[vpj] Snapshot-at-T: new VPJ mode (rewind knobs + offline RT merge) by sixpluszero · Pull Request #2851 · linkedin/venice

sixpluszero · 2026-06-10T08:03:45Z

Problem Statement

A full (BATCH) push to a hybrid store is not servable when the batch data finishes loading. After End-Of-Push, the new version replays the real-time topic from (SOP or EOP) - rewindTimeInSeconds up to the live tail before it can go online. For stores with a multi-day rewind, this replay dominates the push wall-clock and sits on the version-readiness critical path. On a representative A/A + write-compute store with a ~3-day rewind, the rewind measured at ~7 hours, ~84% of each push's wall-clock (two pushes × three fabrics).

A push that fixes a cutoff timestamp T and ships a batch dataset already current as of T would only need to rewind the short [T, now] tail. This PR adds the per-VPJ control knobs for that rewind-shortening. The offline merge that produces the combined dataset is a follow-up (see Solution).

Solution

Adds per-push-job knobs that, for a hybrid full push, set the existing rewindTimeInSecondsOverride to (now - T) + buffer (reusing the controller's handleRewindTimeOverride path and REWIND_FROM_SOP semantics), gated by a threshold so it only triggers when the store's effective rewind is large enough to be worth it.

The gate (maybeApplySnapshotAtTRewindOverride) is skipped for incremental/KIF-repush jobs, non-hybrid stores, when an explicit rewind override is already set, or when the store's effective rewind is below the threshold.

Shortening the rewind is correct only when the batch dataset already incorporates real-time data up to T. The master flag defaults off and must remain off in production until the merge below is wired end to end, otherwise the shortened rewind would skip nearline writes between the offline cutoff and T (a data gap).

Data plane: offline RT-to-batch merge core

SnapshotAtTRecordMerger is the correctness core that produces the merged dataset the shortened rewind relies on. It folds RT PUT/UPDATE/DELETE records onto the batch base by reusing the server's own MergeConflictResolver (da-vinci-client is already a venice-push-job dependency), and emits the merged value and its RMD, so the offline result equals what a server produces by replaying the same RT during rewind, including Active-Active field-level timestamps and write-compute partial updates. seedFromBatch establishes the batch-sentinel RMD (timestamp 0) exactly as a server stores batch data, so any real RT write folded in afterwards wins. Values are held as byte[] so a ByteBuffer position the resolver advances while reading inputs cannot corrupt a later operation.

The data plane is built around this engine:

SnapshotAtTRtReader reads a region's RT topic from start to the current tail and normalizes each PUT/UPDATE/DELETE, tagging it with the region's colo id (so the merger does cross-region conflict resolution). Bytes are copied out of the consumed message immediately, since pooled consumer buffers are reused across polls.
SnapshotAtTPushExecutor seeds the merger from the batch value per key, folds in all regions' RT records, and writes the merged value+RMD (or an RMD-carrying delete) via a VeniceWriter, which partitions each key itself.

This is wired into VenicePushJob.run() as a first-class mode: when the gate triggers, the job verifies the store is hybrid + Active-Active, reads the offline batch input in-process, reads each region's RT (per snapshot.at.t.rt.region.brokers), merges, compresses to the version's compression strategy, and produces the merged version through a single writer that owns SOP+data+EOP (so Data-Integrity-Validation stays consistent; the controller skips SOP for this mode). SnapshotAtTSchemaRepository supplies the store's real value/RMD/derived schemas to the merge. So a single VenicePushJob run performs the whole new-mode push, for NO_OP and ZSTD_WITH_DICT stores alike.

The remaining productionization is auto-discovering the per-region RT brokers from the controller's Active-Active source-fabric config (today they're passed via snapshot.at.t.rt.region.brokers).

