Add distributed ingestion coordinator for v1.8.0#4309
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Add distributed ingestion coordinator for v1.8.0#4309
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Co-authored-by: makr-code <150588092+makr-code@users.noreply.github.com>
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…E_ENHANCEMENTS Co-authored-by: makr-code <150588092+makr-code@users.noreply.github.com>
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Completed in 962b4cb. The remaining PR items are now done:
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[WIP] Add distributed ingestion coordinator for v1.8.0
Add distributed ingestion coordinator for v1.8.0
Mar 17, 2026
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Pull request overview
Adds a pluggable shared checkpoint store to the distributed ingestion coordinator, commits per-source completion checkpoints after ingestion, and introduces corresponding unit + opt-in perf microbench tests. Also adds initial gRPC proto definitions and CI workflow coverage for the coordinator surface area.
Changes:
- Introduce
ISharedCheckpointStore+InMemorySharedCheckpointStore, and wire a default store intoIngestionCoordinator. - Persist a per-source completion checkpoint after successful ingestion; add unit tests and opt-in perf tests (gated by
THEMIS_RUN_PERF_TESTS=1). - Add
proto/ingestion_coordinator.proto, a dedicated CI workflow, and mark the related FUTURE_ENHANCEMENTS item as implemented.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 9 comments.
Show a summary per file
| File | Description |
|---|---|
include/ingestion/ingestion_coordinator.h |
Adds shared checkpoint store interface/implementation and coordinator injection/access APIs. |
src/ingestion/ingestion_coordinator.cpp |
Implements in-memory store, initializes default store, and writes completion checkpoints in ingestAll(). |
tests/test_ingestion_coordinator.cpp |
Adds unit tests for the store and coordinator integration, plus opt-in perf microbenchmarks. |
proto/ingestion_coordinator.proto |
Adds initial gRPC service + message definitions for coordinator↔worker communication. |
.github/workflows/distributed-ingestion-coordinator-ci.yml |
Adds focused CI workflow to build and run coordinator tests when related files change. |
src/ingestion/FUTURE_ENHANCEMENTS.md |
Updates status/checkboxes to indicate the feature and perf targets are implemented. |
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| IngestionCheckpoint cp; | ||
| cp.source_id = src.source_id; | ||
| cp.cursor = kCompletedCursor; | ||
| checkpoint_store_->write(cp); |
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| void IngestionCoordinator::setSharedCheckpointStoreForTesting( | ||
| std::shared_ptr<ISharedCheckpointStore> store) | ||
| { |
tests/test_ingestion_coordinator.cpp
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| RecordProperty("elapsed_1_worker_s", elapsed_1w); | ||
| RecordProperty("elapsed_4_workers_s", elapsed_4w); | ||
| RecordProperty("speedup_ratio", speedup); |
tests/test_ingestion_coordinator.cpp
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| constexpr size_t kSources = 400; // sources per run | ||
| constexpr size_t kDocsPerSource = 1000; // documents each mock worker reports | ||
| constexpr double kMinSpeedup = 3.5; // required throughput ratio |
tests/test_ingestion_coordinator.cpp
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| RecordProperty("wall_clock_s", wall_clock); | ||
| RecordProperty("total_worker_time_s", total_worker_time); | ||
| RecordProperty("max_worker_time_s", max_worker_time); | ||
| RecordProperty("overhead_fraction", overhead_fraction); |
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| /// Returns true when THEMIS_RUN_PERF_TESTS=1 is set in the environment. | ||
| inline bool perfTestsEnabled() { | ||
| const char* v = std::getenv("THEMIS_RUN_PERF_TESTS"); | ||
| return v && std::string(v) == "1"; |
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| // Write a checkpoint only when there were no failures for this source | ||
| // (i.e. documents_processed > 0 and no errors). | ||
| auto it = final_report.source_stats.find(src.source_id); | ||
| if (it != final_report.source_stats.end() && | ||
| it->second.documents_processed > 0 && | ||
| it->second.errors.empty()) { | ||
| IngestionCheckpoint cp; | ||
| cp.source_id = src.source_id; | ||
| cp.cursor = kCompletedCursor; |
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| // Submit a set of sources to this worker for ingestion. | ||
