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// Copyright Materialize, Inc. and contributors. All rights reserved.
//
// Use of this software is governed by the Business Source License
// included in the LICENSE file.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0.
//! A controller that provides an interface to the storage layer.
//!
//! The storage controller curates the creation of sources, the progress of readers through these collections,
//! and their eventual dropping and resource reclamation.
//!
//! The storage controller can be viewed as a partial map from `GlobalId` to collection. It is an error to
//! use an identifier before it has been "created" with `create_source()`. Once created, the controller holds
//! a read capability for each source, which is manipulated with `update_read_capabilities()`.
//! Eventually, the source is dropped with either `drop_sources()` or by allowing compaction to the
//! empty frontier.
use std::collections::{BTreeMap, BTreeSet};
use std::fmt::Debug;
use std::future::Future;
use std::num::NonZeroI64;
use std::pin::Pin;
use std::sync::Arc;
use std::time::Duration;
use async_trait::async_trait;
use differential_dataflow::lattice::Lattice;
use mz_cluster_client::client::ClusterReplicaLocation;
use mz_cluster_client::metrics::WallclockLagMetrics;
use mz_cluster_client::ReplicaId;
use mz_ore::collections::CollectionExt;
use mz_persist_client::read::{Cursor, ReadHandle};
use mz_persist_client::stats::{SnapshotPartsStats, SnapshotStats};
use mz_persist_types::schema::SchemaId;
use mz_persist_types::{Codec64, Opaque, ShardId};
use mz_repr::{Diff, GlobalId, RelationDesc, Row};
use mz_storage_types::configuration::StorageConfiguration;
use mz_storage_types::connections::inline::InlinedConnection;
use mz_storage_types::controller::{CollectionMetadata, StorageError};
use mz_storage_types::instances::StorageInstanceId;
use mz_storage_types::parameters::StorageParameters;
use mz_storage_types::read_holds::{ReadHold, ReadHoldError};
use mz_storage_types::read_policy::ReadPolicy;
use mz_storage_types::sinks::{MetadataUnfilled, StorageSinkConnection, StorageSinkDesc};
use mz_storage_types::sources::{
GenericSourceConnection, IngestionDescription, SourceData, SourceDesc, SourceExportDataConfig,
SourceExportDetails, Timeline,
};
use serde::{Deserialize, Serialize};
use timely::progress::Timestamp as TimelyTimestamp;
use timely::progress::{Antichain, Timestamp};
use tokio::sync::{mpsc, oneshot};
use crate::client::{AppendOnlyUpdate, StatusUpdate, TimestamplessUpdate};
use crate::statistics::WebhookStatistics;
#[derive(Clone, Copy, Debug, Serialize, Deserialize, Eq, PartialEq, Hash, PartialOrd, Ord)]
pub enum IntrospectionType {
/// We're not responsible for appending to this collection automatically, but we should
/// automatically bump the write frontier from time to time.
SinkStatusHistory,
SourceStatusHistory,
ShardMapping,
Frontiers,
ReplicaFrontiers,
ReplicaStatusHistory,
ReplicaMetricsHistory,
WallclockLagHistory,
// Note that this single-shard introspection source will be changed to per-replica,
// once we allow multiplexing multiple sources/sinks on a single cluster.
StorageSourceStatistics,
StorageSinkStatistics,
// The below are for statement logging.
StatementExecutionHistory,
SessionHistory,
PreparedStatementHistory,
SqlText,
// For statement lifecycle logging, which is closely related
// to statement logging
StatementLifecycleHistory,
// Collections written by the compute controller.
ComputeDependencies,
ComputeOperatorHydrationStatus,
ComputeMaterializedViewRefreshes,
ComputeErrorCounts,
ComputeHydrationTimes,
// Written by the Adapter for tracking AWS PrivateLink Connection Status History
PrivatelinkConnectionStatusHistory,
}
/// Describes how data is written to the collection.
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum DataSource {
/// Ingest data from some external source.
Ingestion(IngestionDescription),
/// This source receives its data from the identified ingestion,
/// from an external object identified using `SourceExportDetails`.
