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neon/storage_controller/src/persistence.rs
Vlad Lazar 793b5061ec storcon: track pageserver availability zone (#8852) 
## Problem
In order to build AZ aware scheduling, the storage controller needs to
know what AZ pageservers are in.

Related https://github.com/neondatabase/neon/issues/8848

## Summary of changes
This patch set adds a new nullable column to the `nodes` table:
`availability_zone_id`. The node registration
request is extended to include the AZ id (pageservers already have this
in their `metadata.json` file).

If the node is already registered, then we update the persistent and
in-memory state with the provided AZ.
Otherwise, we add the node with the AZ to begin with.

A couple assumptions are made here:
1. Pageserver AZ ids are stable
2. AZ ids do not change over time

Once all pageservers have a configured AZ, we can remove the optionals
in the code and make the database column not nullable.
2024-08-28 18:23:55 +01:00

1070 lines
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pub(crate) mod split_state;
use std::collections::HashMap;
use std::str::FromStr;
use std::time::Duration;
use std::time::Instant;
use self::split_state::SplitState;
use diesel::pg::PgConnection;
use diesel::prelude::*;
use diesel::Connection;
use pageserver_api::controller_api::MetadataHealthRecord;
use pageserver_api::controller_api::ShardSchedulingPolicy;
use pageserver_api::controller_api::{NodeSchedulingPolicy, PlacementPolicy};
use pageserver_api::models::TenantConfig;
use pageserver_api::shard::ShardConfigError;
use pageserver_api::shard::ShardIdentity;
use pageserver_api::shard::ShardStripeSize;
use pageserver_api::shard::{ShardCount, ShardNumber, TenantShardId};
use serde::{Deserialize, Serialize};
use utils::generation::Generation;
use utils::id::{NodeId, TenantId};
use crate::metrics::{
DatabaseQueryErrorLabelGroup, DatabaseQueryLatencyLabelGroup, METRICS_REGISTRY,
};
use crate::node::Node;
use diesel_migrations::{embed_migrations, EmbeddedMigrations};
const MIGRATIONS: EmbeddedMigrations = embed_migrations!("./migrations");
/// ## What do we store?
///
/// The storage controller service does not store most of its state durably.
///
/// The essential things to store durably are:
/// - generation numbers, as these must always advance monotonically to ensure data safety.
/// - Tenant's PlacementPolicy and TenantConfig, as the source of truth for these is something external.
/// - Node's scheduling policies, as the source of truth for these is something external.
///
/// Other things we store durably as an implementation detail:
/// - Node's host/port: this could be avoided it we made nodes emit a self-registering heartbeat,
/// but it is operationally simpler to make this service the authority for which nodes
/// it talks to.
///
/// ## Performance/efficiency
///
/// The storage controller service does not go via the database for most things: there are
/// a couple of places where we must, and where efficiency matters:
/// - Incrementing generation numbers: the Reconciler has to wait for this to complete
/// before it can attach a tenant, so this acts as a bound on how fast things like
/// failover can happen.
/// - Pageserver re-attach: we will increment many shards' generations when this happens,
/// so it is important to avoid e.g. issuing O(N) queries.
///
/// Database calls relating to nodes have low performance requirements, as they are very rarely
/// updated, and reads of nodes are always from memory, not the database. We only require that
/// we can UPDATE a node's scheduling mode reasonably quickly to mark a bad node offline.
pub struct Persistence {
connection_pool: diesel::r2d2::Pool<diesel::r2d2::ConnectionManager<PgConnection>>,
}
/// Legacy format, for use in JSON compat objects in test environment
#[derive(Serialize, Deserialize)]
struct JsonPersistence {
tenants: HashMap<TenantShardId, TenantShardPersistence>,
}
#[derive(thiserror::Error, Debug)]
pub(crate) enum DatabaseError {
#[error(transparent)]
Query(#[from] diesel::result::Error),
#[error(transparent)]
Connection(#[from] diesel::result::ConnectionError),
#[error(transparent)]
ConnectionPool(#[from] r2d2::Error),
#[error("Logical error: {0}")]
Logical(String),
#[error("Migration error: {0}")]
Migration(String),
}
#[derive(measured::FixedCardinalityLabel, Copy, Clone)]
pub(crate) enum DatabaseOperation {
InsertNode,
UpdateNode,
DeleteNode,
ListNodes,
BeginShardSplit,
CompleteShardSplit,
AbortShardSplit,
Detach,
ReAttach,
IncrementGeneration,
PeekGenerations,
ListTenantShards,
InsertTenantShards,
UpdateTenantShard,
DeleteTenant,
UpdateTenantConfig,
UpdateMetadataHealth,
ListMetadataHealth,
ListMetadataHealthUnhealthy,
ListMetadataHealthOutdated,
GetLeader,
UpdateLeader,
SetNodeAzId,
}
#[must_use]
pub(crate) enum AbortShardSplitStatus {
/// We aborted the split in the database by reverting to the parent shards
Aborted,
/// The split had already been persisted.
