Which is easier to roll back: merge or rebase?

Usually it is easier to roll back a merge, because merge does not rewrite history and (often) adds a single, separate merge commit that is easy to "revert".

rebase, on the other hand, rewrites history, and "rolling it back" more often means returning the branch to an old state/commit, which requires care (especially if it has already been pushed).

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#Why a merge is easier to roll back

#If the merge has already been committed

A separate merge commit M appears in the history. It can be safely undone with:

• Git will create a new commit that undoes the changes introduced by the merge.
• The history stays intact.
• This is safe for branches that are already in the shared repository.

This is a favorite interview answer: "a merge is rolled back with revert".

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#Why a rebase is harder to roll back

#While the rebase is in progress

If the rebase stops on a conflict or you change your mind, it is easy:

This really is simple.

#But once the rebase is finished

You now have new commits with new hashes. "Rolling it back" usually means:

• finding where the branch was before the rebase (often via reflog)
• moving the branch back (for example, with reset)

And here it matters:

• locally this is fine
• if you have already pushed the rebase, you will have to do a force push, which is a risk for the team

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#Summary by situation

• A merge is easier to roll back, especially on shared branches: revert is safe and clear.
• A rebase is easier to "undo" if it is not finished yet: rebase --abort.
• The hardest case is rolling back a rebase after a push, because the history has already been rewritten and you need to act carefully.

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#Short phrasing for an interview

A merge is easier to roll back: it preserves history and is usually undone with git revert (including the merge commit). A rebase rewrites history, so rolling it back after it is finished (and especially after a push) is harder and may require reset/reflog and a force push.