Add blob file state to VersionEdit (#6416)
Summary: BlobDB currently does not keep track of blob files: no records are written to the manifest when a blob file is added or removed, and upon opening a database, the list of blob files is populated simply based on the contents of the blob directory. This means that lost blob files cannot be detected at the moment. We plan to solve this issue by making blob files a part of `Version`; as a first step, this patch makes it possible to store information about blob files in `VersionEdit`. Currently, this information includes blob file number, total number and size of all blobs, and total number and size of garbage blobs. However, the format is extensible: new fields can be added in both a forward compatible and a forward incompatible manner if needed (similarly to `kNewFile4`). Pull Request resolved: https://github.com/facebook/rocksdb/pull/6416 Test Plan: `make check` Differential Revision: D19894234 Pulled By: ltamasi fbshipit-source-id: f9753e1f2aedf6dadb70c09b345207cb9c58c329
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db/blob_file_state.cc
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db/blob_file_state.h
0 → 100644
db/blob_file_state_test.cc
0 → 100644
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