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// SPDX-License-Identifier: BUSL-1.1
//! WAL replay for FTS engine startup recovery.
//!
//! Called once during startup, after `open()` but before the event loop.
//! Processes `FtsIndex` and `FtsDelete` records, routing each through the
//! same apply handler (`execute_fts_index_doc` / `execute_fts_delete_doc`)
//! that the live sync path uses so the idempotency gate fires on replay.
//!
//! ## Surrogate re-derivation on replay
//!
//! The WAL payload stores the document key as the hex-encoded surrogate
//! string produced by `surrogate_to_doc_id(surrogate)` (format `{:08x}`).
//! On replay we parse it back via `u32::from_str_radix(&doc_id, 16)` —
//! the same conversion used by the scan / prefilter paths. This does not
//! require a catalog or surrogate-assigner round-trip: the 8-hex-char key
//! is already the stable `u32` surrogate identity.
use crate::bridge::envelope::{PhysicalPlan, Priority, Request};
use crate::data::executor::core_loop::CoreLoop;
use crate::data::executor::task::{ExecutionTask, TaskState};
use crate::types::{DatabaseId, ReadConsistency};
use nodedb_physical::physical_plan::TextOp;
use nodedb_types::Surrogate;
use nodedb_wal::record::RecordType;
impl CoreLoop {
/// Build a synthetic `ExecutionTask` for FTS WAL replay.
fn replay_fts_task(
tenant_id: crate::types::TenantId,
database_id: DatabaseId,
vshard_id: crate::types::VShardId,
plan: PhysicalPlan,
) -> ExecutionTask {
ExecutionTask {
request: Request {
request_id: crate::types::RequestId::new(0),
tenant_id,
database_id,
vshard_id,
plan,
deadline: std::time::Instant::now() + std::time::Duration::from_secs(60),
priority: Priority::Normal,
trace_id: crate::types::TraceId::ZERO,
consistency: ReadConsistency::Strong,
idempotency_key: None,
event_source: crate::event::EventSource::User,
user_roles: Vec::new(),
user_id: None,
statement_digest: None,
txn_id: None,
wal_lsn: None,
resolved_now_ms: None,
admission: crate::bridge::envelope::Admission::Exempt(
crate::bridge::envelope::ExemptReason::AlreadyOrdered,
),
},
state: TaskState::Running,
wal_lsn: None,
resolved_now_ms: None,
}
}
/// Replay WAL FTS records to rebuild in-memory inverted indexes after crash.
///
/// Processes `FtsIndex` and `FtsDelete` records in LSN order. Each record
/// is decoded and routed through the apply handler so the idempotency gate
/// runs on replay exactly as it does on the live ingest path.
pub fn replay_fts_wal(
&mut self,
records: &[nodedb_wal::WalRecord],
num_cores: usize,
tombstones: &nodedb_wal::TombstoneSet,
) {
use nodedb_wal::record::{FtsDeletePayload, FtsIndexPayload};
let mut indexed = 0usize;
let mut deleted = 0usize;
let mut skipped = 0usize;
for record in records {
let logical_type = record.logical_record_type();
let record_type = RecordType::from_raw(logical_type);
let is_fts_index = record_type == Some(RecordType::FtsIndex);
let is_fts_delete = record_type == Some(RecordType::FtsDelete);
if !is_fts_index && !is_fts_delete {
continue;
}
let vshard_id = record.header.vshard_id as usize;
let target_core = if num_cores > 0 {
vshard_id % num_cores
} else {
0
};
if target_core != self.core_id {
skipped += 1;
continue;
}
let tenant_id = record.header.tenant_id;
let record_lsn = record.header.lsn;
// Replayed writes land under the database recorded in the WAL header.