Complete,
}
pub(crate) type DatabaseResult<T> = Result<T, DatabaseError>;
/// Some methods can operate on either a whole tenant or a single shard
pub(crate) enum TenantFilter {
Tenant(TenantId),
Shard(TenantShardId),
}
impl Persistence {
// The default postgres connection limit is 100. We use up to 99, to leave one free for a human admin under
// normal circumstances. This assumes we have exclusive use of the database cluster to which we connect.
pub const MAX_CONNECTIONS: u32 = 99;
// We don't want to keep a lot of connections alive: close them down promptly if they aren't being used.
const IDLE_CONNECTION_TIMEOUT: Duration = Duration::from_secs(10);
const MAX_CONNECTION_LIFETIME: Duration = Duration::from_secs(60);
pub fn new(database_url: String) -> Self {
let manager = diesel::r2d2::ConnectionManager::<PgConnection>::new(database_url);
// We will use a connection pool: this is primarily to _limit_ our connection count, rather than to optimize time
// to execute queries (database queries are not generally on latency-sensitive paths).
let connection_pool = diesel::r2d2::Pool::builder()
.max_size(Self::MAX_CONNECTIONS)
.max_lifetime(Some(Self::MAX_CONNECTION_LIFETIME))
.idle_timeout(Some(Self::IDLE_CONNECTION_TIMEOUT))
// Always keep at least one connection ready to go
.min_idle(Some(1))
.test_on_check_out(true)
.build(manager)
.expect("Could not build connection pool");
Self { connection_pool }
}
/// A helper for use during startup, where we would like to tolerate concurrent restarts of the
/// database and the storage controller, therefore the database might not be available right away
pub async fn await_connection(
database_url: &str,
timeout: Duration,
) -> Result<(), diesel::ConnectionError> {
let started_at = Instant::now();
loop {
match PgConnection::establish(database_url) {
Ok(_) => {
tracing::info!("Connected to database.");
return Ok(());
}
Err(e) => {
if started_at.elapsed() > timeout {
return Err(e);
} else {
tracing::info!("Database not yet available, waiting... ({e})");
tokio::time::sleep(Duration::from_millis(100)).await;
}
}
}
}
}
/// Execute the diesel migrations that are built into this binary
pub(crate) async fn migration_run(&self) -> DatabaseResult<()> {
use diesel_migrations::{HarnessWithOutput, MigrationHarness};
self.with_conn(move |conn| -> DatabaseResult<()> {
HarnessWithOutput::write_to_stdout(conn)
.run_pending_migrations(MIGRATIONS)
.map(|_| ())
.map_err(|e| DatabaseError::Migration(e.to_string()))
})
.await
}
/// Wraps `with_conn` in order to collect latency and error metrics
async fn with_measured_conn<F, R>(&self, op: DatabaseOperation, func: F) -> DatabaseResult<R>
where
F: Fn(&mut PgConnection) -> DatabaseResult<R> + Send + 'static,
R: Send + 'static,
{
let latency = &METRICS_REGISTRY
.metrics_group
.storage_controller_database_query_latency;
let _timer = latency.start_timer(DatabaseQueryLatencyLabelGroup { operation: op });
let res = self.with_conn(func).await;
if let Err(err) = &res {
let error_counter = &METRICS_REGISTRY
.metrics_group
.storage_controller_database_query_error;
error_counter.inc(DatabaseQueryErrorLabelGroup {
error_type: err.error_label(),
operation: op,
})
}
res
}
/// Call the provided function in a tokio blocking thread, with a Diesel database connection.
async fn with_conn<F, R>(&self, func: F) -> DatabaseResult<R>
where
F: Fn(&mut PgConnection) -> DatabaseResult<R> + Send + 'static,
R: Send + 'static,
{
// A generous allowance for how many times we may retry serializable transactions
// before giving up. This is not expected to be hit: it is a defensive measure in case we
// somehow engineer a situation where duelling transactions might otherwise live-lock.