///
/// The referenced ingestion must be created before all of its exports.
IngestionExport {
ingestion_id: GlobalId,
details: SourceExportDetails,
data_config: SourceExportDataConfig,
},
/// Data comes from introspection sources, which the controller itself is
/// responsible for generating.
Introspection(IntrospectionType),
/// Data comes from the source's remapping/reclock operator.
Progress,
/// Data comes from external HTTP requests pushed to Materialize.
Webhook,
/// The adapter layer appends timestamped data, i.e. it is a `TABLE`.
Table,
/// This source's data is does not need to be managed by the storage
/// controller, e.g. it's a materialized view or the catalog collection.
Other,
}
/// Describes a request to create a source.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct CollectionDescription<T> {
/// The schema of this collection
pub desc: RelationDesc,
/// The source of this collection's data.
pub data_source: DataSource,
/// An optional frontier to which the collection's `since` should be advanced.
pub since: Option<Antichain<T>>,
/// A GlobalId to use for this collection to use for the status collection.
/// Used to keep track of source status/error information.
pub status_collection_id: Option<GlobalId>,
/// The timeline of the source. Absent for materialized views, continual tasks, etc.
pub timeline: Option<Timeline>,
}
impl<T> CollectionDescription<T> {
pub fn for_table(desc: RelationDesc) -> Self {
Self {
desc,
data_source: DataSource::Table,
since: None,
status_collection_id: None,
timeline: Some(Timeline::EpochMilliseconds),
}
}
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct ExportDescription<T = mz_repr::Timestamp> {
pub sink: StorageSinkDesc<MetadataUnfilled, T>,
/// The ID of the instance in which to install the export.
pub instance_id: StorageInstanceId,
}
/// A cursor over a snapshot, allowing us to read just part of a snapshot in its
/// consolidated form.
pub struct SnapshotCursor<T: Codec64 + Timestamp + Lattice> {
// We allocate a temporary read handle for each snapshot, and that handle needs to live at
// least as long as the cursor itself, which holds part leases. Bundling them together!
pub _read_handle: ReadHandle<SourceData, (), T, Diff>,
pub cursor: Cursor<SourceData, (), T, Diff>,
}
impl<T: Codec64 + Timestamp + Lattice + Sync> SnapshotCursor<T> {
pub async fn next(
&mut self,
) -> Option<
impl Iterator<Item = ((Result<SourceData, String>, Result<(), String>), T, Diff)> + Sized + '_,
> {
self.cursor.next().await
}
}
#[derive(Debug)]
pub enum Response<T> {
FrontierUpdates(Vec<(GlobalId, Antichain<T>)>),
}
/// Metadata that the storage controller must know to properly handle the life
/// cycle of creating and dropping collections.j
///
/// This data should be kept consistent with the state modified using
/// [`StorageTxn`].
///
/// n.b. the "txn WAL shard" is also metadata that's persisted, but if we
/// included it in this struct it would never be read.
#[derive(Debug, Clone, Serialize, Default)]
pub struct StorageMetadata {
#[serde(serialize_with = "mz_ore::serde::map_key_to_string")]
pub collection_metadata: BTreeMap<GlobalId, ShardId>,
pub unfinalized_shards: BTreeSet<ShardId>,
}
impl StorageMetadata {
pub fn get_collection_shard<T>(&self, id: GlobalId) -> Result<ShardId, StorageError<T>> {
let shard_id = self
.collection_metadata
.get(&id)
.ok_or(StorageError::IdentifierMissing(id))?;
Ok(*shard_id)
}
}
/// Provides an interface for the storage controller to read and write data that
/// is recorded elsewhere.
///
/// Data written to the implementor of this trait should make a consistent view
/// of the data available through [`StorageMetadata`].
#[async_trait]
pub trait StorageTxn<T> {
/// Retrieve all of the visible storage metadata.
///
/// The value of this map should be treated as opaque.
fn get_collection_metadata(&self) -> BTreeMap<GlobalId, ShardId>;
/// Add new storage metadata for a collection.
