Native: read workflow descriptions from one bounded coherent snapshot #1075

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1. rmcdaniel

   added

   kind:featureA public product capability or experience is requestedA public product capability or experience is requested

   priority:P0Immediate release or data-integrity riskImmediate release or data-integrity risk

   repo:serverOwned by the standalone server repositoryOwned by the standalone server repository

   completion:evidence-requiredClose only after all explicit acceptance and operational evidence is publicClose only after all explicit acceptance and operational evidence is public

   agent:server

   on Nov 6, 2026
2. rmcdaniel commented on Nov 6, 2026

   

   rmcdaniel

   on Nov 6, 2026

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   Sanitized external reference for topic 21: 0003-Describe-a-run-in-one-read-only-snapshot-on-one-conn.patch, part 1/1. Complete sanitized diff: 16,009 bytes / SHA-256 e67896e4d65d19afe959cecbc626aea63ffcb74b9b525ec00a7778a771f07d27. Ordered parts preserve the complete diff bytes; none was applied or executed. The patch is a cumulative older-source draft, not maintained implementation or qualification. Mail headers/author/date/message/application instructions were removed.

   diff --git a/rust/src/runtime/run_describe.rs b/rust/src/runtime/run_describe.rs
   index d76a21f2..e76e3c5a 100644
   --- a/rust/src/runtime/run_describe.rs
   +++ b/rust/src/runtime/run_describe.rs
   @@ -11,6 +11,7 @@ use super::{
        backend::Backend,
        store::{Store, now},
        task_queues::json_time,
   +    transaction::Transaction,
    };
    use chrono::{DateTime, Utc};
    use serde_json::{Map, Value, json};
   @@ -76,21 +77,38 @@ where
        /// The registered query route for a run row, with workers whose
        /// heartbeat is newer than `stale_after` seconds.
        pub(super) async fn query_route(&self, run: &DB::Row, stale_after: i64) -> Result<super::query_route::QueryRoute> {
   -        let task_queue = super::query_route::trimmed(DB::optional_string(run, "queue")?.as_deref()).unwrap_or("default").to_owned();
   -        let workflow_type = DB::optional_string(run, "workflow_type")?;
   -        let compatibility = DB::optional_string(run, "compatibility")?;
   -        let started = Self::query("SELECT payload FROM workflow_history_events WHERE workflow_run_id=$1 AND event_type='WorkflowStarted' ORDER BY sequence LIMIT 1")
   -            .bind(DB::string(run, "id")?)
   -            .fetch_optional(&self.pool)
   +        let mut connection = self.pool.acquire().await?;
   +        let started = Self::started_payload(&mut connection, &DB::string(run, "id")?).await?;
   +        self.query_route_on(&mut connection, run, stale_after, &started).await
   +    }
   +
   +    /// The run's `WorkflowStarted` payload, or null.
   +    async fn started_payload(connection: &mut DB::Connection, run_id: &str) -> Result<Value> {
   +        Ok(Self::query("SELECT payload FROM workflow_history_events WHERE workflow_run_id=$1 AND event_type='WorkflowStarted' ORDER BY sequence LIMIT 1")
   +            .bind(run_id)
   +            .fetch_optional(&mut *connection)
                .await?
                .map(|row| DB::document_row(&row, "payload"))
                .transpose()?
   -            .unwrap_or(Value::Null);
   +            .unwrap_or(Value::Null))
   +    }
   +
   +    /// `query_route` on a given connection, with the run's start payload.
   +    async fn query_route_on(
   +        &self,
   +        connection: &mut DB::Connection,
   +        run: &DB::Row,
   +        stale_after: i64,
   +        started: &Value,
   +    ) -> Result<super::query_route::QueryRoute> {
   +        let task_queue = super::query_route::trimmed(DB::optional_string(run, "queue")?.as_deref()).unwrap_or("default").to_owned();
   +        let workflow_type = DB::optional_string(run, "workflow_type")?;
   +        let compatibility = DB::optional_string(run, "compatibility")?;
            let fresh_after = now() - chrono::Duration::seconds(stale_after.max(1));
            let rows = Self::query("SELECT capabilities,supported_workflow_types,build_id,workflow_definition_fingerprints,last_heartbeat_at FROM workflow_worker_registrations WHERE namespace=$1 AND task_queue=$2 AND status='active' ORDER BY worker_id")
                .bind(self.namespace.as_ref())
                .bind(task_queue.as_str())
   -            .fetch_all(&self.pool)
   +            .fetch_all(&mut *connection)
                .await?;
            let mut workers = Vec::with_capacity(rows.len());
            for row in rows {
   @@ -109,16 +127,15 @@ where
                &task_queue,
                super::query_route::trimmed(workflow_type.as_deref()),
                super::query_route::trimmed(compatibility.as_deref()),
   -            &started,
   +            started,
                &workers,
            ))
        }
    
