No I don't have any post commit hook defined. Starting with a green field
here. Sounds like that's what I need to setup though.
I also don't have the "Scan Multibranch Pipeline Triggers" checkbox enabled
on my job configuration. I really don't know how it could be triggering
unless that PollSCM in my Jenkinsfile is somehow working.
On Tuesday, August 29, 2017 at 6:48:55 PM UTC-5, Stephen Connolly wrote:
>
> Sounds like you have a post commit hook pushing the commit details to
> Jenkins, in which case events are working... to confirm, check the cause of
> a build, if it says "Branch Event" then you are solid gold...
>
>
> On Wed 30 Aug 2017 at 00:42, Dallas Clement <dallas.a...@gmail.com
> <javascript:>> wrote:
>
>> Thanks for the info Stephen. I was not aware that the pollSCM trigger
>> was ignored in a multibranch pipeline. Something is polling for changes.
>> When someone pushes a change, a build gets triggered shortly thereafter. I
>> do agree with you that polling is evil and not scalable with many
>> branches. I would like to make things event driven. Will need to
>> investigate how with git.
>>
>>
>> On Tuesday, August 29, 2017 at 5:33:42 PM UTC-5, Stephen Connolly wrote:
>>>
>>>
>>> On Tue 29 Aug 2017 at 23:21, Stephen Connolly <stephen.al...@gmail.com>
>>> wrote:
>>>
>>
>>>> On Tue 29 Aug 2017 at 22:35, Dallas Clement <dallas.a...@gmail.com>
>>>> wrote:
>>>>
>>>>> If I click on the "Scan Multibranch Pipeline Now" link in the Jenkins
>>>>> dashboard, it will kick off a build immediately even when there were no
>>>>> changes. I have my declarative Jenkinsfile configured to poll for SCM
>>>>> changes. I only want builds to be triggered from SCM changes. Any idea
>>>>> how I can suppress this behavior?
>>>>>
>>>>> pipeline {
>>>>> agent any
>>>>> options {
>>>>> disableConcurrentBuilds()
>>>>> timestamps()
>>>>> buildDiscarder(logRotator(numToKeepStr: '8'))
>>>>> }
>>>>> triggers {
>>>>> // Poll every 5 minutes for new changes
>>>>> pollSCM 'H/5 * * * *'
>>>>>
>>>>
>>>> You do know in multibranch that this poll is ignored?
>>>>
>>>
>>> To explain why the design is this way:
>>>
>>> 1. Polling is evil
>>>
>>> 2. In most SCM implementations the poll for each branch is effectively a
>>> redundant check, so if you have 10 branches all polling then Jenkins will
>>> end up doing the *exact same* operation in a parallel batch of 5 (default
>>> polling pool size) and follow up with another batch of 5... hammering the
>>> SCM where one request would provide the answer for all 10 branches.
>>>
>>> 3. Branch API needs to maintain its own state as to the last revision
>>> built. Polling will not update that correctly.
>>>
>>> 4. Polling for Git can be a mess due to how git can be configured to
>>> built multiple branches in one job.
>>>
>>> So the decision is that polling is disabled on multibranch leaf jobs (if
>>> you have a case where it is not disabled... congratulations you have found
>>> a bug... likely not the one you thought, but a bug... polling should not
>>> happen for leaf nodes of a multibranch project)
>>>
>>> You want to have indexing at a frequency such that if an event was lost,
>>> you cannot go more than this long without the build (typically somewhere
>>> between 4-24h for most people)
>>>
>>> You want event support to trigger the builds, not polling
>>>
>>> }
>>>>>
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