const MAX_RETRIES: usize = 128;
let mut conn = self.connection_pool.get()?;
tokio::task::spawn_blocking(move || -> DatabaseResult<R> {
let mut retry_count = 0;
loop {
match conn.build_transaction().serializable().run(|c| func(c)) {
Ok(r) => break Ok(r),
Err(
err @ DatabaseError::Query(diesel::result::Error::DatabaseError(
diesel::result::DatabaseErrorKind::SerializationFailure,
_,
)),
) => {
retry_count += 1;
if retry_count > MAX_RETRIES {
tracing::error!(
"Exceeded max retries on SerializationFailure errors: {err:?}"
);
break Err(err);
} else {
// Retry on serialization errors: these are expected, because even though our
// transactions don't fight for the same rows, they will occasionally collide
// on index pages (e.g. increment_generation for unrelated shards can collide)
tracing::debug!(
"Retrying transaction on serialization failure {err:?}"
);
continue;
}
}
Err(e) => break Err(e),
}
}
})
.await
.expect("Task panic")
}
/// When a node is first registered, persist it before using it for anything
pub(crate) async fn insert_node(&self, node: &Node) -> DatabaseResult<()> {
let np = node.to_persistent();
self.with_measured_conn(
DatabaseOperation::InsertNode,
move |conn| -> DatabaseResult<()> {
diesel::insert_into(crate::schema::nodes::table)
.values(&np)
.execute(conn)?;
Ok(())
},
)
.await
}
/// At startup, populate the list of nodes which our shards may be placed on
pub(crate) async fn list_nodes(&self) -> DatabaseResult<Vec<NodePersistence>> {
let nodes: Vec<NodePersistence> = self
.with_measured_conn(
DatabaseOperation::ListNodes,
move |conn| -> DatabaseResult<_> {
Ok(crate::schema::nodes::table.load::<NodePersistence>(conn)?)
},
)
.await?;
tracing::info!("list_nodes: loaded {} nodes", nodes.len());
Ok(nodes)
}
pub(crate) async fn update_node(
&self,
input_node_id: NodeId,
input_scheduling: NodeSchedulingPolicy,
) -> DatabaseResult<()> {
use crate::schema::nodes::dsl::*;
let updated = self
.with_measured_conn(DatabaseOperation::UpdateNode, move |conn| {
let updated = diesel::update(nodes)
.filter(node_id.eq(input_node_id.0 as i64))
.set((scheduling_policy.eq(String::from(input_scheduling)),))
.execute(conn)?;
Ok(updated)
})
.await?;
if updated != 1 {
Err(DatabaseError::Logical(format!(
"Node {node_id:?} not found for update",
)))
} else {
Ok(())
}
}
pub(crate) async fn set_node_availability_zone_id(
&self,
input_node_id: NodeId,
input_az_id: String,
) -> DatabaseResult<()> {
use crate::schema::nodes::dsl::*;
let updated = self
.with_measured_conn(DatabaseOperation::SetNodeAzId, move |conn| {
let updated = diesel::update(nodes)
.filter(node_id.eq(input_node_id.0 as i64))
.set((availability_zone_id.eq(input_az_id.clone()),))
.execute(conn)?;
Ok(updated)
})
.await?;
if updated != 1 {
Err(DatabaseError::Logical(format!(
"Node {node_id:?} not found for setting az id",
)))
} else {
Ok(())
}
}
/// At startup, load the high level state for shards, such as their config + policy. This will
/// be enriched at runtime with state discovered on pageservers.
pub(crate) async fn list_tenant_shards(&self) -> DatabaseResult<Vec<TenantShardPersistence>> {
self.with_measured_conn(
DatabaseOperation::ListTenantShards,
move |conn| -> DatabaseResult<_> {
Ok(crate::schema::tenant_shards::table.load::<TenantShardPersistence>(conn)?)
},
)
.await
}
/// Tenants must be persisted before we schedule them for the first time. This enables us
/// to correctly retain generation monotonicity, and the externally provided placement policy & config.
pub(crate) async fn insert_tenant_shards(
&self,
shards: Vec<TenantShardPersistence>,
) -> DatabaseResult<()> {
use crate::schema::metadata_health;
use crate::schema::tenant_shards;
let now = chrono::Utc::now();
let metadata_health_records = shards
.iter()
.map(|t| MetadataHealthPersistence {
tenant_id: t.tenant_id.clone(),
shard_number: t.shard_number,
shard_count: t.shard_count,
healthy: true,
last_scrubbed_at: now,
})
.collect::<Vec<_>>();
self.with_measured_conn(
DatabaseOperation::InsertTenantShards,
move |conn| -> DatabaseResult<()> {
diesel::insert_into(tenant_shards::table)
.values(&shards)
.execute(conn)?;
diesel::insert_into(metadata_health::table)
.values(&metadata_health_records)
.execute(conn)?;
Ok(())
},
)
.await
}
/// Ordering: call this _after_ deleting the tenant on pageservers, but _before_ dropping state for
/// the tenant from memory on this server.