        /// `WorkflowRun::typedSearchAttributes`, sorted by key; PHP renders an
        /// empty set as `[]`.
   -    async fn typed_search_attributes(&self, run_id: &str) -> Result<Value> {
   -        let mut connection = self.pool.acquire().await?;
   -        let rows = Self::typed_rows(&mut connection, run_id).await?;
   +    async fn typed_search_attributes(connection: &mut DB::Connection, run_id: &str) -> Result<Value> {
   +        let rows = Self::typed_rows(connection, run_id).await?;
            Ok(if rows.is_empty() {
                json!([])
            } else {
   @@ -186,7 +203,7 @@ where
                ..Default::default()
            };
            rows.summary = next().into_iter().next();
   -        rows.search_attributes = self.typed_search_attributes(run_id).await?;
   +        rows.search_attributes = Self::typed_search_attributes(&mut *self.pool.acquire().await?, run_id).await?;
            if let Some(summary) = &rows.summary {
                rows.task_problem_badge = super::run_diagnostics::task_problem_badge(
                    summary["task_problem"].as_bool().unwrap_or(false),
   @@ -198,10 +215,10 @@ where
        }
    
        /// `runUpdateDiagnostics`: the run's updates in command order.
   -    async fn update_diagnostics(&self, run_id: &str) -> Result<Vec<Value>> {
   +    async fn update_diagnostics(connection: &mut DB::Connection, run_id: &str) -> Result<Vec<Value>> {
            let rows = Self::query("SELECT id,workflow_command_id,workflow_instance_id,workflow_run_id,target_scope,requested_workflow_run_id,resolved_workflow_run_id,update_name,status,outcome,command_sequence,workflow_sequence,rejection_reason,validation_errors,failure_id,failure_message,accepted_at,applied_at,rejected_at,closed_at FROM workflow_updates WHERE workflow_run_id=$1 ORDER BY command_sequence,created_at,id")
                .bind(run_id)
   -            .fetch_all(&self.pool)
   +            .fetch_all(&mut *connection)
                .await?;
            let mut updates = Vec::with_capacity(rows.len());
            for row in rows {
   @@ -227,9 +244,14 @@ where
        /// A run's compatibility marker and whether the live fleet supports it,
        /// as describe and history report them.
        pub(super) async fn compatibility_fields(&self, run: &DB::Row) -> Result<Map<String, Value>> {
   +        self.compatibility_fields_on(&mut *self.pool.acquire().await?, run).await
   +    }
   +
   +    /// `compatibility_fields` on a given connection.
   +    async fn compatibility_fields_on(&self, connection: &mut DB::Connection, run: &DB::Row) -> Result<Map<String, Value>> {
            let compatibility = DB::optional_string(run, "compatibility")?;
            let queue = DB::optional_string(run, "queue")?;
   -        let snapshots = self.fleet_snapshots(now()).await?;
   +        let snapshots = self.fleet_snapshots_on(connection, now()).await?;
            let (supported, fleet_reason) = super::run_diagnostics::fleet_supports(
                &snapshots,
                compatibility.as_deref().map(str::trim).filter(|value| !value.is_empty()),
   @@ -243,9 +265,11 @@ where
            ]))
        }
    
