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Bug
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Resolution: Not A Defect
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Major
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None
Setting the "Max # of builds to keep" for a job does not cause old builds to be discarded. I set this as Major as this will lead to the build system dying after running out of disk space.
I have found a work around here: http://groups.google.com/group/jenkinsci-users/browse_thread/thread/5573bee99bc2c42d
I created a job in my Jenkins instance to run the following groovy script (as a "system" groovy script - not sure if that matters...) - this forces the old builds to be discarded per what I have defined in the config:
import hudson.model.* for(job in Hudson.instance.items) { job.logRotate() }
[JENKINS-13039] Max # of builds to keep not deleting old builds
Thomas B
added a comment - Same issue here too.
In addition
job.logRotate()
encounters "delete" exceptions on a few % of my build (it manages to delete the build but think it's still here ...) and since I've stacked 800+ builds (instead of 4) it's pretty enoying
Using version
Jenkins ver. 1.489
on Linux
Thomas B
added a comment - Same issue here too.
In addition
job.logRotate()
encounters "delete" exceptions on a few % of my build (it manages to delete the build but think it's still here ...) and since I've stacked 800+ builds (instead of 4) it's pretty enoying
Using version
Jenkins ver. 1.489
on Linux 
Michael Wenk
added a comment - Running 1.512 and have same issue. UI shows one build (what it should) and disk shows 20.
Michael Wenk
added a comment - Running 1.512 and have same issue. UI shows one build (what it should) and disk shows 20. logRotate() is called whenever a build is finished.
So it's not sufficient to just configure this value and expect old builds to get cleaned up immediately (which is how I interpret the issue – the script basically does for all jobs what individually is done after a build).
Adding a button to manually trigger cleanup or something like that is best handled by a plugin.
What could be done is improve the documentation to clarify that old builds are cleaned up only after a new build finishes.
Encountering same issue.
Using version 1.459 of jenkins on windows 2008 r2 plateform.