pub(crate) async fn delete_tenant(&self, del_tenant_id: TenantId) -> DatabaseResult<()> {
use crate::schema::tenant_shards::dsl::*;
self.with_measured_conn(
DatabaseOperation::DeleteTenant,
move |conn| -> DatabaseResult<()> {
// `metadata_health` status (if exists) is also deleted based on the cascade behavior.
diesel::delete(tenant_shards)
.filter(tenant_id.eq(del_tenant_id.to_string()))
.execute(conn)?;
Ok(())
},
)
.await
}
pub(crate) async fn delete_node(&self, del_node_id: NodeId) -> DatabaseResult<()> {
use crate::schema::nodes::dsl::*;
self.with_measured_conn(
DatabaseOperation::DeleteNode,
move |conn| -> DatabaseResult<()> {
diesel::delete(nodes)
.filter(node_id.eq(del_node_id.0 as i64))
.execute(conn)?;
Ok(())
},
)
.await
}
/// When a tenant invokes the /re-attach API, this function is responsible for doing an efficient
/// batched increment of the generations of all tenants whose generation_pageserver is equal to
/// the node that called /re-attach.
#[tracing::instrument(skip_all, fields(node_id))]
pub(crate) async fn re_attach(
&self,
input_node_id: NodeId,
) -> DatabaseResult<HashMap<TenantShardId, Generation>> {
use crate::schema::nodes::dsl::scheduling_policy;
use crate::schema::nodes::dsl::*;
use crate::schema::tenant_shards::dsl::*;
let updated = self
.with_measured_conn(DatabaseOperation::ReAttach, move |conn| {
let rows_updated = diesel::update(tenant_shards)
.filter(generation_pageserver.eq(input_node_id.0 as i64))
.set(generation.eq(generation + 1))
.execute(conn)?;
tracing::info!("Incremented {} tenants' generations", rows_updated);
// TODO: UPDATE+SELECT in one query
let updated = tenant_shards
.filter(generation_pageserver.eq(input_node_id.0 as i64))
.select(TenantShardPersistence::as_select())
.load(conn)?;
// If the node went through a drain and restart phase before re-attaching,
// then reset it's node scheduling policy to active.
diesel::update(nodes)
.filter(node_id.eq(input_node_id.0 as i64))
.filter(
scheduling_policy
.eq(String::from(NodeSchedulingPolicy::PauseForRestart))
.or(scheduling_policy.eq(String::from(NodeSchedulingPolicy::Draining)))
.or(scheduling_policy.eq(String::from(NodeSchedulingPolicy::Filling))),
)
.set(scheduling_policy.eq(String::from(NodeSchedulingPolicy::Active)))
.execute(conn)?;
Ok(updated)
})
.await?;
let mut result = HashMap::new();
for tsp in updated {
let tenant_shard_id = TenantShardId {
tenant_id: TenantId::from_str(tsp.tenant_id.as_str())
.map_err(|e| DatabaseError::Logical(format!("Malformed tenant id: {e}")))?,
shard_number: ShardNumber(tsp.shard_number as u8),
shard_count: ShardCount::new(tsp.shard_count as u8),
};
let Some(g) = tsp.generation else {
// If the generation_pageserver column was non-NULL, then the generation column should also be non-NULL:
// we only set generation_pageserver when setting generation.
return Err(DatabaseError::Logical(
"Generation should always be set after incrementing".to_string(),
));
};
result.insert(tenant_shard_id, Generation::new(g as u32));
}
Ok(result)
}
/// Reconciler calls this immediately before attaching to a new pageserver, to acquire a unique, monotonically
/// advancing generation number. We also store the NodeId for which the generation was issued, so that in
/// [`Self::re_attach`] we can do a bulk UPDATE on the generations for that node.
pub(crate) async fn increment_generation(
&self,
tenant_shard_id: TenantShardId,
node_id: NodeId,
) -> anyhow::Result<Generation> {
use crate::schema::tenant_shards::dsl::*;
let updated = self
.with_measured_conn(DatabaseOperation::IncrementGeneration, move |conn| {
let updated = diesel::update(tenant_shards)
.filter(tenant_id.eq(tenant_shard_id.tenant_id.to_string()))
.filter(shard_number.eq(tenant_shard_id.shard_number.0 as i32))
.filter(shard_count.eq(tenant_shard_id.shard_count.literal() as i32))
.set((
generation.eq(generation + 1),
generation_pageserver.eq(node_id.0 as i64),
))
// TODO: only returning() the generation column
.returning(TenantShardPersistence::as_returning())
.get_result(conn)?;
Ok(updated)
})
.await?;
// Generation is always non-null in the rseult: if the generation column had been NULL, then we
// should have experienced an SQL Confilict error while executing a query that tries to increment it.
debug_assert!(updated.generation.is_some());
let Some(g) = updated.generation else {
return Err(DatabaseError::Logical(
"Generation should always be set after incrementing".to_string(),
)
.into());
};
Ok(Generation::new(g as u32))
}
/// When we want to call out to the running shards for a tenant, e.g. during timeline CRUD operations,
/// we need to know where the shard is attached, _and_ the generation, so that we can re-check the generation
/// afterwards to confirm that our timeline CRUD operation is truly persistent (it must have happened in the
/// latest generation)
///
/// If the tenant doesn't exist, an empty vector is returned.