Code changes

Added new code behind a config. Configs and defaults:
- snapshot.at.t.rewind.enabled (boolean, default false) — master switch
- snapshot.at.t.min.rewind.threshold.seconds (long, default 1 day = 86400) — skip when the store's effective rewind is below this
- snapshot.at.t.cutoff.epoch.seconds (long, default = start of push) — the cutoff T
- snapshot.at.t.rewind.buffer.seconds (long, default 60) — gap-safety buffer
Introduced new log lines. Info-level, one per push decision (job setup, not a hot path), so no rate limiting needed.

Concurrency-Specific Checks

No race conditions: the gate is a pure function over a single push job's PushJobSetting, run once during job setup; no shared mutable state.
No new synchronization, blocking calls, shared collections, or multi-threaded code is introduced.

How was this PR tested?

New unit tests (control plane): gate applied (default cutoff and explicit past cutoff), threshold boundary, below-threshold skip, ineligible jobs (disabled / non-hybrid / incremental / repush / explicit-override), future-cutoff rejection.
New unit tests (merge core): value-level PUT (batch sentinel, RT write wins, stale write ignored), DELETE tombstone carrying RMD, and write-compute field-level partial update asserting the per-field RMD timestamp.
New integration test (control plane): testSnapshotAtTRewindOverrideReachesControllerRequest exercises config → gate → createNewStoreVersion and asserts the shortened rewind reaches requestTopicForWrites.
New integration tests (2-region A/A cluster), both passing (~48s each): SnapshotAtTPushIntegrationTest produces RT to two regions with logical timestamps (including a cross-region conflict key) and asserts every key's served value in both regions equals the correct merged result —
- testSnapshotAtTMergeAcrossTwoRegions drives the data plane directly (request short-rewind version → read both regions' RT → merge → produce value+RMD → SOP/EOP);
- testSnapshotAtTViaVenicePushJob drives it through a single VenicePushJob run with snapshot.at.t.enabled=true and a 0s threshold (so the mode triggers on the store's 3600s rewind) plus a batch Avro input.
Ran locally — all pass: ./gradlew :clients:venice-push-job:test --tests "*VenicePushJobTest" --tests "*SnapshotAtTRecordMergerTest" and ./gradlew :internal:venice-test-common:integrationTest --tests "*SnapshotAtTPushIntegrationTest".

Does this PR introduce any user-facing or breaking changes?

No. The new behavior is entirely behind snapshot.at.t.rewind.enabled, which defaults to false; existing pushes are unchanged.

Adds per-push-job knobs that let a hybrid full push ship a shortened rewind window ([T, now]) instead of the store's full configured rewind, gated by a threshold so it only triggers when the store's effective rewind is large enough to be worth it. New configs (VenicePushJobConstants): - snapshot.at.t.rewind.enabled (master switch, default false) - snapshot.at.t.min.rewind.threshold.seconds (skip when the store's effective rewind is below this; default 1 day) - snapshot.at.t.cutoff.epoch.seconds (the cutoff T; default = start of push) - snapshot.at.t.rewind.buffer.seconds (gap-safety buffer; default 60) The gate (maybeApplySnapshotAtTRewindOverride) sets the existing rewindTimeInSecondsOverride to (now - T) + buffer and requires REWIND_FROM_SOP, reusing the controller's handleRewindTimeOverride path. It is skipped for incremental/KIF-repush jobs, non-hybrid stores, when an explicit rewind override is already set, or when the effective rewind is below the threshold. Control plane only: shortening the rewind is correct only when the batch dataset already incorporates real-time data up to T (the offline merge data plane, follow-up). The master flag defaults off and must remain off in production until that data plane lands, otherwise the shortened rewind would skip nearline writes between the offline cutoff and T (a data gap). Tests: unit coverage for the gate (applied / below-threshold / boundary / ineligible jobs / future-cutoff) plus an integration test asserting the shortened rewind reaches the controller's requestTopicForWrites. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…th RMD The snapshot-at-T data plane's correctness core. Folds real-time PUT/UPDATE/DELETE records onto a batch base value by reusing the server's own MergeConflictResolver (da-vinci-client), and emits the merged value AND its Replication Metadata (RMD) so the merged result is identical to what a server produces by replaying the same RT during a hybrid rewind. - seedFromBatch establishes the batch-sentinel RMD (timestamp 0) exactly as a server stores batch data, so any real RT write folded in afterwards wins. - applyPut/applyUpdate/applyDelete fold RT records via the resolver; finalizeRecord emits (value, serialized RMD, valueSchemaId, rmdProtocolVersion, isDelete). - Handles value-level and field-level (write-compute / partial-update) RMD; the rmdUseFieldLevelTimestamp flag must match the store config. - Value is stored as byte[] (position-safe) so the resolver advancing a ByteBuffer's position while reading inputs cannot corrupt a later operation. This is the merge engine only; wiring it into the multi-region RT reader + reducer + writer pipeline is the remaining data-plane integration. Tests: value-level PUT (sentinel -> RT-wins -> stale-ignored), DELETE tombstone with RMD, and write-compute field-level partial update (per-field RMD timestamp). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

