(format!(
"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.",
x.current().replication_factor,
replication_factor
replication_factor.replication_factor()
)));
}
x
@ -65,8 +64,12 @@ impl LayoutManager {
}
};
let mut cluster_layout =
LayoutHelper::new(replication_mode, cluster_layout, Default::default());
let mut cluster_layout = LayoutHelper::new(
replication_factor,
consistency_mode,
cluster_layout,
Default::default(),
);
cluster_layout.update_trackers(node_id.into());
let layout = Arc::new(RwLock::new(cluster_layout));
@ -81,7 +84,7 @@ impl LayoutManager {
Ok(Arc::new(Self {
node_id: node_id.into(),
replication_mode,
replication_factor,
persist_cluster_layout,
layout,
change_notify,
@ -295,11 +298,11 @@ impl LayoutManager {
adv.update_trackers
);
if adv.current().replication_factor != self.replication_mode.replication_factor() {
if adv.current().replication_factor != self.replication_factor.replication_factor() {
let msg = format!(
"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.",
adv.current().replication_factor,
self.replication_mode.replication_factor()
self.replication_factor.replication_factor()
);
error!("{}", msg);
return Err(Error::Message(msg));

3
src/rpc/layout/test.rs
View file

@ -5,6 +5,7 @@ use garage_util::crdt::Crdt;
use garage_util::error::*;
use crate::layout::*;
use crate::replication_mode::ReplicationFactor;
// This function checks that the partition size S computed is at least better than the
// one given by a very naive algorithm. To do so, we try to run the naive algorithm
@ -120,7 +121,7 @@ fn test_assignment() {
let mut node_capacity_vec = vec![4000, 1000, 2000];
let mut node_zone_vec = vec!["A", "B", "C"];
let mut cl = LayoutHistory::new(3);
let mut cl = LayoutHistory::new(ReplicationFactor::new(3).unwrap());
update_layout(&mut cl, &node_capacity_vec, &node_zone_vec, 3);
let v = cl.current().version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();

125
src/rpc/replication_mode.rs
View file

@ -1,57 +1,94 @@
#[derive(Clone, Copy)]
pub enum ReplicationMode {
None,
TwoWay,
TwoWayDangerous,
ThreeWay,
ThreeWayDegraded,
ThreeWayDangerous,
use garage_util::config::Config;
use garage_util::crdt::AutoCrdt;
use garage_util::error::*;
use serde::{Deserialize, Serialize};
#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
#[serde(transparent)]
pub struct ReplicationFactor(usize);
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Default, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum ConsistencyMode {
/// Read- and Write-quorum are 1
Dangerous,
/// Read-quorum is 1
Degraded,
/// Read- and Write-quorum are determined for read-after-write-consistency
#[default]
Consistent,
}
impl ReplicationMode {
pub fn parse(v: &str) -> Option<Self> {
match v {
"none" | "1" => Some(Self::None),
"2" => Some(Self::TwoWay),
"2-dangerous" => Some(Self::TwoWayDangerous),
"3" => Some(Self::ThreeWay),
"3-degraded" => Some(Self::ThreeWayDegraded),
"3-dangerous" => Some(Self::ThreeWayDangerous),
_ => None,
impl ConsistencyMode {
pub fn parse(s: &str) -> Option<Self> {
serde_json::from_value(serde_json::Value::String(s.to_string())).ok()
}
}
impl AutoCrdt for ConsistencyMode {
const WARN_IF_DIFFERENT: bool = true;
}
impl ReplicationFactor {
pub fn new(replication_factor: usize) -> Option<Self> {
if replication_factor < 1 {
None
} else {
Some(Self(replication_factor))
}
}
pub fn replication_factor(&self) -> usize {
match self {
Self::None => 1,
Self::TwoWay | Self::TwoWayDangerous => 2,
Self::ThreeWay | Self::ThreeWayDegraded | Self::ThreeWayDangerous => 3,
self.0
}
pub fn read_quorum(&self, consistency_mode: ConsistencyMode) -> usize {
match consistency_mode {
ConsistencyMode::Dangerous | ConsistencyMode::Degraded => 1,
ConsistencyMode::Consistent => self.replication_factor().div_ceil(2),
}
}
pub fn read_quorum(&self) -> usize {
match self {
Self::None => 1,
Self::TwoWay | Self::TwoWayDangerous => 1,
Self::ThreeWay => 2,
Self::ThreeWayDegraded | Self::ThreeWayDangerous => 1,
pub fn write_quorum(&self, consistency_mode: ConsistencyMode) -> usize {
match consistency_mode {
ConsistencyMode::Dangerous => 1,
ConsistencyMode::Degraded | ConsistencyMode::Consistent => {
(self.replication_factor() + 1) - self.read_quorum(ConsistencyMode::Consistent)
}
}
pub fn write_quorum(&self) -> usize {
match self {
Self::None => 1,
Self::TwoWay => 2,
Self::TwoWayDangerous => 1,
Self::ThreeWay | Self::ThreeWayDegraded => 2,
Self::ThreeWayDangerous => 1,
}
}
pub fn is_read_after_write_consistent(&self) -> bool {
match self {
Self::None | Self::TwoWay | Self::ThreeWay => true,
_ => false,
}
}
}
impl std::convert::From<ReplicationFactor> for usize {
fn from(replication_factor: ReplicationFactor) -> usize {
replication_factor.0
}
}
pub fn parse_replication_mode(
config: &Config,
) -> Result<(ReplicationFactor, ConsistencyMode), Error> {
match (&config.replication_mode, config.replication_factor, config.consistency_mode.as_str()) {
(Some(replication_mode), None, "consistent") => {
tracing::warn!("Legacy config option replication_mode in use. Please migrate to replication_factor and consistency_mode");
let parsed_replication_mode = match replication_mode.as_str() {
"1" | "none" => Some((ReplicationFactor(1), ConsistencyMode::Consistent)),
"2" => Some((ReplicationFactor(2), ConsistencyMode::Consistent)),
"2-dangerous" => Some((ReplicationFactor(2), ConsistencyMode::Dangerous)),
"3" => Some((ReplicationFactor(3), ConsistencyMode::Consistent)),
"3-degraded" => Some((ReplicationFactor(3), ConsistencyMode::Degraded)),
"3-dangerous" => Some((ReplicationFactor(3), ConsistencyMode::Dangerous)),
_ => None,
};
Some(parsed_replication_mode.ok_or_message("Invalid replication_mode in config file.")?)
},
(None, Some(replication_factor), consistency_mode) => {
let replication_factor = ReplicationFactor::new(replication_factor)
.ok_or_message("Invalid replication_factor in config file.")?;
let consistency_mode = ConsistencyMode::parse(consistency_mode)
.ok_or_message("Invalid consistency_mode in config file.")?;
Some((replication_factor, consistency_mode))
}
_ => None,
}.ok_or_message("Either the legacy replication_mode or replication_level and consistency_mode can be set, not both.")
}

