[FLINK-40209][checkpoint] Introduce Regional Checkpoint core mechanism and notification dispatch - #28963
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…iguration and refCheckpointId infrastructure - Add CheckpointListener.notifyRegionalCheckpointComplete(long, RegionalCheckpointInfo) for healthy-region tasks - Add CheckpointListener.notifyRegionalCheckpointFallback(long, long) for failed-region tasks - Add RegionalCheckpointInfo class with fallback checkpoint subtask mapping - Add OperatorCoordinator.supportsRegionCheckpoint() and checkpointCoordinatorForRegionFallback() - Wire OperatorCoordinatorCheckpointContext and OperatorCoordinatorHolder for forwarding - Add 3 config options: region.enabled, region.max-failure-ratio, region.max-consecutive-failures - Add refCheckpointId field to OperatorSubtaskState for tracking historical state references - Add MetadataV7Serializer for backward-compatible serialization of refCheckpointId - Add refCheckpointId to SubtaskStateStats/TaskStateStats for REST API aggregation - Add CheckpointSubsumeHelper for reference-aware checkpoint cleanup - Add regional config fields to CheckpointCoordinatorConfiguration Generated-by: CodeBuddy Code (GLM-5.2)
…d SourceCoordinator fallback - Add RegionalCheckpointHandler: decline buffering, region failure judgment, state recombination, two-tier max-consecutive-failures (Tier 1: force next global; Tier 2: abort + reset) - Wire CheckpointCoordinator to delegate regional checkpoint logic to RegionalCheckpointHandler - Add PendingCheckpoint methods: recordDecline, areAllTasksResponded, markUnacknowledgedTasksAsDeclined, reportFallbackSubtaskStats, finalizeRegionalCheckpoint - Add DefaultCompletedCheckpointStore.computeReferencedCheckpointIds for cleaner reference protection - Implement SourceCoordinator.supportsRegionCheckpoint() and checkpointCoordinatorForRegionFallback() - Implement SplitAssignmentTracker per-checkpoint assignment history with backward-compatible serialization - Wire Regional Checkpoint config through StreamGraph - Add unit tests: success path, consecutive limit, state assembly, deferred abort, cleaner, config Generated-by: CodeBuddy Code (GLM-5.2)
…dispatch and local state cleanup - Extend confirmCheckpoint RPC with fallbackCheckpointId parameter (reuses task-side checkpoint-complete RPC path so notification survives task restarts) - Add Task.notifyRegionalCheckpointFallback + CheckpointableTask.notifyRegionalCheckpointFallbackAsync - Implement StreamTask.notifyRegionalCheckpointFallbackAsync with SubtaskCheckpointCoordinator - Add SubtaskCheckpointCoordinator.notifyRegionalCheckpointFallback + OperatorChain propagation - Add AbstractUdfStreamOperator forwarding to user functions - Add TaskStateManager.pruneStateForCheckpoint for local state cleanup (FLIP-600 Section 9) - TaskExecutor.confirmCheckpoint dispatches to notifyRegionalCheckpointFallback or notifyCheckpointComplete Generated-by: CodeBuddy Code (GLM-5.2)
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Purpose
Implements the core Regional Checkpoint mechanism (FLIP-600 Phase 1-5): when partial pipeline regions fail during a checkpoint, the framework generates a logically complete Completed Checkpoint by combining historical state of failed regions with current state of healthy regions.
Changes
Commit 1: Define interfaces, configuration and refCheckpointId infrastructure
notifyRegionalCheckpointComplete(healthy-region tasks) andnotifyRegionalCheckpointFallback(failed-region tasks)supportsRegionCheckpoint()andcheckpointCoordinatorForRegionFallback()region.enabled,region.max-failure-ratio,region.max-consecutive-failuresrefCheckpointIdfield to OperatorSubtaskState + MetadataV7Serializer (backward-compatible)Commit 2: Implement core logic and SourceCoordinator fallback
Commit 3: Implement notification dispatch and local state cleanup
fallbackCheckpointIdparameter (reuses task-side checkpoint-complete RPC path so notification survives task restarts)Testing
Dependencies
Generated-by: CodeBuddy Code (GLM-5.2)