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Forward-port 0.6.16 to main, step 2: batch inserts, new lanes and review fixes - #728
Second step of bringing 0.6.16 and 0.6.17 to main, after #725.
Ported
fix(insert): make the batch insert function give way instead of deadlocking (0.6) #700, v057: the batch insert function gives way instead of deadlocking.awa.insert_jobs_compat_batch takes its claims and lanes in a subtransaction with bounded lock waits, rolls back and retries after a short randomised pause, and makes one final attempt with ordinary waits after 2 s. Same lock budget, retry timing and caught SQLSTATEs as the 0.6 schema patch.
fix(0.6): claim batch index check, SET-only migrator grants, and review follow-ups #701, v056 and the 0.6.16 review fixes: the claim batch index function recognises only a full job_ids GIN index, tests for the batch function's failing unique-conflict mode and the lane contention benchmark's row counts, and the docs say a batch insert holds a lane's enqueue lock until its transaction ends.
Migrations
v056 and v057 replace functions only: no table DDL and no lock on any awa or queue-storage table. A database coming from 0.6.16 or later already has both bodies from its schema patches.
Both have sections in docs/upgrade-0.6-to-0.7.md, and CURRENT_VERSION is 57.
Unmerged branches that also use v056 or v057 (brian/enqueue-fold, brian/admin-operations-redesign, ccr-37ca53f6-xza211-land-570) will need renumbering when they land.
Verification
cargo fmt and workspace clippy with -D warnings are clean.
A read-only review compared v056, v057, the Rust lane-order change, the TLA+ model and the tests with the 0.6 originals and found them equivalent in effect. Minor points it raised: the CHANGELOG and upgrade-guide wording about a 0.6.16 database "already carrying" the bodies is true in effect but not literally, because v055 reinstalls the old body first in the same transaction; and the batch function returns rows from unnest without an explicit ORDER BY, as on 0.6.
Not run locally: TLC (the reviewer could not confirm the new state counts in MAPPING.md) and an upgrade rehearsal from a 0.6.17 database. CI covers both.
…tch index (v056, forward-port #701)
ensure_claim_batch_job_index reported a claim partition indexed when it had any valid GIN index whose definition named job_ids, a partial one included, and its CREATE INDEX IF NOT EXISTS took another index or relation that already had the index's name for the index, so claim prune could skip building the real one. It now accepts only a valid, non-partial GIN index on job_ids alone with the default opclass. When something else has the index's name it raises a warning naming it, returns false and leaves it in place.
refresh_claim_batch_job_index_helper reset EXECUTE before it handed the function to the table owner. A migration role that owns the function but may only SET ROLE to the table owner (PostgreSQL 16+ membership WITH INHERIT FALSE) could no longer revoke or grant on it after the transfer, PostgreSQL only warned, and EXECUTE stayed with PUBLIC. The helper now resets EXECUTE after the transfer, acting as the new owner when it cannot as itself, and restores the caller's role.
0.6 shipped this by re-applying its claim_batch_job_index schema patch, with a probe that kept the 0.6.15 function pending. On main it is migration v056, which reinstalls the function in every discovered queue-storage schema as v054 does, builds and drops no index and takes no table lock. main's function already pinned quote_all_identifiers off, so that part of the 0.6 change is not needed.
The role test's last phase applies v054 to v056 with the owner as the effective role in place of the 0.6 patch run, and first revokes the schema CREATE it granted the migration role, which main's migration preflight refuses.
…ct mode (forward-port #701)
The Rust entry points pass p_skip_unique_conflicts = true whenever a batch has a unique key, so only a direct caller of awa.insert_jobs_compat_batch reaches the mode that fails the batch. The test calls the function with the flag off, on queue storage and on canonical storage, and requires a conflict with an already claimed key or within the batch to fail with 23505 and leave nothing behind.
The module comment says a lane's lock is taken when the batch reaches the lane and held until the transaction ends.
…on benchmark (forward-port #701)
The benchmark counted a batch's requested jobs as inserted, so a skipping insert that left out jobs with a taken unique key overstated throughput, and lane integrity only required at least that many rows to have landed. It now counts the rows each insert returns, reports requested and inserted separately, and requires the rows that landed to equal the rows the inserts returned over the whole run.
…ransaction ends (forward-port #701)
The v055 section of the upgrade guide, the troubleshooting entry on lane contention and the comment in insert.rs said the batch function holds a lane lock only for the lane write and the commit. The lock is transaction-scoped: the function takes it when the batch reaches the lane instead of at the batch's first ready row, and it is held until the calling transaction ends.
