Rui Fan created FLINK-39520:
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Summary: Add spill file I/O and RecoveredBufferStore
Key: FLINK-39520
URL: https://issues.apache.org/jira/browse/FLINK-39520
Project: Flink
Issue Type: Sub-task
Reporter: Rui Fan
Assignee: Rui Fan
Introduces `SpillFileWriter` / `SpillFileReader` / `SpillEntry` for appending
and reading recovery data on disk, and `RecoveredBufferStore` (+
`RecoveredBufferStoreImpl`, `EmptyRecoveredBufferStore`) as the per-channel
staging layer that holds ready-to-consume buffers and tracks pending disk
entries. These are the storage primitives consumed by OutputWriter and
InputChannel in later commits.
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