merge-and-produce executor, 2-region A/A integration test Adds the data-plane components that produce the snapshot-at-T merged version, plus an end-to-end multi-region integration test proving correctness. - SnapshotAtTRtReader: reads a region's RT topic from start to the current tail (bounded by the start->end record count, with optional event-time cutoff), normalizing each PUT/UPDATE/ DELETE for the merge and tagging it with the region's colo id. Bytes are copied out of the consumed message immediately so a pooled consumer buffer cannot corrupt a record processed later. - SnapshotAtTRtRecord: normalized RT record (op, key, payload, value/update schema ids, write timestamp, colo id). - SnapshotAtTPushExecutor: per key, seeds the merger from the batch value, folds all regions' RT records, and writes the merged value+RMD (or an RMD-carrying delete) via a VeniceWriter, which partitions each key itself. - SnapshotAtTPushIntegrationTest (2-region A/A cluster): produces RT to BOTH regions with logical timestamps (including a cross-region conflict key), runs the new-mode push (request a version with a short rewind override -> read both regions' RT -> merge -> produce value+RMD -> SOP/EOP), and asserts every key's served value in both regions equals the correct merged result (region 1's newer write wins the conflict key). Wiring this data path into VenicePushJob.run() as a first-class mode (in-process batch read + region-broker discovery) is the remaining productionization; the merge correctness and multi-region read are fully validated here. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…command, end to end) When the snapshot-at-T gate triggers, VenicePushJob.run() now produces the merged version itself instead of the data-writer job: it reads the offline batch input in-process, reads each region's RT (per snapshot.at.t.rt.region.brokers) up to the cutoff, merges per key (value+RMD) via SnapshotAtTRecordMerger, and produces the result through a single writer that owns SOP+data+EOP (so Data-Integrity-Validation stays consistent; the controller skips SOP for this mode). - New config snapshot.at.t.rt.region.brokers ("coloId=broker;..." per region). - SnapshotAtTSchemaRepository: a minimal ReadOnlySchemaRepository built from the controller's value / RMD / derived schemas, so the merge runs with the store's real schemas. - Batch input read via VeniceAvroFileIterator; version data written via a byte[] VeniceWriter with the store partitioner + chunking. Integration test testSnapshotAtTViaVenicePushJob: a single VenicePushJob run with snapshot.at.t.enabled=true and a 0s threshold (so the mode triggers on the store's 3600s rewind) produces RT to two regions, merges with the batch Avro input, and serves the correct merged result in both regions. Passes. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…, fix CI (spotbugs + coverage) - Fail fast in the snapshot-at-T mode unless the store is hybrid AND Active-Active enabled, rather than relying on auto-discovery of the RT topology. - Compress merged values to the version's compression strategy before producing, and carry the dictionary in the Start-Of-Push, so ZSTD_WITH_DICT stores work. The single-command VPJ integration test now runs for both NO_OP and ZSTD_WITH_DICT. - Remove an unused field flagged by SpotBugs (StaticAnalysis check). - Add unit tests for SnapshotAtTPushExecutor, SnapshotAtTSchemaRepository, and the region-broker config parser to satisfy diff-coverage. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…isolate the merge The test set a 0s threshold so the mode triggers, but it did not prove it did: a normal push to this hybrid A/A store would, via the server's 3600s rewind, merge the same RT and serve the same values, and the short rewind could even re-apply the RT and mask a broken merge. Now: - Assert v2's rewind was overridden to the short snapshot window (well below the store's 3600s), which only happens when the snapshot-at-T gate fires and the snapshot data path runs. - Age the RT past that short rewind window before the push, so the served data reflects only the offline merge and is not silently fixed up by the server's post-EOP rewind. A broken merge (RT not folded in) now fails the test instead of passing. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…test shard New integration tests land in the catch-all IntegrationTests_99 bucket until the next automated rebalance. That bucket was already near its 15-minute job timeout from other unassigned tests, so adding this ~3-minute class tipped it over: the class itself passed (suite SUCCESS in ~200s), but the bucket was then cancelled at the timeout. Move it to a dedicated shard (86) so bucket 99 stays under the timeout and the test runs with headroom. A later rebalance_test_shards.py run (with CI timing) will fold it in optimally. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