// Pre-scoping records carry `database_id == 0`, which maps to
// `DatabaseId::DEFAULT` — exactly where the migration placed legacy
// rows, so old and replayed data co-locate correctly.
let database_id = DatabaseId::new(record.header.database_id);
if is_fts_index {
let payload = match FtsIndexPayload::from_bytes(&record.payload) {
Ok(p) => p,
Err(e) => {
tracing::warn!(
core = self.core_id,
lsn = record_lsn,
error = %e,
"WAL FTS replay: failed to decode FtsIndexPayload; skipping"
);
skipped += 1;
continue;
}
};
if tombstones.is_tombstoned(
database_id.as_u64(),
tenant_id,
&payload.collection,
record_lsn,
) {
skipped += 1;
continue;
}
// Re-derive surrogate from the hex doc_id stored in the WAL.
let surrogate = match u32::from_str_radix(&payload.doc_id, 16) {
Ok(raw) => Surrogate::new(raw),
Err(_) => {
tracing::warn!(
core = self.core_id,
lsn = record_lsn,
doc_id = %payload.doc_id,
"WAL FTS replay: doc_id is not a valid hex surrogate; skipping"
);
skipped += 1;
continue;
}
};
let prov = payload.provenance.clone();
let vshard = crate::types::VShardId::from_collection_in_database(
database_id,
&payload.collection,
);
let task = Self::replay_fts_task(
nodedb_types::TenantId::new(tenant_id),
database_id,
vshard,
PhysicalPlan::Text(TextOp::FtsIndexDoc {
collection: payload.collection.clone(),
surrogate,
text: payload.text.clone(),
provenance: Some(prov.clone()),
}),
);
let response = self.execute_fts_index_doc(
&task,
tenant_id,
&payload.collection,
surrogate,
&payload.text,
Some(&prov),
);
if response.status != crate::bridge::envelope::Status::Ok {
tracing::warn!(
core = self.core_id,
collection = %payload.collection,
lsn = record_lsn,
"WAL FTS replay: FtsIndex handler returned error; skipping"
);
skipped += 1;
continue;
}
indexed += 1;
} else {
// FtsDelete
let payload = match FtsDeletePayload::from_bytes(&record.payload) {
Ok(p) => p,
Err(e) => {
tracing::warn!(
core = self.core_id,
lsn = record_lsn,
error = %e,
"WAL FTS replay: failed to decode FtsDeletePayload; skipping"
);
skipped += 1;
continue;
}
};
if tombstones.is_tombstoned(
database_id.as_u64(),
tenant_id,
&payload.collection,
record_lsn,
) {
skipped += 1;
continue;
}
let surrogate = match u32::from_str_radix(&payload.doc_id, 16) {
Ok(raw) => Surrogate::new(raw),
Err(_) => {
tracing::warn!(
core = self.core_id,
lsn = record_lsn,
doc_id = %payload.doc_id,
"WAL FTS replay: doc_id is not a valid hex surrogate; skipping"
);
skipped += 1;
continue;
}
};
let prov = payload.provenance.clone();
let vshard = crate::types::VShardId::from_collection_in_database(
database_id,
&payload.collection,
);
let task = Self::replay_fts_task(
nodedb_types::TenantId::new(tenant_id),
database_id,
vshard,
PhysicalPlan::Text(TextOp::FtsDeleteDoc {
collection: payload.collection.clone(),
surrogate,
provenance: Some(prov.clone()),
}),
);
let response = self.execute_fts_delete_doc(
&task,
tenant_id,
&payload.collection,
surrogate,
Some(&prov),
);
if response.status != crate::bridge::envelope::Status::Ok {
tracing::warn!(
core = self.core_id,
collection = %payload.collection,
lsn = record_lsn,
"WAL FTS replay: FtsDelete handler returned error; skipping"
);
skipped += 1;
continue;
}
deleted += 1;
}
}
if indexed > 0 || deleted > 0 {
tracing::info!(
core = self.core_id,
indexed,
deleted,
skipped,
"WAL FTS replay complete"
);
}
}
}