Allow compaction to reclaim storage more effectively.
Summary: This diff allows compaction to reclaim storage more effectively. In the current design, compactions are mainly triggered based on the file sizes. However, since deletion entries does not have value, files which have many deletion entries are less likely to be compacted. As a result, it may took a while to make deletion entries to be compacted. This diff address issue by compensating the size of deletion entries during compaction process: the size of each deletion entry in the compaction process is augmented by 2x average value size. The diff applies to both leveled and universal compacitons. Test Plan: develop CompactionDeletionTrigger make db_test ./db_test Reviewers: haobo, igor, ljin, sdong Reviewed By: sdong Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D19029
Showing
想要评论请 注册 或 登录