   -    /// The fields `formatRun` adds for a described run row.
   +    /// The fields `formatRun` adds for a described run row, read in
   +    /// describe's snapshot.
        pub(super) async fn describe_fields(
            &self,
   +        tx: &mut Transaction<'_, DB>,
            run: &DB::Row,
            current: bool,
            terminal: bool,
   @@ -255,27 +279,21 @@ where
        ) -> Result<Map<String, Value>> {
            let run_id = DB::string(run, "id")?;
            let status = DB::string(run, "status")?;
   -        let started = Self::query("SELECT payload FROM workflow_history_events WHERE workflow_run_id=$1 AND event_type='WorkflowStarted' ORDER BY sequence LIMIT 1")
   -            .bind(run_id.as_str())
   -            .fetch_optional(&self.pool)
   -            .await?
   -            .map(|row| DB::document_row(&row, "payload"))
   -            .transpose()?
   -            .unwrap_or(Value::Null);
   +        let started = Self::started_payload(tx, &run_id).await?;
            let summary = Self::query("SELECT wait_kind,wait_reason FROM workflow_run_summaries WHERE id=$1")
                .bind(run_id.as_str())
   -            .fetch_optional(&self.pool)
   +            .fetch_optional(&mut **tx)
                .await?;
            let (wait_kind, wait_reason) = match summary {
                Some(row) => (DB::optional_string(&row, "wait_kind")?, DB::optional_string(&row, "wait_reason")?),
                None => (None, None),
            };
   -        let compatibility = self.compatibility_fields(run).await?;
   +        let compatibility = self.compatibility_fields_on(tx, run).await?;
            // `canServeQuery`: failed, cancelled and terminated runs refuse
            // queries; others need a registered route.
            let query_servable = current
                && (!terminal || status == "completed")
   -            && self.query_route(run, stale_after).await?.servable;
   +            && self.query_route_on(tx, run, stale_after, &started).await?.servable;
            let archived = DB::optional_instant(run, "archived_at")?.is_some();
            let (input_omitted, output_omitted) = (oversized(input), oversized(output));
            let mut fields = Map::new();
   @@ -293,10 +311,7 @@ where
            let routing = if DB::optional_string(run, "import_source")?.as_deref() == Some(super::waterline_import::IMPORT_SOURCE) {
                Value::Null
            } else {
   -            let mut tx = self.begin_read().await?;
   -            let routing = self.definition_inspect(&mut tx, run, None).await?;
   -            tx.commit().await?;
   -            routing
   +            self.definition_inspect(tx, run, None).await?
            };
            fields.insert("definition_routing".into(), routing);
            fields.insert("payload_previews".into(), json!({"input_omitted":input_omitted,"output_omitted":output_omitted,
   @@ -304,14 +319,12 @@ where
            fields.insert("last_progress_at".into(), iso8601(DB::optional_instant(run, "last_progress_at")?));
            fields.insert("wait_kind".into(), json!(wait_kind));
            fields.insert("wait_reason".into(), json!(wait_reason));
   -        fields.insert("search_attributes".into(), self.typed_search_attributes(&run_id).await?);
   +        fields.insert("search_attributes".into(), Self::typed_search_attributes(tx, &run_id).await?);
            fields.insert("actions".into(), actions(current, terminal, archived, query_servable));
            fields.insert("updates_scope".into(), json!("selected_run"));
   -        fields.insert("updates".into(), json!(self.update_diagnostics(&run_id).await?));
   +        fields.insert("updates".into(), json!(Self::update_diagnostics(tx, &run_id).await?));
            // `terminalFailurePayload`: a failed run's failure, last (Server #967).
   -        let mut tx = self.begin_read().await?;
   -        let failure = Self::terminal_failure_describe(&mut tx, &run_id, DB::string(run, "status")?.as_str()).await?;
   -        tx.commit().await?;
   +        let failure = Self::terminal_failure_describe(tx, &run_id, DB::string(run, "status")?.as_str()).await?;
            for (key, value) in failure.into_iter().flatten() {
                fields.insert(key.into(), value);
            }
   diff --git a/rust/src/runtime/run_diagnostics.rs b/rust/src/runtime/run_diagnostics.rs
   index 03c4bca7..aa413fae 100644
   --- a/rust/src/runtime/run_diagnostics.rs
   +++ b/rust/src/runtime/run_diagnostics.rs
   @@ -428,8 +428,17 @@ where
        /// `WorkflowCompatibilityFleet::detailsForNamespace` from the
        /// registrations whose heartbeat is within the fleet window.
        pub(super) async fn fleet_snapshots(&self, at: DateTime<Utc>) -> Result<Vec<(String, Option<String>, Vec<String>, DateTime<Utc>)>> {
   +        self.fleet_snapshots_on(&mut *self.pool.acquire().await?, at).await
   +    }
   +
   +    /// `fleet_snapshots` on a given connection.
   +    pub(super) async fn fleet_snapshots_on(
