[FLINK-32088][checkpoint] Space control in file merging #24807
Merged
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What is the purpose of the change
As we know, the checkpoint file merging will introduce space amplification. This PR introduce a space control in file merging, by rewriting old files and eliminate the empty slot on underlying files.
Brief change log
Verifying this change
Added UTs for file merging manager.
Does this pull request potentially affect one of the following parts:
@Public(Evolving)
: noDocumentation