///
/// Subsequent calls to [`StorageTxn::get_collection_metadata`] must include
/// this data.
fn insert_collection_metadata(
&mut self,
s: BTreeMap<GlobalId, ShardId>,
) -> Result<(), StorageError<T>>;
/// Remove the metadata associated with the identified collections.
///
/// Subsequent calls to [`StorageTxn::get_collection_metadata`] must not
/// include these keys.
fn delete_collection_metadata(&mut self, ids: BTreeSet<GlobalId>) -> Vec<(GlobalId, ShardId)>;
/// Retrieve all of the shards that are no longer in use by an active
/// collection but are yet to be finalized.
fn get_unfinalized_shards(&self) -> BTreeSet<ShardId>;
/// Insert the specified values as unfinalized shards.
fn insert_unfinalized_shards(&mut self, s: BTreeSet<ShardId>) -> Result<(), StorageError<T>>;
/// Mark the specified shards as finalized, deleting them from the
/// unfinalized shard collection.
fn mark_shards_as_finalized(&mut self, shards: BTreeSet<ShardId>);
/// Get the txn WAL shard for this environment if it exists.
fn get_txn_wal_shard(&self) -> Option<ShardId>;
/// Store the specified shard as the environment's txn WAL shard.
///
/// The implementor should error if the shard is already specified.
fn write_txn_wal_shard(&mut self, shard: ShardId) -> Result<(), StorageError<T>>;
}
pub type BoxFuture<T> = Pin<Box<dyn Future<Output = T> + Send + 'static>>;
/// A predicate for a `Row` filter.
pub type RowPredicate = Box<dyn Fn(&Row) -> bool + Send + Sync>;
/// High-level write operations applicable to storage collections.
pub enum StorageWriteOp {
/// Append a set of rows with specified multiplicities.
///
/// The multiplicities may be negative, so an `Append` operation can perform
/// both insertions and retractions.
Append { updates: Vec<(Row, Diff)> },
/// Delete all rows matching the given predicate.
Delete { filter: RowPredicate },
}
impl StorageWriteOp {
/// Returns whether this operation appends an empty set of updates.
pub fn is_empty_append(&self) -> bool {
match self {
Self::Append { updates } => updates.is_empty(),
Self::Delete { .. } => false,
}
}
}
#[async_trait(?Send)]
pub trait StorageController: Debug {
type Timestamp: TimelyTimestamp;
/// Marks the end of any initialization commands.
///
/// The implementor may wait for this method to be called before implementing prior commands,
/// and so it is important for a user to invoke this method as soon as it is comfortable.
/// This method can be invoked immediately, at the potential expense of performance.
fn initialization_complete(&mut self);
/// Update storage configuration with new parameters.
fn update_parameters(&mut self, config_params: StorageParameters);
/// Get the current configuration, including parameters updated with `update_parameters`.
fn config(&self) -> &StorageConfiguration;
/// Returns the [CollectionMetadata] of the collection identified by `id`.
fn collection_metadata(
&self,
id: GlobalId,
) -> Result<CollectionMetadata, StorageError<Self::Timestamp>>;
/// Returns `true` iff the given collection/ingestion has been hydrated.
///
/// For this check, zero-replica clusters are always considered hydrated.
/// Their collections would never normally be considered hydrated but it's
/// clearly intentional that they have no replicas.
fn collection_hydrated(
&self,
collection_id: GlobalId,
) -> Result<bool, StorageError<Self::Timestamp>>;
/// Returns the since/upper frontiers of the identified collection.
fn collection_frontiers(
&self,
id: GlobalId,
) -> Result<
(Antichain<Self::Timestamp>, Antichain<Self::Timestamp>),
StorageError<Self::Timestamp>,
>;
/// Returns the since/upper frontiers of the identified collections.