This PR introduces a new “snapshot-at-T” Venice Push Job (VPJ) mode intended to shorten hybrid store rewind time by (1) applying per-push rewind override knobs and (2) optionally performing an offline RT→batch merge that produces value + RMD so the version can come online after replaying only a short tail.

Changes:

Added per-VPJ config knobs and gating logic to apply a rewind-time override for hybrid full pushes (“snapshot-at-T” rewind shortening).
Added snapshot-at-T data-plane implementation: read batch input + read RT from multiple regions + merge via server MergeConflictResolver + write merged value+RMD with SOP/EOP.
Added unit/integration tests and CI sharding to cover the new mode.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
internal/venice-test-common/test-shard-assignments.json	Adds new integration test shard assignment for snapshot-at-T integration tests.
internal/venice-test-common/src/integrationTest/java/com/linkedin/venice/snapshot/SnapshotAtTPushIntegrationTest.java	New multi-region end-to-end integration tests for snapshot-at-T merge + shortened rewind.
clients/venice-push-job/src/test/java/com/linkedin/venice/hadoop/VenicePushJobTest.java	Adds unit/integration-style tests for the rewind override gate and parsing region brokers.
clients/venice-push-job/src/test/java/com/linkedin/venice/hadoop/snapshot/SnapshotAtTSchemaRepositoryTest.java	New unit tests for the controller-backed schema repository used by the merge path.
clients/venice-push-job/src/test/java/com/linkedin/venice/hadoop/snapshot/SnapshotAtTRecordMergerTest.java	New unit tests for merge correctness (PUT/DELETE/update + RMD assertions).
clients/venice-push-job/src/test/java/com/linkedin/venice/hadoop/snapshot/SnapshotAtTPushExecutorTest.java	New unit tests for executing the merge and producing puts/deletes.
clients/venice-push-job/src/main/java/com/linkedin/venice/vpj/VenicePushJobConstants.java	Adds snapshot-at-T config keys + defaults and documents behavior.
clients/venice-push-job/src/main/java/com/linkedin/venice/hadoop/VenicePushJob.java	Implements gate + controller request wiring + snapshot-at-T merge push execution path.
clients/venice-push-job/src/main/java/com/linkedin/venice/hadoop/snapshot/SnapshotAtTSchemaRepository.java	New minimal schema repository loaded from controller responses for merge resolver usage.
clients/venice-push-job/src/main/java/com/linkedin/venice/hadoop/snapshot/SnapshotAtTRtRecord.java	New RT record normalization container used by reader/merger/executor.
clients/venice-push-job/src/main/java/com/linkedin/venice/hadoop/snapshot/SnapshotAtTRtReader.java	New RT reader that deterministically reads partition ranges and normalizes RT messages.
clients/venice-push-job/src/main/java/com/linkedin/venice/hadoop/snapshot/SnapshotAtTRecordMerger.java	New offline merge core using MergeConflictResolver to produce merged value + RMD.
clients/venice-push-job/src/main/java/com/linkedin/venice/hadoop/snapshot/SnapshotAtTPushExecutor.java	New executor that merges per key and writes merged records (put/delete with RMD).
clients/venice-push-job/src/main/java/com/linkedin/venice/hadoop/PushJobSetting.java	Adds snapshot-at-T settings fields to PushJobSetting.
.github/workflows/VeniceCI-E2ETests.yml	Adds a new integration test shard job (86) and wires it into the failure aggregation job.