///
/// Output is sorted by shard number
pub(crate) async fn peek_generations(
&self,
filter_tenant_id: TenantId,
) -> Result<Vec<(TenantShardId, Option<Generation>, Option<NodeId>)>, DatabaseError> {
use crate::schema::tenant_shards::dsl::*;
let rows = self
.with_measured_conn(DatabaseOperation::PeekGenerations, move |conn| {
let result = tenant_shards
.filter(tenant_id.eq(filter_tenant_id.to_string()))
.select(TenantShardPersistence::as_select())
.order(shard_number)
.load(conn)?;
Ok(result)
})
.await?;
Ok(rows
.into_iter()
.map(|p| {
(
p.get_tenant_shard_id()
.expect("Corrupt tenant shard id in database"),
p.generation.map(|g| Generation::new(g as u32)),
p.generation_pageserver.map(|n| NodeId(n as u64)),
)
})
.collect())
}
#[allow(non_local_definitions)]
/// For use when updating a persistent property of a tenant, such as its config or placement_policy.
///
/// Do not use this for settting generation, unless in the special onboarding code path (/location_config)
/// API: use [`Self::increment_generation`] instead. Setting the generation via this route is a one-time thing
/// that we only do the first time a tenant is set to an attached policy via /location_config.
pub(crate) async fn update_tenant_shard(
&self,
tenant: TenantFilter,
input_placement_policy: Option<PlacementPolicy>,
input_config: Option<TenantConfig>,
input_generation: Option<Generation>,
input_scheduling_policy: Option<ShardSchedulingPolicy>,
) -> DatabaseResult<()> {
use crate::schema::tenant_shards::dsl::*;
self.with_measured_conn(DatabaseOperation::UpdateTenantShard, move |conn| {
let query = match tenant {
TenantFilter::Shard(tenant_shard_id) => diesel::update(tenant_shards)
.filter(tenant_id.eq(tenant_shard_id.tenant_id.to_string()))
.filter(shard_number.eq(tenant_shard_id.shard_number.0 as i32))
.filter(shard_count.eq(tenant_shard_id.shard_count.literal() as i32))
.into_boxed(),
TenantFilter::Tenant(input_tenant_id) => diesel::update(tenant_shards)
.filter(tenant_id.eq(input_tenant_id.to_string()))
.into_boxed(),
};
#[derive(AsChangeset)]
#[diesel(table_name = crate::schema::tenant_shards)]
struct ShardUpdate {
generation: Option<i32>,
placement_policy: Option<String>,
config: Option<String>,
scheduling_policy: Option<String>,
}
let update = ShardUpdate {
generation: input_generation.map(|g| g.into().unwrap() as i32),
placement_policy: input_placement_policy
.as_ref()
.map(|p| serde_json::to_string(&p).unwrap()),
config: input_config
.as_ref()
.map(|c| serde_json::to_string(&c).unwrap()),
scheduling_policy: input_scheduling_policy
.map(|p| serde_json::to_string(&p).unwrap()),
};
query.set(update).execute(conn)?;
Ok(())
})
.await?;
Ok(())
}
pub(crate) async fn detach(&self, tenant_shard_id: TenantShardId) -> anyhow::Result<()> {
use crate::schema::tenant_shards::dsl::*;
self.with_measured_conn(DatabaseOperation::Detach, move |conn| {
let updated = diesel::update(tenant_shards)
.filter(tenant_id.eq(tenant_shard_id.tenant_id.to_string()))
.filter(shard_number.eq(tenant_shard_id.shard_number.0 as i32))
.filter(shard_count.eq(tenant_shard_id.shard_count.literal() as i32))
.set((
generation_pageserver.eq(Option::<i64>::None),
placement_policy.eq(serde_json::to_string(&PlacementPolicy::Detached).unwrap()),
))
.execute(conn)?;
Ok(updated)
})
.await?;
Ok(())
}
// When we start shard splitting, we must durably mark the tenant so that
// on restart, we know that we must go through recovery.
