Job A triggers a variable number of job B depending on a environment variable. It can be zero but since "Counter Parameter Factory" doesnt allow zero repetitions (Java exception) I had to include this step as a conditional build step. Job A must wait until the end of all B jobs so option "Block until the triggered projects finish their builds" is selected (because it is really a diamond execution).
This jobs configuration works fine but if you launch another A (in parallel) when it finish its first step and reach conditional step, it get stuck waiting until the end of all the jobs from first execution, once first A execution finished second execution continue executing its B jobs.
This is a kind of interlocking process between executions.
I have attached an example project with this problem, executable job is "QueueInterlockTest_main". To test this problem you must launch two executions of this job (in parallel), you will notice how second execution do not trigger "QueueInterlockTest_subtask" until first execution is finished.
Jacobo Jimenez
added a comment - I have attached an example project with this problem, executable job is "QueueInterlockTest_main". To test this problem you must launch two executions of this job (in parallel), you will notice how second execution do not trigger "QueueInterlockTest_subtask" until first execution is finished.
We are experiencing the same problem in our automated regression test system built on Jenkins and are looking for a solution for this one to be able to parallelize our job execution. Is there anything I could help in terms of diagnosing the issue? The description from Jacobo looks exhaustive, though...
Alexey Bespaly
added a comment - We are experiencing the same problem in our automated regression test system built on Jenkins and are looking for a solution for this one to be able to parallelize our job execution. Is there anything I could help in terms of diagnosing the issue? The description from Jacobo looks exhaustive, though...
Same issue here. This is also a very common case when commonly used step is created for workflows in which multiple instants of job will be executed on the same node.
Kevin Chiu
added a comment - - edited Same issue here. This is also a very common case when commonly used step is created for workflows in which multiple instants of job will be executed on the same node.
I've got this problem too, but with wrapped "execute nant target" build step inside conditional section.
The steps to reproduce issue is next
Install node-label plugin, which allows to target build executon on some exact node.
Create job, configure single conditional step with wrapped long executable task(groovy script while(true){} fits maybe).
Allow concurrent builds for this job.
Make job parametrized, configure node-label parameter, with allowed two nodes to run this job
Run job on first node, after that run job on another node.
Console Output shows that second run hangs execution before conditional step
Peter S
added a comment - I've got this problem too, but with wrapped "execute nant target" build step inside conditional section.
The steps to reproduce issue is next
Install node-label plugin, which allows to target build executon on some exact node.
Create job, configure single conditional step with wrapped long executable task(groovy script while(true){} fits maybe).
Allow concurrent builds for this job.
Make job parametrized, configure node-label parameter, with allowed two nodes to run this job
Run job on first node, after that run job on another node.
Console Output shows that second run hangs execution before conditional step
Turns out the blocking I encountered is due to the post-build steps of a concurrent tasks. It seems to be a more general one on plugins that do artifcats copy/upload:
Before we are using copy artifacts back to master, now have changed to use the Publish over SSH plugin instead. Tested concurrent build couple of times and issue gone.
Kevin Chiu
added a comment - - edited Turns out the blocking I encountered is due to the post-build steps of a concurrent tasks. It seems to be a more general one on plugins that do artifcats copy/upload:
JENKINS-10234
Before we are using copy artifacts back to master, now have changed to use the Publish over SSH plugin instead. Tested concurrent build couple of times and issue gone.
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Bug
Major
Alexey Bespaly
added a comment - 
Kevin Chiu
added a comment - - edited Same issue here. This is also a very common case when commonly used step is created for workflows in which multiple instants of job will be executed on the same node. 
Peter S
added a comment - 
I have attached an example project with this problem, executable job is "QueueInterlockTest_main". To test this problem you must launch two executions of this job (in parallel), you will notice how second execution do not trigger "QueueInterlockTest_subtask" until first execution is finished.