///
/// Having a method that returns both frontiers at the same time, for all
/// requested collections, ensures that we can get a consistent "snapshot"
/// of collection state. If we had separate methods instead, and/or would
/// allow getting frontiers for collections one at a time, it could happen
/// that collection state changes concurrently, while information is
/// gathered.
fn collections_frontiers(
&self,
id: Vec<GlobalId>,
) -> Result<
Vec<(
GlobalId,
Antichain<Self::Timestamp>,
Antichain<Self::Timestamp>,
)>,
StorageError<Self::Timestamp>,
>;
/// Acquire an iterator over [CollectionMetadata] for all active
/// collections.
///
/// A collection is "active" when it has a non empty frontier of read
/// capabilties.
fn active_collection_metadatas(&self) -> Vec<(GlobalId, CollectionMetadata)>;
/// Returns the IDs of all active ingestions for the given storage instance.
fn active_ingestions(&self, instance_id: StorageInstanceId) -> &BTreeSet<GlobalId>;
/// Checks whether a collection exists under the given `GlobalId`. Returns
/// an error if the collection does not exist.
fn check_exists(&self, id: GlobalId) -> Result<(), StorageError<Self::Timestamp>>;
/// Creates a storage instance with the specified ID.
///
/// A storage instance can have zero or one replicas. The instance is
/// created with zero replicas.
///
/// Panics if a storage instance with the given ID already exists.
fn create_instance(&mut self, id: StorageInstanceId);
/// Drops the storage instance with the given ID.
///
/// If you call this method while the storage instance has a replica
/// attached, that replica will be leaked. Call `drop_replica` first.
///
/// Panics if a storage instance with the given ID does not exist.
fn drop_instance(&mut self, id: StorageInstanceId);
/// Connects the storage instance to the specified replica.
///
/// If the storage instance is already attached to a replica, communication
/// with that replica is severed in favor of the new replica.
///
/// In the future, this API will be adjusted to support active replication
/// of storage instances (i.e., multiple replicas attached to a given
/// storage instance).
fn connect_replica(
&mut self,
instance_id: StorageInstanceId,
replica_id: ReplicaId,
location: ClusterReplicaLocation,
);
/// Disconnects the storage instance from the specified replica.
fn drop_replica(&mut self, instance_id: StorageInstanceId, replica_id: ReplicaId);
/// Create the sources described in the individual RunIngestionCommand commands.
///
/// Each command carries the source id, the source description, and any associated metadata
/// needed to ingest the particular source.
///
/// This command installs collection state for the indicated sources, and they are
/// now valid to use in queries at times beyond the initial `since` frontiers. Each
/// collection also acquires a read capability at this frontier, which will need to
/// be repeatedly downgraded with `allow_compaction()` to permit compaction.
///
/// This method is NOT idempotent; It can fail between processing of different
/// collections and leave the controller in an inconsistent state. It is almost
/// always wrong to do anything but abort the process on `Err`.
///
/// The `register_ts` is used as the initial timestamp that tables are available for reads. (We
/// might later give non-tables the same treatment, but hold off on that initially.) Callers
/// must provide a Some if any of the collections is a table. A None may be given if none of the
/// collections are a table (i.e. all materialized views, sources, etc).
async fn create_collections(
&mut self,
storage_metadata: &StorageMetadata,
register_ts: Option<Self::Timestamp>,
collections: Vec<(GlobalId, CollectionDescription<Self::Timestamp>)>,
) -> Result<(), StorageError<Self::Timestamp>> {
self.create_collections_for_bootstrap(
storage_metadata,
register_ts,
collections,
&BTreeSet::new(),
)
.await
}
/// Like [`Self::create_collections`], except used specifically for bootstrap.
///
/// `migrated_storage_collections` is a set of migrated storage collections to be excluded
/// from the txn-wal sub-system.
async fn create_collections_for_bootstrap(
&mut self,
storage_metadata: &StorageMetadata,
register_ts: Option<Self::Timestamp>,
collections: Vec<(GlobalId, CollectionDescription<Self::Timestamp>)>,
migrated_storage_collections: &BTreeSet<GlobalId>,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Check that the ingestion associated with `id` can use the provided
/// [`SourceDesc`].