| // The server streams zero or more ProgressEvent messages during processing, | ||
| // followed by a single IngestResponse when all assigned sources are done. | ||
| rpc IngestSources(IngestRequest) returns (stream ProgressEvent); | ||
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| // Retrieve the final aggregated IngestResponse for a previously submitted | ||
| // job. Useful for polling models where the client reconnects after a | ||
| // transient disconnection. | ||
| rpc GetIngestResult(GetIngestResultRequest) returns (IngestResponse); | ||
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| /** | ||
| * @brief Inject a custom shared checkpoint store (testing / simulation only). | ||
| * | ||
| * In production the coordinator uses an `InMemorySharedCheckpointStore` | ||
| * (suitable for single-process deployments). Multi-host deployments | ||
| * provide a Redis- or database-backed implementation here. | ||
| * | ||
| * Must be called before `start()`. | ||
| */ | ||
| void setSharedCheckpointStoreForTesting( | ||
| std::shared_ptr<ISharedCheckpointStore> store); |
Owner
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@copilot fix it |
Co-authored-by: makr-code <150588092+makr-code@users.noreply.github.com>
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All 9 review comments addressed in b04a231:
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Description
Implements the Distributed Ingestion Coordinator roadmap item for v1.8.0. Enables
IngestionManagerto distribute source processing across multiple ThemisDB nodes so that large ingestion jobs are not bottlenecked on a single instance.Changes
proto/ingestion_coordinator.proto— gRPC proto definition withIngestRequest,IngestResponse,ProgressEvent, andIngestionWorkerService; fixed RPC comment onIngestSources()to accurately reflect that final results are retrieved viaGetIngestResult()(not inlined in the stream)include/ingestion/ingestion_coordinator.h— AddedISharedCheckpointStoreinterface andInMemorySharedCheckpointStore(thread-safe in-memory implementation); added production-facingsetSharedCheckpointStore()in a dedicated "Checkpoint store configuration" section;setSharedCheckpointStoreForTesting()is now a clearly-documented test-only alias that delegates tosetSharedCheckpointStore(); addedgetSharedCheckpointStore()src/ingestion/ingestion_coordinator.cpp—setSharedCheckpointStore()throwsstd::logic_errorif called while the coordinator is running (enforces "before start()" contract);setSharedCheckpointStoreForTesting()inherits the same guard via delegation; checkpoint write return value is now checked — failure surfaces as aWARNING INTERNAL_ERRORon the source's stats entry with actionable guidance; checkpoint is now written for all error-free sources (including 0-document / dry-run sources), andprocessed_countis populated fromIngestionStats::documents_processedtests/test_ingestion_coordinator.cpp— 61 tests total (+34 new):InMemorySharedCheckpointStoreTest(8 tests): write/read, missing key, exists, clear, overwrite, size, thread-safe concurrent writesIngestionCoordinatorCheckpointStoreTest(5 tests): default store is in-memory, injected store is used,SetStoreWhileRunningThrows(verifieslogic_errorfor both APIs), checkpoint written per source after ingest,CheckpointWrittenForZeroDocSourceIngestionCoordinatorPerfTest(2 tests,THEMIS_RUN_PERF_TESTS=1gated):TimedMockWorkerNodeuses the same per-source sleep;RecordPropertyvalues use integer types (ms, hundredths, basis points)#include <cstdlib>explicitly forstd::getenv;MockWorkerNodegainedsleep_us_per_source_field (default 0, no impact on existing tests)perfTestsEnabled()helper to avoid duplicated env-var check pattern.github/workflows/distributed-ingestion-coordinator-ci.yml— CI workflow targetingIngestionCoordinatorFocusedTests(gcc-12 / clang-15 / gcc-14 matrix)src/ingestion/FUTURE_ENHANCEMENTS.md— All Distributed Ingestion Coordinator items marked[x], section updated with✅ ImplementedType of Change
Testing
61 tests in
IngestionCoordinatorFocusedTests. Performance tests (AC-COORD-5, AC-COORD-6) are opt-in viaTHEMIS_RUN_PERF_TESTS=1to avoid CI flakiness on constrained hardware. Both perf tests use a deterministic 50 µs/source sleep to ensure wall-clock times are dominated by simulated work rather than scheduler noise.📚 Research & Knowledge (wenn applicable)
/docs/research/angelegt?/docs/research/implementation_influence/eingetragen?Relevante Quellen:
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