   +        &self,
   +        connection: &mut DB::Connection,
   +        at: DateTime<Utc>,
   +    ) -> Result<Vec<(String, Option<String>, Vec<String>, DateTime<Utc>)>> {
            let rows = Self::query("SELECT worker_id,task_queue,build_id,last_heartbeat_at FROM workflow_worker_registrations WHERE namespace=$1 AND last_heartbeat_at IS NOT NULL")
   -            .bind(self.namespace.as_ref()).fetch_all(&self.pool).await?;
   +            .bind(self.namespace.as_ref()).fetch_all(&mut *connection).await?;
            let mut snapshots = Vec::new();
            for row in rows {
                let Some(heartbeat) = DB::optional_instant(&row, "last_heartbeat_at")? else { continue };
   diff --git a/rust/src/runtime/store.rs b/rust/src/runtime/store.rs
   index b2b5b71c..64765366 100644
   --- a/rust/src/runtime/store.rs
   +++ b/rust/src/runtime/store.rs
   @@ -773,6 +773,19 @@ where
                .bind(run_id)
                .fetch_all(&self.pool)
                .await?;
   +        self.decoded_memo(memo_rows).await
   +    }
   +
   +    /// `run_memo` on a given connection.
   +    async fn run_memo_on(&self, connection: &mut DB::Connection, run_id: &str) -> Result<Value> {
   +        let memo_rows = Self::query(DB::MEMO_READ)
   +            .bind(run_id)
   +            .fetch_all(&mut *connection)
   +            .await?;
   +        self.decoded_memo(memo_rows).await
   +    }
   +
   +    async fn decoded_memo(&self, memo_rows: Vec<DB::Row>) -> Result<Value> {
            let mut stored = Vec::with_capacity(memo_rows.len());
            for memo in memo_rows {
                let portable = if DB::optional_number(&memo, "portable_value_sequence")?
   @@ -801,11 +814,15 @@ where
        /// The run description; with a worker stale window it also carries the
        /// fields PHP's `formatRun` adds (actions, fleet, wait and updates).
        pub(crate) async fn describe_with(&self, workflow_id: &str, run_id: Option<&str>, stale_after: Option<i64>) -> Result<Value> {
   +        // Every read of a description shares one read-only snapshot and one
   +        // pool connection, so a described run is consistent and describing
   +        // takes the pool's connections from transitions as little as it can.
   +        let mut tx = self.begin_read().await?;
            let row = Self::query("SELECT r.*,i.execution_timeout_seconds,i.current_run_id,(SELECT parent_workflow_run_id FROM workflow_links l WHERE l.child_workflow_run_id=r.id AND l.link_type='continue_as_new' LIMIT 1) AS continued_from_run_id,(SELECT COUNT(*) FROM workflow_runs counted WHERE counted.workflow_instance_id=i.id) AS run_count FROM workflow_runs r JOIN workflow_instances i ON i.id=r.workflow_instance_id WHERE i.id=$1 AND r.id=COALESCE($2,i.current_run_id) AND r.namespace=$3")
   -            .bind(workflow_id).bind(run_id).bind(self.namespace.as_ref()).fetch_optional(&self.pool).await?
   +            .bind(workflow_id).bind(run_id).bind(self.namespace.as_ref()).fetch_optional(&mut *tx).await?
                .ok_or_else(|| refuse(StatusCode::NOT_FOUND, if run_id.is_some() {"run_not_found"} else {"instance_not_found"}))?;
            let output = DB::optional_string(&row, "output")?;
   -        let memo = self.run_memo(&DB::string(&row, "id")?).await?;
   +        let memo = self.run_memo_on(&mut tx, &DB::string(&row, "id")?).await?;
            let status = DB::string(&row, "status")?;
            let terminal = matches!(
                status.as_str(),
   @@ -818,7 +835,7 @@ where
            // Only a stored external reference is read, to tell whether its preview
            // is omitted; inline payloads stay unread.
            let command_rows = Self::query(DB::RUN_COMMANDS_SQL)
   -            .bind(DB::string(&row, "id")?).bind(workflow_id).fetch_all(&self.pool).await?;
   +            .bind(DB::string(&row, "id")?).bind(workflow_id).fetch_all(&mut *tx).await?;
            let mut commands = Vec::with_capacity(command_rows.len());
            let mut reason_codec = None;
            for command in command_rows {
   @@ -889,10 +906,11 @@ where
                "run_deadline_at": super::run_describe::iso8601(DB::optional_instant(&row,"run_deadline_at")?)});
            if let Some(stale_after) = stale_after {
                let fields = self
   -                .describe_fields(&row, current, terminal, &described["input_envelope"], &described["output_envelope"], stale_after)
   +                .describe_fields(&mut tx, &row, current, terminal, &described["input_envelope"], &described["output_envelope"], stale_after)
                    .await?;
                described.as_object_mut().expect("description object").extend(fields);
            }
   +        tx.commit().await?;
            // `formatRun` for a Waterline v1 projection: no control-plane
            // description, every action off, the stored codec and progress time,
            // and the projection's metadata.
3. rmcdaniel commented on Nov 6, 2026