…visioning lock (forward-port #702)
QueueStorage::ensure_lane_inserts took a new lane's provisioning lock and then wrote its queue_lanes row, while SQL inserts write the row first and take the lock in the head-table trigger that creates the lane's sequences. A QueueStorage batch enqueue or promotion and an insert, insert_many or insert_many_copy that were both first to use the same (queue, priority) each held what the other waited for, and one failed with 40P01 (#692). ensure_lane_inserts now writes the row first. Lanes that already exist were never affected, and there is no schema change.
main had the same order as 0.6: without the fix the three new tests that start with a QueueStorage batch fail here with deadlock detected. The tests stall the first producer inside the lane's sequence creation with a gate transaction that holds an uncommitted sequence of the same name, observe the second producer blocked, and require both to commit. The role test that watches a second first touch wait now reads pg_stat_activity, since the waiter can block on the lane row instead of the advisory lock.
…r spec (forward-port #702)
AwaStorageLockOrder collapsed a lane's queue_lanes row and provisioning lock into its enqueue lock, so it could not see the #692 deadlock between a QueueStorage process and a SQL producer that are both first to use a lane. It now models both: ProvisionLanePlan takes the row, then the provisioning lock, then the enqueue lock, as every producer does, and the main config stays deadlock-free (2,629,707 distinct states). AwaStorageLockOrderOldLaneProvisioningDeadlock.cfg keeps the earlier QueueStorage order and trips NoDeadlock in 5 steps.
The TLC suite runs that witness and the existing old striped-claim witness, which was documented but not run.
0.6 added the model in its 0.6.16 release preparation (#705) together with mapping notes for other changes; only the lane-provisioning parts are ported here.
…ocking (v057, forward-port #700)
awa.insert_jobs_compat_batch takes a batch's unique claims before its lane locks, while per-row producers take each job's claim and its lane together. A per-row transaction that held a lane the batch needed and then inserted a key the batch had claimed waited on the batch while the batch waited on it, and PostgreSQL aborted one of them with deadlock detected.
The function now takes its claims and lanes in a subtransaction and limits each lock wait to what remains of a budget measured from the attempt's start: 500 ms, or half of the session's deadlock_timeout when that is lower. A wait that would run longer rolls the attempt back, which releases every claim and lane it took, and the batch retries after a short randomised pause. The first attempt inserts the claims in one statement with a 10 ms wait and later bounded attempts go key by key. After four budgets of retries the batch makes one last attempt with ordinary waits, so contention or a cycle through locks the caller took earlier ends in success, a lock timeout or deadlock detected, never in endless retries. The caller's lock_timeout applies to each wait, and only a wait it ended raises lock_not_available to the caller.
0.6 shipped this by replacing the body of its insert_jobs_compat_batch schema patch, with a probe on the function body that kept the 0.6.15 body pending. main already has the function as migration v055, so the new body is migration v057: one CREATE OR REPLACE FUNCTION, no table DDL and no table locks. The body is 0.6's except that it reads the ready ring cursor through ring_cursor(), as v055 does. main has no patch probe, so the Rust side changes only its comment, and a binary ahead of the migration keeps calling the v055 body.
The tests are 0.6's. The schema test installs v055's body from the v055 migration in place of 0.6's fixture file and checks that awa migrate and the exported v057 SQL replace it. The contention benchmark's mode without the batch function removes the version rows from v055 on, so the next migration run still restores the function.
The pull request adds migrations v056 and v057. It tightens claim-batch index checks and grant handling, changes new-lane provisioning order, and adds bounded lock-wait retries to legacy batch inserts. It also updates concurrency tests, documentation, and CI settings.
Changes: Claim-Batch Index
Layer / File(s)
Summary
Index recognition and grant handling awa-model/migrations/v023_install_queue_storage_substrate.sql, docs/security/database-roles.md, CHANGELOG.md
The helper accepts only a valid, non-partial GIN index on job_ids alone. It preserves a conflicting object with the expected name and reports it. It also resets execution grants as the function owner and restores the caller’s prior role.
v056 migration and validation awa-model/migrations/v056_claim_batch_job_index_shape.sql, awa-model/src/migrations.rs, awa/tests/queue_storage_runtime_test.rs, awa/tests/lane_ownership_roles_test.rs, docs/upgrade-0.6-to-0.7.md
Migration v056 refreshes the helper for eligible queue-storage schemas and records the migration version. Tests cover full-index recognition, migration idempotence, and execution ACLs.
QueueStorage inserts the queue_lanes row before acquiring the provisioning lock. Tests and the lock-order model cover the new order and the historical deadlock order.
v057 bounded-wait batch function awa-model/migrations/v057_insert_jobs_compat_batch_bounded_wait.sql, awa-model/src/migrations.rs, awa-model/src/insert.rs, CHANGELOG.md
The v057 function preserves the existing signature and result behavior. For legacy storage, it retries lock waits in subtransactions, using bounded waits before a final attempt with ordinary waits.
Tests cover batch conflicts, caller timeouts, contention, and migration replacement. Benchmark output and documentation now report or describe the updated lock and retry behavior.
CI Settings
Layer / File(s)
Summary
Test workflow settings .github/workflows/ci.yml
The Rust test-shard timeout increases from 20 to 30 minutes. Python dependency installation uses psycopg[binary].
Issue 383 tracks forward-port work from 0.6; this pull request is described as one forward-port step.