//
// We create the child shards here, so that they will be available for increment_generation calls
// if some pageserver holding a child shard needs to restart before the overall tenant split is complete.
pub(crate) async fn begin_shard_split(
&self,
old_shard_count: ShardCount,
split_tenant_id: TenantId,
parent_to_children: Vec<(TenantShardId, Vec<TenantShardPersistence>)>,
) -> DatabaseResult<()> {
use crate::schema::tenant_shards::dsl::*;
self.with_measured_conn(DatabaseOperation::BeginShardSplit, move |conn| -> DatabaseResult<()> {
// Mark parent shards as splitting
let updated = diesel::update(tenant_shards)
.filter(tenant_id.eq(split_tenant_id.to_string()))
.filter(shard_count.eq(old_shard_count.literal() as i32))
.set((splitting.eq(1),))
.execute(conn)?;
if u8::try_from(updated)
.map_err(|_| DatabaseError::Logical(
format!("Overflow existing shard count {} while splitting", updated))
)? != old_shard_count.count() {
// Perhaps a deletion or another split raced with this attempt to split, mutating
// the parent shards that we intend to split. In this case the split request should fail.
return Err(DatabaseError::Logical(
format!("Unexpected existing shard count {updated} when preparing tenant for split (expected {})", old_shard_count.count())
));
}
// FIXME: spurious clone to sidestep closure move rules
let parent_to_children = parent_to_children.clone();
// Insert child shards
for (parent_shard_id, children) in parent_to_children {
let mut parent = crate::schema::tenant_shards::table
.filter(tenant_id.eq(parent_shard_id.tenant_id.to_string()))
.filter(shard_number.eq(parent_shard_id.shard_number.0 as i32))
.filter(shard_count.eq(parent_shard_id.shard_count.literal() as i32))
.load::<TenantShardPersistence>(conn)?;
let parent = if parent.len() != 1 {
return Err(DatabaseError::Logical(format!(
"Parent shard {parent_shard_id} not found"
)));
} else {
parent.pop().unwrap()
};
for mut shard in children {
// Carry the parent's generation into the child
shard.generation = parent.generation;
debug_assert!(shard.splitting == SplitState::Splitting);
diesel::insert_into(tenant_shards)
.values(shard)
.execute(conn)?;
}
}
Ok(())
})
.await
}
// When we finish shard splitting, we must atomically clean up the old shards
// and insert the new shards, and clear the splitting marker.
pub(crate) async fn complete_shard_split(
&self,
split_tenant_id: TenantId,
old_shard_count: ShardCount,
) -> DatabaseResult<()> {
use crate::schema::tenant_shards::dsl::*;
self.with_measured_conn(
DatabaseOperation::CompleteShardSplit,
move |conn| -> DatabaseResult<()> {
// Drop parent shards
diesel::delete(tenant_shards)
.filter(tenant_id.eq(split_tenant_id.to_string()))
.filter(shard_count.eq(old_shard_count.literal() as i32))
.execute(conn)?;
// Clear sharding flag
let updated = diesel::update(tenant_shards)
.filter(tenant_id.eq(split_tenant_id.to_string()))
.set((splitting.eq(0),))
.execute(conn)?;
debug_assert!(updated > 0);
Ok(())
},
)
.await
}
/// Used when the remote part of a shard split failed: we will revert the database state to have only
/// the parent shards, with SplitState::Idle.
pub(crate) async fn abort_shard_split(
&self,
split_tenant_id: TenantId,
new_shard_count: ShardCount,
) -> DatabaseResult<AbortShardSplitStatus> {
use crate::schema::tenant_shards::dsl::*;
self.with_measured_conn(
DatabaseOperation::AbortShardSplit,
move |conn| -> DatabaseResult<AbortShardSplitStatus> {
// Clear the splitting state on parent shards
let updated = diesel::update(tenant_shards)
.filter(tenant_id.eq(split_tenant_id.to_string()))
.filter(shard_count.ne(new_shard_count.literal() as i32))
.set((splitting.eq(0),))
.execute(conn)?;
// Parent shards are already gone: we cannot abort.
if updated == 0 {
return Ok(AbortShardSplitStatus::Complete);
}
// Sanity check: if parent shards were present, their cardinality should
// be less than the number of child shards.
if updated >= new_shard_count.count() as usize {
return Err(DatabaseError::Logical(format!(
"Unexpected parent shard count {updated} while aborting split to \
count {new_shard_count:?} on tenant {split_tenant_id}"
)));
}
// Erase child shards
diesel::delete(tenant_shards)
.filter(tenant_id.eq(split_tenant_id.to_string()))
.filter(shard_count.eq(new_shard_count.literal() as i32))
.execute(conn)?;
Ok(AbortShardSplitStatus::Aborted)
},
)
.await
}
/// Stores all the latest metadata health updates durably. Updates existing entry on conflict.
