Git refusing to merge unrelated histories on rebase

Question

While using the git rebase origin/development I constantly keep getting an error message which is shown from Git:

fatal: refusing to merge unrelated histories 
Error redoing merge 1234deadbeef1234deadbeef

I have been using the version 2.9.0 for my GIT and it used to work fine in the previous version, so how could I continue this rebase by permitting an unrelated set of histories with the forced flag which has been introduced in the new release?

Answer 1

To answer your question, the “git merge” did allow the combining of two branches which do not have a common base which is by default and this has caused a relatively new history of the brand for an existing project which is created. This then would get taken by a maintainer which gives access to a parallel history which merges into an existing project. The --allow-unrelated-histories option line is to be used in very unpredictable events which would take two projects which started life independently and then merge them. If what you are looking for is to force a merge between the two projects to occur, then use the line below:-

--allow-unrelated-histories