Hi all,
I've been using Jenkins for about 2 years but I've never used
multi branch pipeline. I'm starting using them now.
There's a behavior I don't really understand, I tried to look for any
explanation or documentation about it but I couldn't find anything. I do
really hope someone could explain me what's happening and why!
My setup is made of a master Jenkins on windows and an agent node on macOS.
I've just configured a new Multibranch pipeline job to scan periodically a
given repo, actually just for testing purpose I used an "aggressive" 1 min
polling interval.
Then I added a Jenkinsfile to a dedicated branch of this given repo just to
test the pipeline.
The first time the multi job pipeline was triggered it started scanning for
branches, it found the only branch containing a Jenkinsfile and it created
a dedicated job for that branch.
As well as every one minute the multi branch pipeline job gets triggered
and scan for branches as well and if it finds that the test branch has some
changes (pushed files) it does start the job it created for this branch.
Everything as expected for now.
What I really DON'T UNDERSTAND and I would like not to happen is that every
time the job created by the multi branch pipeline starts, it starts on the
master node (windows), IT DOES START SCANNING BRANCHES even if this is not
the multibranch pipeline job, after branch scanning it performs a light
clone to get the Jenkinsfile of its branch, it does analyze and then it
does run the branch on the macOS agent given the node label found into the
Jenkinsfile.
What I don't understand and I would like not to happen is that it does
perform a branches scanning even into the created job, the one created on
the discovered branch having the Jenkinsfile. What's the reason for this
behavior? Considering we have more than 3k branches and they are bound to
grow (it's quite an old project), every time a build start I'm wasting time
just to perform an unneeded branches scanning!!!!
Can anyone explain me please and possibly giving me a solution to disable
this unneeded scanning?
Thanks in advance
Marco
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