Cheng Chang 1b224324b5 Track WAL in MANIFEST: persist WALs to and recover WALs from MANIFEST (#7256)
Summary:
This PR makes it able to `LogAndApply` `VersionEdit`s related to WALs, and also be able to `Recover` from MANIFEST with WAL related `VersionEdit`s.

The `VersionEdit`s related to WAL are treated similarly as those related to column family operations, they are not applied to versions, but can be in a commit group. Mixing WAL related `VersionEdit`s with other types of edits will make logic in `ProcessManifestWrite` more complicated, so `VersionEdit`s related to WAL can either be WAL additions or deletions, like column family add and drop.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7256

Test Plan: a set of unit tests are added in `version_set_test.cc`

Reviewed By: riversand963

Differential Revision: D23123238

Pulled By: cheng-chang

fbshipit-source-id: 246be2ed4744fd03fa2738aba408aaa611d0379c
2020-10-23 22:49:51 -07:00
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2020-06-15 10:47:02 -07:00
2020-10-20 11:50:30 -07:00