22
src/rpc/system.rs
View file

@ -112,8 +112,7 @@ pub struct System {
metrics: ArcSwapOption<SystemMetrics>,
replication_mode: ReplicationMode,
pub(crate) replication_factor: usize,
pub(crate) replication_factor: ReplicationFactor,
/// Path to metadata directory
pub metadata_dir: PathBuf,
@ -243,7 +242,8 @@ impl System {
/// Create this node's membership manager
pub fn new(
network_key: NetworkKey,
replication_mode: ReplicationMode,
replication_factor: ReplicationFactor,
consistency_mode: ConsistencyMode,
config: &Config,
) -> Result<Arc<Self>, Error> {
// ---- setup netapp RPC protocol ----
@ -274,14 +274,13 @@ impl System {
let persist_peer_list = Persister::new(&config.metadata_dir, "peer_list");
// ---- setup cluster layout and layout manager ----
let replication_factor = replication_mode.replication_factor();
let layout_manager = LayoutManager::new(
config,
netapp.id,
system_endpoint.clone(),
peering.clone(),
replication_mode,
replication_factor,
consistency_mode,
)?;
let mut local_status = NodeStatus::initial(replication_factor, &layout_manager);
@ -315,7 +314,6 @@ impl System {
netapp: netapp.clone(),
peering: peering.clone(),
system_endpoint,
replication_mode,
replication_factor,
rpc_listen_addr: config.rpc_bind_addr,
rpc_public_addr,
@ -427,7 +425,9 @@ impl System {
}
pub fn health(&self) -> ClusterHealth {
let quorum = self.replication_mode.write_quorum();
let quorum = self
.replication_factor
.write_quorum(ConsistencyMode::Consistent);
// Gather information about running nodes.
// Technically, `nodes` contains currently running nodes, as well
@ -631,7 +631,7 @@ impl System {
.count();
let not_configured = self.cluster_layout().check().is_err();
let no_peers = n_connected < self.replication_factor;
let no_peers = n_connected < self.replication_factor.into();
let expected_n_nodes = self.cluster_layout().all_nodes().len();
let bad_peers = n_connected != expected_n_nodes;
@ -774,14 +774,14 @@ impl EndpointHandler<SystemRpc> for System {
}
impl NodeStatus {
fn initial(replication_factor: usize, layout_manager: &LayoutManager) -> Self {
fn initial(replication_factor: ReplicationFactor, layout_manager: &LayoutManager) -> Self {
NodeStatus {
hostname: Some(
gethostname::gethostname()
.into_string()
.unwrap_or_else(|_| "<invalid utf-8>".to_string()),
),
replication_factor,
replication_factor: replication_factor.into(),
layout_digest: layout_manager.layout().digest(),
meta_disk_avail: None,
data_disk_avail: None,

2
src/rpc/system_metrics.rs
View file

@ -68,7 +68,7 @@ impl SystemMetrics {
let replication_factor = system.replication_factor;
meter
.u64_value_observer("garage_replication_factor", move |observer| {
observer.observe(replication_factor as u64, &[])
observer.observe(replication_factor.replication_factor() as u64, &[])
})
.with_description("Garage replication factor setting")
.init()

27
src/util/config.rs
View file

@ -30,12 +30,20 @@ pub struct Config {
)]
pub block_size: usize,
/// Replication mode. Supported values:
/// - none, 1 -> no replication
/// - 2 -> 2-way replication
/// - 3 -> 3-way replication
// (we can add more aliases for this later)
pub replication_mode: String,
/// 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(
@ -244,10 +252,15 @@ fn default_sled_cache_capacity() -> usize {
fn default_sled_flush_every_ms() -> u64 {
2000
}
fn default_block_size() -> usize {
1048576
}
fn default_consistency_mode() -> String {
"consistent".into()
}
fn default_compression() -> Option<i32> {
Some(1)
}
@ -359,7 +372,7 @@ mod tests {
r#"
metadata_dir = "/tmp/garage/meta"
data_dir = "/tmp/garage/data"
replication_mode = "3"
replication_factor = 3
rpc_bind_addr = "[::]:3901"
rpc_secret = "foo"