Page History

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This approach doesn't require any special attention we can push the existing source to a separated repository (only the selected branches).

Advantages:

1. Easier to search for 5 years old changes

Disadvantages:

1. Git log/history will contain all the irrelevant commits (ancient mapreduce/yarn commits for example)
2. Repo size will remain very huge (~1G for Hadoop) which makes slower all of the CI steps

Disadvantages:

1. Easier to search for 5 years old changes

(2) Filter branch and create a new git history

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See this repository as an example: HDFS-13258. Ozone: restructure Hdsl/Ozone code to separated maven subprojects. https://github.com/elek/hadoop-ozone

Note: I suggest to follow the second approach

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