   

   rmcdaniel

   on Nov 6, 2026

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   Intake is filed as P0, owner server. Shared index, allocation and static review findings.

   Complete sanitized diff reference(s): 0003 part 1/1.

   Shared Lockbox bundle: lab4/general/dw-performance-intake/2026-11-06/sanitized-tricks-20-25.zip (101,306 bytes; SHA-256 3e5b593ed89536451be1c8d74abf2ee6e4782cd3f7a75fe5fc9a645d648a52da). Its roundtrip and member hashes are verified. The supplied patches and benchmark results remain external reference data; no patch was applied or executed during intake. Existing issue acceptance and subsequent owner review remain in force.
4. rmcdaniel commented on Nov 7, 2026

   

   rmcdaniel

   on Nov 7, 2026

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   An implementation is prepared locally and not yet published: commit 581e08c4, tree 8a6223469151ff699b4f50ec9375c24609c0c017, on main 1c34f3b7 (branch feat/server-1075-describe-snapshot). It follows the #325 runner successor and #1093 in General's Source-train ordering.

   What it does

   • describe_with opens one begin_read transaction and routes every description read through that one connection: run row, memo, commands, summary wait fields, fleet snapshots, query route, definition routing, typed search attributes, updates, terminal failure, and v1 projection metadata/failure.
   • The snapshot primitives are the existing ones: PostgreSQL REPEATABLE READ READ ONLY, MySQL START TRANSACTION WITH CONSISTENT SNAPSHOT, READ ONLY, SQLite deferred BEGIN on a WAL database.
   • An error drops the transaction, which rolls it back. The connection lives for exactly one description, and nothing inside takes a second pool connection.
   • The WorkflowStarted payload is read once and passed to the query route and definition routing. Other callers of those helpers keep their own reads through unchanged pool wrappers.
   • DTOs, authorization, routing and absent-run refusals are unchanged.

   Controls (qualify_describe_snapshot, wired for SQLite, PostgreSQL and MySQL)

   • One start-payload read per describe; it was 2 before this change.
   • Inside one snapshot, after describe has started, the test commits changes to workflow_runs.business_key and workflow_run_summaries.wait_reason from another connection. A second describe in the same snapshot is byte-identical to the first, and a fresh describe shows the change.
   • Negative control: moving only the run-row read back to the pool makes this test fail.

