[FLINK-40211][checkpoint] Add Regional Checkpoint metrics, REST API and Web UI support - #28965
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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)
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…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)
…ST API fields - Rename metric to regional_checkpoint_count (snake_case) and change from Gauge to Counter - Add ref_checkpoint_id to CompletedSubtaskCheckpointStatistics - Add oldest_ref_checkpoint_id to TaskCheckpointStatistics and CheckpointStatistics (cross-subtask/task min aggregation) - Add regional_checkpoint_enabled, regional_max_failure_ratio, regional_max_consecutive_failures to CheckpointConfigInfo - Wire data channel: OperatorSubtaskState.refCheckpointId -> SubtaskStateStats -> TaskStateStats -> CheckpointStatistics - Regenerate REST API snapshot Generated-by: CodeBuddy Code (GLM-5.2)
- Display Regional Checkpoint configuration in checkpoint config page - Display ref_checkpoint_id per subtask in checkpoint detail page - Add oldest_ref_checkpoint_id column in checkpoint statistics Generated-by: CodeBuddy Code (GLM-5.2)
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Purpose
Adds observability for Regional Checkpoint (FLIP-600 Phase 7-9): metrics, REST API fields, and Web UI display.
Changes
Commit 1: Metrics and REST API
regional_checkpoint_count(snake_case) and change from Gauge to Counterref_checkpoint_idto CompletedSubtaskCheckpointStatisticsoldest_ref_checkpoint_idto TaskCheckpointStatistics and CheckpointStatistics (cross-subtask/task min aggregation)regional_checkpoint_enabled,regional_max_failure_ratio,regional_max_consecutive_failuresto CheckpointConfigInfoCommit 2: Web UI
ref_checkpoint_idper subtask in checkpoint detail pageoldest_ref_checkpoint_idcolumn in checkpoint statisticsTesting
Dependencies
Generated-by: CodeBuddy Code (GLM-5.2)