drainer: Fix #724, Enable drainer to purge old incremental backup data on disk#885

Merged

suzaku merged 6 commits intopingcap:masterfrom suzaku:periodic-gc-for-file-sync

Feb 7, 2020

+130-47

Commits on Jan 15, 2020

drainer: Fix pingcap#724 , Enable drainer to purge old incremental backup data on disk
suzaku
committed
Change return type to the Syncer interface
suzaku
committed

Commits on Feb 3, 2020

Commits on Feb 4, 2020