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sixpluszero · 2026-06-18T23:19:32Z

+    Map<ByteBuffer, ByteBuffer> batchValues = readBatchInputForSnapshot();
+    String realTimeTopicName = Utils.getRealTimeTopicName(storeInfo);
+    long cutoffMs = setting.snapshotAtTCutoffEpochSeconds > 0 ? setting.snapshotAtTCutoffEpochSeconds * 1000 : 0L;
+    SnapshotAtTRtReader rtReader = new SnapshotAtTRtReader();
+    List<SnapshotAtTRtRecord> rtRecords = new ArrayList<>();
+    for (Map.Entry<Integer, String> region: setting.snapshotAtTRtRegionBrokers.entrySet()) {
+      rtRecords.addAll(
+          rtReader.readRegion(
+              snapshotConsumerProps(region.getValue()),


Acknowledged — this is a known scalability limitation of the current single-process merge, tracked as a follow-up. Plan: make the merge distributed — read the batch (HDFS) and per-region RT as input splits (reusing the KafkaInput/KIF infrastructure), shuffle by key, and cogroup batch+RT per key through the same SnapshotAtTRecordMerger in reducers (memory bounded per partition, spillable), writing out via the existing partitioned VeniceWriter. Until that lands, the master flag snapshot.at.t.rewind.enabled stays off by default, so this path does not run in production.

… address review Fixes correctness gaps in the snapshot-at-T offline merge and addresses the Copilot review comments on linkedin#2851. - sepRT: the offline merge now reads BOTH the regular RT and the separate RT topic per region (mirroring the server, which subscribes to both during a hybrid rewind), so separate-RT / incremental-push writes are no longer dropped. Adds snapshotAtTRtTopicNames() + unit test. - Rewind correctness (review #5): stamp the snapshot-at-T Start-Of-Push with the job start time so the server's REWIND_FROM_SOP rewind start is pinned to (cutoff - buffer) regardless of how long the offline merge takes, instead of drifting past the snapshot's coverage on a long merge and silently dropping the real-time writes in the gap. Adds a sentinel-guarded broadcastStartOfPush overload to VeniceWriter that carries a caller-supplied SOP messageTimestamp (existing callers keep using the writer clock). - Review robustness fixes: - readBatchInputForSnapshot skips null (delete-marker) batch values instead of NPE-ing. - parseSnapshotAtTRegionBrokers rejects duplicate coloId and empty broker. - SnapshotAtTSchemaRepository fails fast on empty value schemas and on RMD / derived schema fetch errors. - SnapshotAtTRtReader aborts on an incomplete RT read (no silent data loss) and skips a not-yet-created separate RT topic. - Tests: cross-colo out-of-order PUT/UPDATE/DELETE order-independence; SOP timestamp carried + rewind-start pinned at/before cutoff; schema-repo failure cases; region-broker parse validation. linkedin#6 (the in-memory batch+RT merge is not yet streaming/distributed) remains a tracked follow-up; the master flag snapshot.at.t.rewind.enabled stays off by default until that data plane lands. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…ata path The snapshot-at-T SOP-timestamp change (f7d95ab) moved the envelope-building body into a new 7-arg getKafkaMessageEnvelope and rewired the data/control send path to call it directly. That bypassed any subclass override of the public 6-arg getKafkaMessageEnvelope, breaking ConsumerIntegrationTest forward-compatibility: VeniceWriterWithNewerProtocol overrides the 6-arg method to emit a newer-protocol envelope, and with the override skipped it silently degraded to a normal writer ("expected value2 but found value1"). The tests passed on the prior commit e48990f and on main, confirming this is a regression from f7d95ab. Reverse the delegation: the overridable 6-arg method keeps the body; the 7-arg method builds via it (so subclass overrides fire on every send path) and only pins the producer messageTimestamp when a caller supplied a non-sentinel value. Adds a unit regression test asserting a subclass's 6-arg override is invoked on the put() path. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Pull request overview

