[FLINK-38544][checkpoint] Support spilling for checkpointing during recovery#28517

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1996fanrui:38544-spilling-v2/pr

Commits on Jun 23, 2026

[FLINK-38544][network] Decouple LocalInputChannel recovery wiring from toBeConsumedBuffers
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[FLINK-38544][network] Phase 1: common interfaces & sentinels for spilling v2
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[FLINK-38544][network] Phase 2: InputChannel side push-based recovery
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[FLINK-38544][checkpoint] Phase 3: SpillFile + filter writer phase
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[FLINK-38544][checkpoint] Phase 4: spill reader drain + heap fallback removal
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[FLINK-38544][checkpoint] Phase 5: checkpoint 3-step coordination
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Commits on Jun 24, 2026

!fixup: [FLINK-38544][checkpoint] short-circuit snapshot once recovery fully consumed
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