///
/// Note that this check is optimistic and its return of `Ok(())` does not
/// guarantee that subsequent calls to `alter_ingestion_source_desc` are
/// guaranteed to succeed.
fn check_alter_ingestion_source_desc(
&mut self,
ingestion_id: GlobalId,
source_desc: &SourceDesc,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Alters the identified collection to use the provided [`SourceDesc`].
async fn alter_ingestion_source_desc(
&mut self,
ingestion_id: GlobalId,
source_desc: SourceDesc,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Alters each identified collection to use the correlated [`GenericSourceConnection`].
async fn alter_ingestion_connections(
&mut self,
source_connections: BTreeMap<GlobalId, GenericSourceConnection<InlinedConnection>>,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Alters the data config for the specified source exports of the specified ingestions.
async fn alter_ingestion_export_data_configs(
&mut self,
source_exports: BTreeMap<GlobalId, SourceExportDataConfig>,
) -> Result<(), StorageError<Self::Timestamp>>;
async fn alter_table_desc(
&mut self,
table_id: GlobalId,
new_desc: RelationDesc,
expected_schema: SchemaId,
forget_ts: Self::Timestamp,
register_ts: Self::Timestamp,
) -> Result<SchemaId, StorageError<Self::Timestamp>>;
/// Acquire an immutable reference to the export state, should it exist.
fn export(
&self,
id: GlobalId,
) -> Result<&ExportState<Self::Timestamp>, StorageError<Self::Timestamp>>;
/// Acquire a mutable reference to the export state, should it exist.
fn export_mut(
&mut self,
id: GlobalId,
) -> Result<&mut ExportState<Self::Timestamp>, StorageError<Self::Timestamp>>;
/// Create the sinks described by the `ExportDescription`.
async fn create_exports(
&mut self,
exports: Vec<(GlobalId, ExportDescription<Self::Timestamp>)>,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Alter the sink identified by the given id to match the provided `ExportDescription`.
async fn alter_export(
&mut self,
id: GlobalId,
export: ExportDescription<Self::Timestamp>,
) -> Result<(), StorageError<Self::Timestamp>>;
/// For each identified export, alter its [`StorageSinkConnection`].
async fn alter_export_connections(
&mut self,
exports: BTreeMap<GlobalId, StorageSinkConnection>,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Drops the read capability for the tables and allows their resources to be reclaimed.
fn drop_tables(
&mut self,
storage_metadata: &StorageMetadata,
identifiers: Vec<GlobalId>,
ts: Self::Timestamp,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Drops the read capability for the sources and allows their resources to be reclaimed.
fn drop_sources(
&mut self,
storage_metadata: &StorageMetadata,
identifiers: Vec<GlobalId>,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Drops the read capability for the sinks and allows their resources to be reclaimed.
fn drop_sinks(
&mut self,
identifiers: Vec<GlobalId>,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Drops the read capability for the sinks and allows their resources to be reclaimed.
///
/// TODO(jkosh44): This method does not validate the provided identifiers. Currently when the
/// controller starts/restarts it has no durable state. That means that it has no way of
/// remembering any past commands sent. In the future we plan on persisting state for the
/// controller so that it is aware of past commands.
/// Therefore this method is for dropping sinks that we know to have been previously
/// created, but have been forgotten by the controller due to a restart.
/// Once command history becomes durable we can remove this method and use the normal
/// `drop_sinks`.
fn drop_sinks_unvalidated(&mut self, identifiers: Vec<GlobalId>);
/// Drops the read capability for the sources and allows their resources to be reclaimed.
///
/// TODO(jkosh44): This method does not validate the provided identifiers. Currently when the
/// controller starts/restarts it has no durable state. That means that it has no way of
/// remembering any past commands sent. In the future we plan on persisting state for the
/// controller so that it is aware of past commands.
/// Therefore this method is for dropping sources that we know to have been previously
/// created, but have been forgotten by the controller due to a restart.
