将 TFVC 迁移到 Git - 是否应该迁移历史记录？

Question

I'm looking to migrate from TFVC to TFS Git.

I noticed that microsoft recommends:

• " Due to the differences in how TFVC and Git store version control history, we recommend that you don't migrate your history. "

...without elaborating on why it's not recommended.

• What are the reasons for not migrating history when moving from TFVC to Git?

For Info: Our codebase is ~9 years old consisting of 2 major projects with ~82k files & ~400k lines of code, and ~90k files and ~500k lines of code

Answer 1

Eventually found this which provides some information: https://docs.microsoft.com/en-us/devops/develop/git/migrate-from-tfvc-to-git

Before attempting a migration with Git-TFS, be aware that there are fundamental differences between the way TFVC and Git store history:

• Git stores history as a snapshot of the repository in time, while TFVC records the discrete operations that occurred on a file. Change types in TFVC like rename, undelete and rollback cannot be expressed in Git. Instead of seeing that file A was renamed to file B, it will only track that file A was deleted and file B was added in the same commit.
• Git does not have a direct analog of a TFVC label. Labels can contain any number of files at any specific version and can reflect files at different versions. Although conceptually similar, Git tags point to a snapshot of the whole repository at a point in time. If the project relies on TFVC labels to know what was delivered, Git tags may not provide this information.
• Merges in TFVC occur at the file level, not at the entire repository. Only a subset of changed files may be merged from one branch to another. Remaining changed files may then be merged in a subsequent changeset. In Git, a merge affects the entire repository, and both sets of individual changes cannot be seen as a merge.

Because of these differences, it is recommended that users do a tip migration and keep their TFVC repository online, but read-only, in order to view history.