Issue 679 concerns indexed claim-batch lookups; v056 changes recognition of the full job_ids GIN index.
Issue 681 asks for lane-lock coverage in the TLA+ model; this pull request adds a lane-provisioning deadlock witness and updates the lock-order model.
Possibly related PRs
hardbyte/awa#699: It introduced migrations v054 and v055 and the batch function that v057 replaces.
Suggested reviewers:claude
Merge Risk: Low · previous review 36cdd
The new lane-ordering fix does not cover direct calls to the installed provision_lane SQL function, which can still deadlock with QueueStorage on first use of a lane. A failing producer in one concurrency test can also hang the test suite instead of failing it. Both are narrow, and merging is reasonable once the owner has accepted or addressed them.
Pre-merge checks: 4
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The title names the PR's scope: forward-porting 0.6.16 fixes to main, covering batch inserts and new-lane handling. The changeset matches that: v056 and v057 migrations rework batch insert and claim-b…
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The title names the PR's scope: forward-porting 0.6.16 fixes to main, covering batch inserts and new-lane handling. The changeset matches that: v056 and v057 migrations rework batch insert and claim-batch index behavior, queue_storage.rs writes the queue_lanes row before the provisioning lock, and tests and TLA+ models back these changes. The title does not name the claim-batch index fix or the migration numbers, and 'review fixes' is broad. It still describes real, central parts of the change.
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A rabbit checks the lane-row line, Then waits its turn, in ordered time. Claims release when waits grow long, A final try completes the song. The test logs count each job anew, And hops to green when checks pass through.
psycopg 3.3.9 has no Python 3.15 binary wheel yet, so installing psycopg
and psycopg-binary separately paired psycopg 3.3.9 with psycopg-binary
3.3.8, which fails to import. The extra pins matching versions.
The rest shard took 13 to 17 minutes on recent runs, most of it in
bulk_rescue_test, and a slow runner reached the 20-minute limit while every
test that ran had passed.
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Actionable comments posted: 3
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @awa-model/src/queue_storage.rs:
- Line 5214: Update provision_lane and the ensure_lane_inserts path to acquire
the queue_lanes row before taking the lane advisory lock, keeping the lock order
consistent in the installed function and application path. Add coverage for a
direct provision_lane call racing with QueueStorage and verify the race
completes without a deadlock.
Review comments at @awa/tests/insert_many_batch_test.rs:
- Line 1141: Update the producer-task join loop around `task.await` to detect
failures as tasks complete rather than awaiting task 0 first; on failure, abort
the remaining producers so they cannot remain blocked at `barrier.wait()` and
hold `ENGINE_GUARD`. Alternatively, enforce a deadline for the entire producer
group and ensure cleanup releases the guard.
- Around line 1509-1511: Update the timing assertion and its docstring in the
test around the elapsed check so they measure the same behavior: either expose
and assert that pre-lane work alone exceeds lock_timeout, or narrow both to
describe and verify only the total-duration property. Preserve the existing
lane-wait behavior and avoid claiming coverage the measurement does not
establish.
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…e lock
The installed provision_lane function took the lane's advisory lock and then
inserted its queue_lanes row, the reverse of the order producers and
QueueStorage use, so a direct call and a producer that were both first to
use a lane could deadlock. Migration v058 reinstalls it with the row first.
…pre-lane work
The mixed-producer test joins tasks as they finish and aborts the rest on a
failure, so producers left at the barrier cannot hang the suite. The
lock_timeout test asserts on the time until the batch waits for the lane,
which is the work its docstring describes.
The lock_timeout test reads how long the batch statement ran before it began
waiting for the lane from pg_locks.waitstart and the statement's query_start,
so task scheduling and polling delay no longer count toward it.
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Second step of bringing 0.6.16 and 0.6.17 to
main, after #725.Ported
awa.insert_jobs_compat_batchtakes its claims and lanes in a subtransaction with bounded lock waits, rolls back and retries after a short randomised pause, and makes one final attempt with ordinary waits after 2 s. Same lock budget, retry timing and caught SQLSTATEs as the 0.6 schema patch.queue_lanesrow is written before its provisioning lock, with the TLA+ witness for the old order (AwaStorageLockOrderOldLaneProvisioningDeadlock.cfg) registered in the suite.job_idsGIN index, tests for the batch function's failing unique-conflict mode and the lane contention benchmark's row counts, and the docs say a batch insert holds a lane's enqueue lock until its transaction ends.Migrations
awaor queue-storage table. A database coming from 0.6.16 or later already has both bodies from its schema patches.docs/upgrade-0.6-to-0.7.md, andCURRENT_VERSIONis 57.brian/enqueue-fold,brian/admin-operations-redesign,ccr-37ca53f6-xza211-land-570) will need renumbering when they land.Verification
cargo fmtand workspace clippy with-D warningsare clean.unnestwithout an explicitORDER BY, as on 0.6.MAPPING.md) and an upgrade rehearsal from a 0.6.17 database. CI covers both.Generated by Claude Code
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