/// Once command history becomes durable we can remove this method and use the normal
/// `drop_sources`.
fn drop_sources_unvalidated(
&mut self,
storage_metadata: &StorageMetadata,
identifiers: Vec<GlobalId>,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Append `updates` into the local input named `id` and advance its upper to `upper`.
///
/// The method returns a oneshot that can be awaited to indicate completion of the write.
/// The method may return an error, indicating an immediately visible error, and also the
/// oneshot may return an error if one is encountered during the write.
///
/// All updates in `commands` are applied atomically.
// TODO(petrosagg): switch upper to `Antichain<Timestamp>`
fn append_table(
&mut self,
write_ts: Self::Timestamp,
advance_to: Self::Timestamp,
commands: Vec<(GlobalId, Vec<TimestamplessUpdate>)>,
) -> Result<
tokio::sync::oneshot::Receiver<Result<(), StorageError<Self::Timestamp>>>,
StorageError<Self::Timestamp>,
>;
/// Returns a [`MonotonicAppender`] which is a channel that can be used to monotonically
/// append to the specified [`GlobalId`].
fn monotonic_appender(
&self,
id: GlobalId,
) -> Result<MonotonicAppender<Self::Timestamp>, StorageError<Self::Timestamp>>;
/// Returns a shared [`WebhookStatistics`] which can be used to report user-facing
/// statistics for this given webhhook, specified by the [`GlobalId`].
///
// This is used to support a fairly special case, where a source needs to report statistics
// from outside the ordinary controller-clusterd path. Its possible to merge this with
// `monotonic_appender`, whose only current user is webhooks, but given that they will
// likely be moved to clusterd, we just leave this a special case.
fn webhook_statistics(
&self,
id: GlobalId,
) -> Result<Arc<WebhookStatistics>, StorageError<Self::Timestamp>>;
/// Returns the snapshot of the contents of the local input named `id` at `as_of`.
fn snapshot(
&self,
id: GlobalId,
as_of: Self::Timestamp,
) -> BoxFuture<Result<Vec<(Row, Diff)>, StorageError<Self::Timestamp>>>;
/// Returns the snapshot of the contents of the local input named `id` at
/// the largest readable `as_of`.
async fn snapshot_latest(
&self,
id: GlobalId,
) -> Result<Vec<Row>, StorageError<Self::Timestamp>>;
/// Returns the snapshot of the contents of the local input named `id` at `as_of`.
async fn snapshot_cursor(
&mut self,
id: GlobalId,
as_of: Self::Timestamp,
) -> Result<SnapshotCursor<Self::Timestamp>, StorageError<Self::Timestamp>>
where
Self::Timestamp: Codec64 + Timestamp + Lattice;
/// Returns aggregate statistics about the contents of the local input named
/// `id` at `as_of`.
async fn snapshot_stats(
&self,
id: GlobalId,
as_of: Antichain<Self::Timestamp>,
) -> Result<SnapshotStats, StorageError<Self::Timestamp>>;
/// Returns aggregate statistics about the contents of the local input named
/// `id` at `as_of`.
///
/// Note that this async function itself returns a future. We may
/// need to block on the stats being available, but don't want to hold a reference
/// to the controller for too long... so the outer future holds a reference to the
/// controller but returns quickly, and the inner future is slow but does not
/// reference the controller.
async fn snapshot_parts_stats(
&self,
id: GlobalId,
as_of: Antichain<Self::Timestamp>,
) -> BoxFuture<Result<SnapshotPartsStats, StorageError<Self::Timestamp>>>;
/// Assigns a read policy to specific identifiers.
///
/// The policies are assigned in the order presented, and repeated identifiers should
/// conclude with the last policy. Changing a policy will immediately downgrade the read
/// capability if appropriate, but it will not "recover" the read capability if the prior
/// capability is already ahead of it.
///
/// The `StorageController` may include its own overrides on these policies.