Copilot reviewed 17 out of 17 changed files in this pull request and generated 3 comments.

+    long nowSeconds = setting.jobStartTimeMs / 1000;
+    long cutoffEpochSeconds =
+        setting.snapshotAtTCutoffEpochSeconds == NOT_SET ? nowSeconds : setting.snapshotAtTCutoffEpochSeconds;
+    if (cutoffEpochSeconds > nowSeconds) {
+      throw new VeniceException(
+          String.format(
+              "Provided '%d' for %s; the snapshot-at-T cutoff cannot be a timestamp in the future (now=%ds).",
+              cutoffEpochSeconds,
+              SNAPSHOT_AT_T_CUTOFF_EPOCH_SECONDS,
+              nowSeconds));
+    }
+    long finalRewindSeconds = (nowSeconds - cutoffEpochSeconds) + setting.snapshotAtTRewindBufferSeconds;
+    setting.rewindTimeInSecondsOverride = finalRewindSeconds;


+    List<String> realTimeTopicNames = snapshotAtTRtTopicNames(storeInfo);
+    long cutoffMs = setting.snapshotAtTCutoffEpochSeconds > 0 ? setting.snapshotAtTCutoffEpochSeconds * 1000 : 0L;
+    SnapshotAtTRtReader rtReader = new SnapshotAtTRtReader();


+      int coloId = Integer.parseInt(trimmed.substring(0, separator).trim());
+      String brokerAddress = trimmed.substring(separator + 1).trim();


sixpluszero and others added 2 commits June 10, 2026 01:01

sixpluszero changed the title ~~[vpj] Add per-VPJ snapshot-at-T rewind-shortening config knobs~~ [vpj] Snapshot-at-T: rewind-shortening knobs + offline RT-merge core Jun 10, 2026

sixpluszero changed the title ~~[vpj] Snapshot-at-T: rewind-shortening knobs + offline RT-merge core~~ [vpj] Snapshot-at-T: rewind knobs + offline RT-merge data plane Jun 10, 2026

sixpluszero changed the title ~~[vpj] Snapshot-at-T: rewind knobs + offline RT-merge data plane~~ [vpj] Snapshot-at-T: new VPJ mode (rewind knobs + offline RT merge) Jun 10, 2026

sixpluszero and others added 3 commits June 10, 2026 11:35

sixpluszero marked this pull request as ready for review June 10, 2026 22:20

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[vpj] Snapshot-at-T: new VPJ mode (rewind knobs + offline RT merge)#2851

[vpj] Snapshot-at-T: new VPJ mode (rewind knobs + offline RT merge)#2851
sixpluszero wants to merge 9 commits into
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sixpluszero:snapshot-at-t-rewind-config-knobs

sixpluszero commented Jun 10, 2026 •

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		int coloId = Integer.parseInt(trimmed.substring(0, separator).trim());
		String brokerAddress = trimmed.substring(separator + 1).trim();

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sixpluszero commented Jun 10, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Problem Statement

Solution

Data plane: offline RT-to-batch merge core

Code changes

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Does this PR introduce any user-facing or breaking changes?

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sixpluszero commented Jun 10, 2026 •

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