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由 sumeet 提交于
Summary: If we have same compaction filter for each compaction, application cannot know about the different compaction processes. Later on, we can put in more details in compaction filter for the application to consume and use it according to its needs. For e.g. In the universal compaction, we have a compaction process involving all the files while others don't involve all the files. Applications may want to collect some stats only when during full compaction. Test Plan: run existing unit tests Reviewers: haobo, dhruba Reviewed By: dhruba CC: xinyaohu, leveldb Differential Revision: https://reviews.facebook.net/D12057
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