///
/// Identifiers not present in `policies` retain their existing read policies.
fn set_read_policy(&mut self, policies: Vec<(GlobalId, ReadPolicy<Self::Timestamp>)>);
/// Acquires and returns the desired read holds, advancing them to the since
/// frontier when necessary.
fn acquire_read_holds(
&self,
desired_holds: Vec<GlobalId>,
) -> Result<Vec<ReadHold<Self::Timestamp>>, ReadHoldError>;
/// Acquires and returns the earliest legal read hold.
fn acquire_read_hold(
&mut self,
id: GlobalId,
) -> Result<ReadHold<Self::Timestamp>, ReadHoldError> {
let hold = self.acquire_read_holds(vec![id])?.into_element();
Ok(hold)
}
/// Waits until the controller is ready to process a response.
///
/// This method may block for an arbitrarily long time.
///
/// When the method returns, the owner should call
/// [`StorageController::process`] to process the ready message.
///
/// This method is cancellation safe.
async fn ready(&mut self);
/// Processes the work queued by [`StorageController::ready`].
fn process(
&mut self,
storage_metadata: &StorageMetadata,
) -> Result<Option<Response<Self::Timestamp>>, anyhow::Error>;
/// Exposes the internal state of the data shard for debugging and QA.
///
/// We'll be thoughtful about making unnecessary changes, but the **output
/// of this method needs to be gated from users**, so that it's not subject
/// to our backward compatibility guarantees.
///
/// TODO: Ideally this would return `impl Serialize` so the caller can do
/// with it what they like, but that doesn't work in traits yet. The
/// workaround (an associated type) doesn't work because persist doesn't
/// want to make the type public. In the meantime, move the `serde_json`
/// call from the single user into this method.
async fn inspect_persist_state(&self, id: GlobalId)
-> Result<serde_json::Value, anyhow::Error>;
/// Records append-only updates for the given introspection type.
///
/// Rows passed in `updates` MUST have the correct schema for the given
/// introspection type, as readers rely on this and might panic otherwise.
fn append_introspection_updates(&mut self, type_: IntrospectionType, updates: Vec<(Row, Diff)>);
/// Records append-only status updates for the given introspection type.
fn append_status_introspection_updates(
&mut self,
type_: IntrospectionType,
updates: Vec<StatusUpdate>,
);
/// Updates the desired state of the given introspection type.
///
/// Rows passed in `op` MUST have the correct schema for the given
/// introspection type, as readers rely on this and might panic otherwise.
fn update_introspection_collection(&mut self, type_: IntrospectionType, op: StorageWriteOp);
/// On boot, seed the controller's metadata/state.
async fn initialize_state(
&mut self,
txn: &mut (dyn StorageTxn<Self::Timestamp> + Send),
init_ids: BTreeSet<GlobalId>,
drop_ids: BTreeSet<GlobalId>,
) -> Result<(), StorageError<Self::Timestamp>>;
/// Update the implementor of [`StorageTxn`] with the appropriate metadata
/// given the IDs to add and drop.
///
/// The data modified in the `StorageTxn` must be made available in all
/// subsequent calls that require [`StorageMetadata`] as a parameter.
async fn prepare_state(
&self,
txn: &mut (dyn StorageTxn<Self::Timestamp> + Send),
ids_to_add: BTreeSet<GlobalId>,
ids_to_drop: BTreeSet<GlobalId>,
) -> Result<(), StorageError<Self::Timestamp>>;
async fn real_time_recent_timestamp(
&self,
source_ids: BTreeSet<GlobalId>,
timeout: Duration,
) -> Result<
BoxFuture<Result<Self::Timestamp, StorageError<Self::Timestamp>>>,
StorageError<Self::Timestamp>,
>;
}
impl DataSource {
/// Returns true if the storage controller manages the data shard for this
/// source using txn-wal.
pub fn in_txns(&self) -> bool {
match self {
DataSource::Table => true,
DataSource::Other
| DataSource::Ingestion(_)
| DataSource::IngestionExport { .. }
| DataSource::Introspection(_)
| DataSource::Progress
| DataSource::Webhook => false,
}
}
}
/// A wrapper struct that presents the adapter token to a format that is understandable by persist
/// and also allows us to differentiate between a token being present versus being set for the
/// first time.