   Local result (lab4, CI's pinned Rust image): 413 runtime library tests and the full SQLite execution suite (738 passed, 1 existing ignore). PostgreSQL/MySQL coverage comes from the normal PR checks. Measured checkout/query reduction under load is not claimed here.

   Owner: Server.
5. rmcdaniel commented on Nov 8, 2026

   

   rmcdaniel

   on Nov 8, 2026

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   Operator nudge: this benchmax ticket (P0) has had no linked PR and no activity for about 8 h. Please pick it up next, after the current work on #1057. Suggested order for the stalled server tickets: #1063, #1068, #1075, #1077, #1078, #1079, then #1081 (P2); this one is 3 of 7. Open a draft PR as soon as work starts so the tracker shows it. If it is blocked, add the status:blocked label with a one-line reason.
6. rmcdaniel

   added

   agent:general

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   agent:server

   on Nov 8, 2026
7. rmcdaniel commented on Nov 9, 2026

   

   rmcdaniel

   on Nov 9, 2026

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   General reviewed the preserved WIP 581e08c4 against maintained Server main 603f9f5c. The original WIP ref is unchanged; no cherry-pick, build, test or push ran.

   One acceptance gap must be fixed when porting it: WIP describe_with calls the ordinary begin_read. On current MySQL/MariaDB that uses START TRANSACTION WITH CONSISTENT SNAPSHOT, READ ONLY, which preserves the session isolation level and does not fix a snapshot under READ COMMITTED. Main already has a causal backend control, qualification_repeatable_snapshot_is_fixed_under_a_read_committed_session, proving that the ordinary begin sees a later commit while REPEATABLE_READ_SNAPSHOT_BEGIN does not.

   Use the existing Store::begin_repeatable_read for the description instead of changing global/session defaults. PostgreSQL's helper already selects a repeatable read-only snapshot; SQLite retains its existing transaction form. The WIP's test currently checks two descriptions in one default-session transaction and does not force the MySQL/MariaDB READ COMMITTED counterexample.

   The port therefore needs an actual concurrent transition/describe control on each backend, explicitly including READ COMMITTED MySQL/MariaDB; one start-payload read; a single-connection description path; and bounded connection return on success, missing/deleted-run errors and cancellation. Preserve all DTO, authorization, routing and projection behavior. The WIP is still unqualified. This remains behind the current 3.3.1 consumer follow-through and #1068 correction, with no new source train selected.
8. rmcdaniel commented on Nov 9, 2026

   

   rmcdaniel

   on Nov 9, 2026

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   General has ported the preserved preparation to maintained source, locally only. Original WIP 581e08c4 is unchanged.

   Candidate 684f1d478ab3693affedda71718d3f85deb7081b, tree 390625347736ff62a7e1cf250c4ef9b98ab95493, parent/main 603f9f5c. Delta35,191 bytes / SHA-256 5e3a7d1a03affa3c4ac3ec8d040ad27016579d67940e04781c4ddd52e0a18b15, ten runtime files. It uses the existing begin_repeatable_read, not the preparation's ordinary begin_read, so MySQL/MariaDB READ COMMITTED sessions get a fixed snapshot. Every description read uses that connection; native start payload is shared with query/definition routing. The projection's first-event metadata read retains its distinct authority.

   The old preparation's two-describe control is replaced by a test-only, task-local pause immediately after the run row. A real close_workflow(Terminate) commits through an independent writer pool before description resumes. New controls compare the complete description with its pre-transition value, require one pool checkout and one native start-payload read, observe the fresh terminal state, and verify connection return after missing instance/run, a real stored-memo decoding error and cancellation. Readers have a one-connection pool. MySQL/MariaDB exercise explicit REPEATABLE READ plus READ COMMITTED; an ordinary-read counterexample must mix the later command journal, before and after the one-transaction repeatable override. PostgreSQL and read-only SQLite use the same concurrent transition control.

   Only source/diff/privacy checks ran. No compile, runtime test, local daemon or hosted push is claimed. First compile and execution will be the normal source train after #1110's integration/main custody; it is the only current integration train. This item is outside released3.3.1 and has no benchmark claim.
9. rmcdaniel

   closed this as completedon Nov 9, 2026