| commit | a96742c0357ee97da1bf50cde431bf05aae421cc | [log] [tgz] |
|---|---|---|
| author | Dave Borowitz <dborowitz@google.com> | Mon Oct 24 14:51:22 2016 -0400 |
| committer | Dave Borowitz <dborowitz@google.com> | Thu Jan 12 16:47:49 2017 -0500 |
| tree | 9fdf0c5ac6e075aae0d940208f6b85e48b80dd44 | |
| parent | f125df6aa66eaf2b81420c3b2a75a969cb6605ef [diff] |
Support temporarily read-only changes via NoteDbChangeState Add a new piece of data to NoteDbChangeState indicating that a change is read-only until a specified future time. We use a timestamp instead of a separate state to support a migration step where the job doing the migration might die, so the change automatically becomes read-write again without manual intervention. This read-only state only needs to be checked while updating ReviewDb, which includes an atomic update to the noteDbState field. There are exactly two locations that do this atomic update: ChangeRebuilderImpl#execute and BatchUpdate.ChangeTask#call. We don't bother with attempting to double-check this field when doing the corresponding NoteDb write, for example from NoteDbUpdateManager. It's not possible when we're about to write to NoteDb to do a race-free atomic read of both the read-only state from ReviewDb and the ref in NoteDb that we're about to update. So, we just let the NoteDb write attempt proceed. This turns out to not affect the correctness of the migration process; the race condition is explained in more detail in the commit that implements the migration process. Change-Id: If21353582f678b8788285bc2e9f7b50a5c14f6d4
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