Let new file take over old file's access count in scheduler for EC/Compact/Compression

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Let new file take over old file's access count in scheduler for EC/Compact/Compression #2182

Closed PHILO-HE closed 4 years ago

PHILO-HE commented 4 years ago

For (un)EC, (un)compact, (un)compress action, new file will be created to overwrite the original files, which is transparent to user. We maintain old file id in corresponding scheduler and make the change for file id in access count tables after action is finished.