Poll SCM using Git builds multiple times if not successfull

[Mike Neary]

I have a project that poll's Git every 5 minutes and builds on changes using the Git plugin in a pipeline job.  The issue I'm having is that if the build fails (inside of 5 minutes), the next poll causes another build.  I also had a situation where a build started but didn't finish within the 5 minutes (ran for 4 hours without finishing) and so another build was put in the queue, eventually leading to more than 50 jobs in the queue.

Is this expected behavior?  I would more expect once a pull is done that the next poll would find no changes and do nothing.

Jenkins v2.19.4

Git plugin v3.0.1

[Mark Waite]

Comments are inline

On Thu, Dec 8, 2016 at 9:20 AM Mike Neary <mcne...@gmail.com> wrote:

I have a project that poll's Git every 5 minutes and builds on changes using the Git plugin in a pipeline job.  The issue I'm having is that if the build fails (inside of 5 minutes), the next poll causes another build.  

I would expect that if the pipeline build fails before the next poll, then the next poll would detect there were no changes since the previous poll, and would not start a new build.  However, it may be that the pipeline assumes build failures (as opposed to unstable builds) should be retried.  I've not seen that behavior, but I tend to prefer the notifyCommit / web hook technique rather than polling for changes.

 

I also had a situation where a build started but didn't finish within the 5 minutes (ran for 4 hours without finishing) and so another build was put in the queue, eventually leading to more than 50 jobs in the queue.

I think that might reasonably be the expected behavior of the pipeline code.  Pipelines allow multiple concurrent execution of the same job, and it may be that the pipeline is assuming that a specific SHA1 is not "built" until the job has completed.

 

Is this expected behavior?  I would more expect once a pull is done that the next poll would find no changes and do nothing.

Jenkins v2.19.4

Git plugin v3.0.1

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