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// SPDX-License-Identifier: BUSL-1.1
//! Calvin multi-shard distributed dispatch.
//!
//! Handles the strict multi-shard path via the Calvin sequencer, including
//! the OLLP-dependent-predicate variant that runs an optimistic pre-execution
//! scan before submitting the transaction.
use pgwire::api::results::Response;
use pgwire::error::{ErrorInfo, PgWireError, PgWireResult};
use crate::control::planner::calvin::{
TxnDispatchPosition, dispatch_dependent_edge_recon, dispatch_tasks_to_calvin,
is_dependent_predicate,
};
use crate::control::security::identity::AuthenticatedIdentity;
use crate::control::server::shared::session::TransactionState;
use crate::types::TenantId;
use nodedb_physical::physical_task::PhysicalTask;
use super::super::super::types::error_to_sqlstate;
use super::super::core::NodeDbPgHandler;
use super::planning::calvin_execution_response;
impl NodeDbPgHandler {
/// Drive Calvin strict multi-shard dispatch for the given task set.
///
/// Returns the response vec on success (one tag per task). The caller
/// should return this immediately — Calvin tasks do not go through the
/// per-task dispatch loop.
pub(super) async fn dispatch_calvin_multishard(
&self,
tasks: Vec<PhysicalTask>,
tenant_id: TenantId,
_identity: &AuthenticatedIdentity,
addr: &std::net::SocketAddr,
result_formats: &[pgwire::api::results::FieldFormat],
) -> PgWireResult<Vec<Response>> {
let cross_shard_mode = self.sessions.cross_shard_txn_mode(addr);
let tx_state = self.sessions.transaction_state(addr);
let database_id = self
.sessions
.get_current_database(addr)
.unwrap_or(crate::types::DatabaseId::DEFAULT);
// Presence guard preserved from the inlined implementation: BOTH the
// static and OLLP paths require the completion registry to be wired, so
// an absent registry rejects either path with `SequencerUnavailable`
// here, before any classification or scan. The OLLP body re-fetches the
// registry itself; this check keeps the static path's rejection
// behaviour byte-identical.
if self.state.calvin_completion_registry.get().is_none() {
let (severity, code, message) = error_to_sqlstate(&crate::Error::SequencerUnavailable);
return Err(PgWireError::UserError(Box::new(ErrorInfo::new(
severity.to_owned(),
code.to_owned(),
message,
))));
}
let dependent_task = tasks.iter().find(|t| is_dependent_predicate(&t.plan));
// Static (non-OLLP) Calvin path: build the TxClass and route the
// submit-and-await to the SEQUENCER-GROUP leader via
// `submit_calvin_routed`. Submitting to the LOCAL inbox here is the
// silent-loss bug this fix addresses: only the sequencer leader's service
// assigns and only its registry receives the replicated completion ack,
// so a submit on a non-leader coordinator never completes. Routing fixes
// that for cross-shard document writes from any coordinator.
//
// The OLLP (dependent-predicate) path below is COORDINATOR-OWNED: this
// handler runs `run_dependent_with_retry`, which owns the
// submit → await-assignment → await-completion loop and, on a post-exec
// predicate-drift mismatch, runs a FRESH pre-execution reconnaissance
// before resubmitting (the scheduler releases the aborted attempt's
// locks and only signals the mismatch back — it no longer re-submits a
// stale prediction). The submit step ROUTES to the sequencer-group leader
// via `submit_calvin_routed_assign` (returning the leader-assigned
// assignment) while the completion is awaited on this coordinator's local
// registry, which receives the replicated completion ack on every
// sequencer-group member. This makes the dependent path complete from a
// non-leader coordinator, unifying single-node and cross-node into one
// path, while still passing through this node's circuit-breaker / budget
// gate.
if dependent_task.is_none() {
// Static (non-OLLP) path: delegate to the protocol-neutral
// `dispatch_tasks_to_calvin` helper, supplying the session-derived
// inputs (cross-shard mode, in-block state) it needs as parameters.
// The helper classifies, rejects cross-shard writes inside an
// explicit transaction block, builds the static TxClass, and routes
// the SINGLE submit-and-await to the sequencer leader. On success we
// synthesise one command tag per task. This is a pure extraction —
// behaviour is identical to the inlined static branch.
// A cross-shard span in a single statement executed mid-block cannot
// be buffered atomically, so it rejects; an autocommit statement
// proceeds. (The COMMIT flush of a buffered block routes through the
// neutral commit orchestrator, not this per-statement path.)
let position = if tx_state == TransactionState::InBlock {
TxnDispatchPosition::MidBlockStatement
} else {
TxnDispatchPosition::Autocommit
};
let apply_resp = dispatch_tasks_to_calvin(
&self.state,
&tasks,
tenant_id,
cross_shard_mode,
position,
&[],
None,
)
.await
.map_err(|e| {
let (severity, code, message) = error_to_sqlstate(&e);
PgWireError::UserError(Box::new(ErrorInfo::new(
severity.to_owned(),
code.to_owned(),
message,
)))
})?;
let mut calvin_responses: Vec<Response> = Vec::with_capacity(tasks.len());
for task in &tasks {
calvin_responses.push(calvin_execution_response(
task,
apply_resp.as_ref(),
&self.state,
tenant_id,
database_id,
result_formats,
)?);
}
return Ok(calvin_responses);
}
// OLLP path: delegate the full reconnaissance + atomic-submit + drift-
// retry orchestration to the protocol-neutral
// `dispatch_dependent_edge_recon`. The dependent task is guaranteed
// present (the static path returned early above); its `database_id` is
// the recon scan's database. On `Ok` we synthesise the SAME response —
// one CommandComplete tag per accumulated task — and on `Err` we map the
// typed `crate::Error` through the existing pgwire error→SQLSTATE path,
// so externally observable behaviour is byte-identical.
let database_id = dependent_task
.ok_or_else(|| {
// Unreachable: the static (non-dependent) path returns early
// above. Surface a typed error rather than panicking if the
// invariant is ever broken by a future refactor.
PgWireError::UserError(Box::new(ErrorInfo::new(
"ERROR".to_owned(),
"XX000".to_owned(),
"internal: static Calvin path reached the OLLP dispatch branch".to_owned(),
)))
})?
.database_id;
// Run the recon/OLLP dispatch, which drains this coordinator's sidecar
// and returns the applied Data-Plane Response for the RETURNING doc
// write (if any). `tasks` is cloned into the recon call so the original
// list survives to shape the per-task responses afterwards: a RETURNING
// task emits its rows, every other task its command tag.
// Normal multi-shard OLLP dispatch (NOT the contended single-shard
// route from `route_write_to_calvin`), so it stays on the strict
// multi-vshard dependent `TxClass` builder (`allow_single_vshard:
// false`).
let outcome = dispatch_dependent_edge_recon(
&self.state,
tasks.clone(),
tenant_id,
database_id,
false,
)
.await
.map_err(|e| {
let (severity, code, message) = error_to_sqlstate(&e);
PgWireError::UserError(Box::new(ErrorInfo::new(
severity.to_owned(),
code.to_owned(),
message,
)))
})?;
let mut calvin_responses: Vec<Response> = Vec::with_capacity(tasks.len());
for task in &tasks {
calvin_responses.push(calvin_execution_response(
task,
outcome.apply_result.as_ref(),
&self.state,
tenant_id,
database_id,
result_formats,
)?);
}
Ok(calvin_responses)
}
}