#[derive(PartialEq, Clone, Debug)]
pub struct PersistEpoch(pub Option<NonZeroI64>);
impl Opaque for PersistEpoch {
fn initial() -> Self {
PersistEpoch(None)
}
}
impl Codec64 for PersistEpoch {
fn codec_name() -> String {
"PersistEpoch".to_owned()
}
fn encode(&self) -> [u8; 8] {
self.0.map(NonZeroI64::get).unwrap_or(0).to_le_bytes()
}
fn decode(buf: [u8; 8]) -> Self {
Self(NonZeroI64::new(i64::from_le_bytes(buf)))
}
}
impl From<NonZeroI64> for PersistEpoch {
fn from(epoch: NonZeroI64) -> Self {
Self(Some(epoch))
}
}
/// State maintained about individual exports.
#[derive(Debug)]
pub struct ExportState<T: TimelyTimestamp> {
/// Description with which the export was created
pub description: ExportDescription<T>,
/// The read hold that this export has on its dependencies (inputs). When
/// the upper of the export changes, we downgrade this, which in turn
/// downgrades holds we have on our dependencies' sinces.
pub read_hold: ReadHold<T>,
/// The policy to use to downgrade `self.read_capability`.
pub read_policy: ReadPolicy<T>,
/// Reported write frontier.
pub write_frontier: Antichain<T>,
/// Maximum frontier wallclock lag since the last introspection update.
pub wallclock_lag_max: Duration,
/// Frontier wallclock lag metrics tracked for this collection.
pub wallclock_lag_metrics: WallclockLagMetrics,
}
impl<T: Timestamp> ExportState<T> {
pub fn new(
description: ExportDescription<T>,
read_hold: ReadHold<T>,
read_policy: ReadPolicy<T>,
wallclock_lag_metrics: WallclockLagMetrics,
) -> Self {
Self {
description,
read_hold,
read_policy,
write_frontier: Antichain::from_elem(Timestamp::minimum()),
wallclock_lag_max: Default::default(),
wallclock_lag_metrics,
}
}
/// Returns the cluster to which the export is bound.
pub fn cluster_id(&self) -> StorageInstanceId {
self.description.instance_id
}
/// Returns whether the export was dropped.
pub fn is_dropped(&self) -> bool {
self.read_hold.since().is_empty()
}
}
/// A channel that allows you to append a set of updates to a pre-defined [`GlobalId`].
///
/// See `CollectionManager::monotonic_appender` to acquire a [`MonotonicAppender`].
#[derive(Clone, Debug)]
pub struct MonotonicAppender<T> {
/// Channel that sends to a [`tokio::task`] which pushes updates to Persist.
tx: mpsc::UnboundedSender<(
Vec<AppendOnlyUpdate>,
oneshot::Sender<Result<(), StorageError<T>>>,
)>,
}
impl<T> MonotonicAppender<T> {
pub fn new(
tx: mpsc::UnboundedSender<(
Vec<AppendOnlyUpdate>,
oneshot::Sender<Result<(), StorageError<T>>>,
)>,
) -> Self {
MonotonicAppender { tx }
}
pub async fn append(&self, updates: Vec<AppendOnlyUpdate>) -> Result<(), StorageError<T>> {
let (tx, rx) = oneshot::channel();
// Send our update to the CollectionManager.
self.tx
.send((updates, tx))
.map_err(|_| StorageError::ShuttingDown("collection manager"))?;
// Wait for a response, if we fail to receive then the CollectionManager has gone away.
let result = rx
.await
.map_err(|_| StorageError::ShuttingDown("collection manager"))?;
result
}
}
#[cfg(test)]
mod tests {
use super::*;
#[mz_ore::test]
fn lag_writes_by_zero() {
let policy =
ReadPolicy::lag_writes_by(mz_repr::Timestamp::default(), mz_repr::Timestamp::default());
let write_frontier = Antichain::from_elem(mz_repr::Timestamp::from(5));
assert_eq!(policy.frontier(write_frontier.borrow()), write_frontier);
}
}