Problem

I have a huge repository (~500MB) with many branches (~30) with each containing a Jenkinsfile. The first indexing is quite painful.

Jenkins will detect all branches, and trigger a build for each one. Each build will start by cloning the git repository on the master to fetch the Jenkinsfile. But this tasks will not use/require a free executor on the master. So, the 30 git clone will be launched at the same time, trying to download 30 times the same 500MB repository. It will end with a really slow Jenkins and a timeout.

I'll have to manually relaunch every branch, one or two at a time to fix this problem.

Possible solution

Is it possible to use an executor on the master during the checkout ? To throttle the git clones ?

How to reproduce it

• Create a git repository
• Create a Jenkinsfile with something in it (echo 'hello world')
• Add a huge file (an ISO of your favorite Linux distribution or something else)
• Commit it
• Create 30 branches
• Add this project in your Jenkins as a Multibranch Pipeline.