Hi,
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I use pipeline job. (not multibranch)
The config of this job is,
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- Build Triggers > Poll SCM checked, Schedule */2 * * * *
- Pipeline > Definition : Pipeline script from SCM, SCM : Perforce Software, Polling build filters : Polling per Change Enabled checked
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I think jenkins job runs well usally, but sometimes this problem occurs.

You can see job created every two minutes.
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In this case, #114 shows one CL 2921937

and also #115 shows same CL 2921937

actually up to #140 all runs shows same CL.
 
I do not know why this happened, I found that it could be a clue.
Two CLs are submitted very closely.

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Please check this situation.
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Edited:
Several Polling Log :