///
/// **Correctness:** `metadata_health_updates` should all belong the tenant shards managed by the storage controller.
#[allow(dead_code)]
pub(crate) async fn update_metadata_health_records(
&self,
healthy_records: Vec<MetadataHealthPersistence>,
unhealthy_records: Vec<MetadataHealthPersistence>,
now: chrono::DateTime<chrono::Utc>,
) -> DatabaseResult<()> {
use crate::schema::metadata_health::dsl::*;
self.with_measured_conn(
DatabaseOperation::UpdateMetadataHealth,
move |conn| -> DatabaseResult<_> {
diesel::insert_into(metadata_health)
.values(&healthy_records)
.on_conflict((tenant_id, shard_number, shard_count))
.do_update()
.set((healthy.eq(true), last_scrubbed_at.eq(now)))
.execute(conn)?;
diesel::insert_into(metadata_health)
.values(&unhealthy_records)
.on_conflict((tenant_id, shard_number, shard_count))
.do_update()
.set((healthy.eq(false), last_scrubbed_at.eq(now)))
.execute(conn)?;
Ok(())
},
)
.await
}
/// Lists all the metadata health records.
#[allow(dead_code)]
pub(crate) async fn list_metadata_health_records(
&self,
) -> DatabaseResult<Vec<MetadataHealthPersistence>> {
self.with_measured_conn(
DatabaseOperation::ListMetadataHealth,
move |conn| -> DatabaseResult<_> {
Ok(
crate::schema::metadata_health::table
.load::<MetadataHealthPersistence>(conn)?,
)
},
)
.await
}
/// Lists all the metadata health records that is unhealthy.
#[allow(dead_code)]
pub(crate) async fn list_unhealthy_metadata_health_records(
&self,
) -> DatabaseResult<Vec<MetadataHealthPersistence>> {
use crate::schema::metadata_health::dsl::*;
self.with_measured_conn(
DatabaseOperation::ListMetadataHealthUnhealthy,
move |conn| -> DatabaseResult<_> {
Ok(crate::schema::metadata_health::table
.filter(healthy.eq(false))
.load::<MetadataHealthPersistence>(conn)?)
},
)
.await
}
/// Lists all the metadata health records that have not been updated since an `earlier` time.
#[allow(dead_code)]
pub(crate) async fn list_outdated_metadata_health_records(
&self,
earlier: chrono::DateTime<chrono::Utc>,
) -> DatabaseResult<Vec<MetadataHealthPersistence>> {
use crate::schema::metadata_health::dsl::*;
self.with_measured_conn(
DatabaseOperation::ListMetadataHealthOutdated,
move |conn| -> DatabaseResult<_> {
let query = metadata_health.filter(last_scrubbed_at.lt(earlier));
let res = query.load::<MetadataHealthPersistence>(conn)?;
Ok(res)
},
)
.await
}
/// Get the current entry from the `leader` table if one exists.
/// It is an error for the table to contain more than one entry.
pub(crate) async fn get_leader(&self) -> DatabaseResult<Option<ControllerPersistence>> {
let mut leader: Vec<ControllerPersistence> = self
.with_measured_conn(
DatabaseOperation::GetLeader,
move |conn| -> DatabaseResult<_> {
Ok(crate::schema::controllers::table.load::<ControllerPersistence>(conn)?)
},
)
.await?;
if leader.len() > 1 {
return Err(DatabaseError::Logical(format!(
"More than one entry present in the leader table: {leader:?}"
)));
}
Ok(leader.pop())
}
/// Update the new leader with compare-exchange semantics. If `prev` does not
/// match the current leader entry, then the update is treated as a failure.
/// When `prev` is not specified, the update is forced.
pub(crate) async fn update_leader(
&self,
prev: Option<ControllerPersistence>,
new: ControllerPersistence,
) -> DatabaseResult<()> {
use crate::schema::controllers::dsl::*;
let updated = self
.with_measured_conn(
DatabaseOperation::UpdateLeader,
move |conn| -> DatabaseResult<usize> {
let updated = match &prev {
Some(prev) => diesel::update(controllers)
.filter(address.eq(prev.address.clone()))
.filter(started_at.eq(prev.started_at))
.set((
address.eq(new.address.clone()),
started_at.eq(new.started_at),
))
.execute(conn)?,
None => diesel::insert_into(controllers)
.values(new.clone())
.execute(conn)?,
};
Ok(updated)
},
)
.await?;
if updated == 0 {
return Err(DatabaseError::Logical(
"Leader table update failed".to_string(),
));
}
Ok(())
}
}
/// Parts of [`crate::tenant_shard::TenantShard`] that are stored durably
#[derive(Queryable, Selectable, Insertable, Serialize, Deserialize, Clone, Eq, PartialEq)]
#[diesel(table_name = crate::schema::tenant_shards)]
pub(crate) struct TenantShardPersistence {
#[serde(default)]
pub(crate) tenant_id: String,
#[serde(default)]
pub(crate) shard_number: i32,
#[serde(default)]
pub(crate) shard_count: i32,
#[serde(default)]
pub(crate) shard_stripe_size: i32,
// Latest generation number: next time we attach, increment this
// and use the incremented number when attaching.
