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https://issues.apache.org/jira/browse/FLINK-39523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-39523:
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Labels: pull-request-available (was: )
> Support checkpoint coordination during recovery via a recovery-checkpoint
> trigger (memory-based)
> ------------------------------------------------------------------------------------------------
>
> Key: FLINK-39523
> URL: https://issues.apache.org/jira/browse/FLINK-39523
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Checkpointing
> Reporter: Rui Fan
> Assignee: Rui Fan
> Priority: Major
> Labels: pull-request-available
>
> Complete the memory-based implementation of checkpointing during recovery.
> A new RecoveryCheckpointTrigger is dispatched by the barrier handlers at
> checkpoint start: it inserts a RecoveryCheckpointBarrier into every channel
> still in recovery, so checkpointStarted's in-recovery branch can persist
> exactly the pre-barrier recovered data (required even with all data already
> in the channel queues — a barrier arriving on an already-recovered channel
> fans checkpointStarted out to sibling channels still in recovery, which must
> find the marker or decline).
> Scope:
> * RecoveryCheckpointTrigger with NO_OP and NOT_READY (declines as
> CHECKPOINT_DECLINED_TASK_NOT_READY while filtering runs) plus a
> barrier-inserting in-memory implementation (the one-shot in-memory push
> leaves no undrained residue, so there is no snapshot to transfer).
> * ChannelState dispatches checkpoint start through a single hook (trigger
> step + per-input checkpointStarted); AlternatingCollectingBarriers /
> AlternatingWaitingForFirstBarrierUnaligned switch to it.
> * StreamTask trigger lifecycle: NOT_READY while filtering →
> barrier-inserting trigger during consumption → NO_OP once all gates report
> state consumed; all transitions on the mailbox thread.
> * Restore execution.checkpointing.during-recovery.enabled to ITCase
> randomization and re-enable the dedicated filtering ITCase — the randomized
> ITCase fleet now exercises the feature in ~50% of runs.
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