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由 sdong 提交于
Summary: Add a counter in SnapshotList to show number of snapshots. Also a unix timestamp in every snapshot. Add two DB Properties to return number of snapshots and timestamp of the oldest one. Test Plan: Add unit test checking Reviewers: yhchiang, rven, igor Reviewed By: igor Subscribers: leveldb, dhruba, MarkCallaghan Differential Revision: https://reviews.facebook.net/D29919
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