//
// Generation is only None when first onboarding a tenant, where it may
// be in PlacementPolicy::Secondary and therefore have no valid generation state.
pub(crate) generation: Option<i32>,
// Currently attached pageserver
#[serde(rename = "pageserver")]
pub(crate) generation_pageserver: Option<i64>,
#[serde(default)]
pub(crate) placement_policy: String,
#[serde(default)]
pub(crate) splitting: SplitState,
#[serde(default)]
pub(crate) config: String,
#[serde(default)]
pub(crate) scheduling_policy: String,
}
impl TenantShardPersistence {
pub(crate) fn get_shard_identity(&self) -> Result<ShardIdentity, ShardConfigError> {
if self.shard_count == 0 {
Ok(ShardIdentity::unsharded())
} else {
Ok(ShardIdentity::new(
ShardNumber(self.shard_number as u8),
ShardCount::new(self.shard_count as u8),
ShardStripeSize(self.shard_stripe_size as u32),
)?)
}
}
pub(crate) fn get_tenant_shard_id(&self) -> Result<TenantShardId, hex::FromHexError> {
Ok(TenantShardId {
tenant_id: TenantId::from_str(self.tenant_id.as_str())?,
shard_number: ShardNumber(self.shard_number as u8),
shard_count: ShardCount::new(self.shard_count as u8),
})
}
}
/// Parts of [`crate::node::Node`] that are stored durably
#[derive(Serialize, Deserialize, Queryable, Selectable, Insertable, Eq, PartialEq)]
#[diesel(table_name = crate::schema::nodes)]
pub(crate) struct NodePersistence {
pub(crate) node_id: i64,
pub(crate) scheduling_policy: String,
pub(crate) listen_http_addr: String,
pub(crate) listen_http_port: i32,
pub(crate) listen_pg_addr: String,
pub(crate) listen_pg_port: i32,
pub(crate) availability_zone_id: Option<String>,
}
/// Tenant metadata health status that are stored durably.
#[derive(Queryable, Selectable, Insertable, Serialize, Deserialize, Clone, Eq, PartialEq)]
#[diesel(table_name = crate::schema::metadata_health)]
pub(crate) struct MetadataHealthPersistence {
#[serde(default)]
pub(crate) tenant_id: String,
#[serde(default)]
pub(crate) shard_number: i32,
#[serde(default)]
pub(crate) shard_count: i32,
pub(crate) healthy: bool,
pub(crate) last_scrubbed_at: chrono::DateTime<chrono::Utc>,
}
impl MetadataHealthPersistence {
pub fn new(
tenant_shard_id: TenantShardId,
healthy: bool,
last_scrubbed_at: chrono::DateTime<chrono::Utc>,
) -> Self {
let tenant_id = tenant_shard_id.tenant_id.to_string();
let shard_number = tenant_shard_id.shard_number.0 as i32;
let shard_count = tenant_shard_id.shard_count.literal() as i32;
MetadataHealthPersistence {
tenant_id,
shard_number,
shard_count,
healthy,
last_scrubbed_at,
}
}
#[allow(dead_code)]
pub(crate) fn get_tenant_shard_id(&self) -> Result<TenantShardId, hex::FromHexError> {
Ok(TenantShardId {
tenant_id: TenantId::from_str(self.tenant_id.as_str())?,
shard_number: ShardNumber(self.shard_number as u8),
shard_count: ShardCount::new(self.shard_count as u8),
})
}
}
impl From<MetadataHealthPersistence> for MetadataHealthRecord {
fn from(value: MetadataHealthPersistence) -> Self {
MetadataHealthRecord {
tenant_shard_id: value
.get_tenant_shard_id()
.expect("stored tenant id should be valid"),
healthy: value.healthy,
last_scrubbed_at: value.last_scrubbed_at,
}
}
}
#[derive(
Serialize, Deserialize, Queryable, Selectable, Insertable, Eq, PartialEq, Debug, Clone,
)]
#[diesel(table_name = crate::schema::controllers)]
pub(crate) struct ControllerPersistence {
pub(crate) address: String,
pub(crate) started_at: chrono::DateTime<chrono::Utc>,
}
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