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  1. Jenkins
  2. JENKINS-23902

Matrix parent takes executor slot and blocks children

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      Not sure when the behaviour changed, but the parent job used to take an extra "free" slot. Now it's taking an actual slot, which can end up being the only slot that one of its children can use, leading to an effective deadlock.

          [JENKINS-23902] Matrix parent takes executor slot and blocks children

          James Howe added a comment -

          No, but it should be defaulting to "true". Unless that's what changed and the wiki page is out of date?

          James Howe added a comment - No, but it should be defaulting to "true". Unless that's what changed and the wiki page is out of date?

          Daniel Beck added a comment -

          Are you using a plugin that changes how the queue or executor assignment work? (When in doubt, post your entire plugin list)

          Is this happening regularly or just in special circumstances? Can you reproduce the problem on a pristine Jenkins instance?

          Daniel Beck added a comment - Are you using a plugin that changes how the queue or executor assignment work? (When in doubt, post your entire plugin list) Is this happening regularly or just in special circumstances? Can you reproduce the problem on a pristine Jenkins instance?

          James Howe added a comment -

          Yeah, it could be a few plugins actually. I'll see what I can reproduce with.

          James Howe added a comment - Yeah, it could be a few plugins actually. I'll see what I can reproduce with.

          Oleg Nenashev added a comment -

          Throttle Concurrent Builds plugin seems to be responsible.
          See https://github.com/jenkinsci/throttle-concurrent-builds-plugin/pull/22

          Oleg Nenashev added a comment - Throttle Concurrent Builds plugin seems to be responsible. See https://github.com/jenkinsci/throttle-concurrent-builds-plugin/pull/22

          Oleg Nenashev added a comment -

          Closing as Fixed.
          Please reopen if upgrading to throttle-concurrents-1.8.4 does not resolve the issue

          Oleg Nenashev added a comment - Closing as Fixed. Please reopen if upgrading to throttle-concurrents-1.8.4 does not resolve the issue

          James Howe added a comment -

          Upgrading to throttle-concurrents-1.8.4 did fix it.

          However, something has broken it again.
          Now on Jenkins 1.590, throttle-concurrents-1.8.4, matrix-project-1.4, priority-sorter-2.9.
          I thought it was a 1.590->1.593 update, but downgrading didn't resolve it.

          James Howe added a comment - Upgrading to throttle-concurrents-1.8.4 did fix it. However, something has broken it again. Now on Jenkins 1.590, throttle-concurrents-1.8.4, matrix-project-1.4, priority-sorter-2.9. I thought it was a 1.590->1.593 update, but downgrading didn't resolve it.

          James Howe added a comment -

          Priority sorter is not in advanced mode.

          James Howe added a comment - Priority sorter is not in advanced mode.

          James Howe added a comment -

          Odd. With no apparent changes to config or plugins, they started using flyweight executors again.

          James Howe added a comment - Odd. With no apparent changes to config or plugins, they started using flyweight executors again.

          Simon Richter added a comment -

          I saw that happen when the slave node the job should have run on was down at that time and the matrix job was queued.

          Simon Richter added a comment - I saw that happen when the slave node the job should have run on was down at that time and the matrix job was queued.

          Daniel Beck added a comment -

          There have been fixes to the queue behavior until 1.610. That version or higher would be needed for any follow-up issue to make sense.

          Daniel Beck added a comment - There have been fixes to the queue behavior until 1.610. That version or higher would be needed for any follow-up issue to make sense.

            kohsuke Kohsuke Kawaguchi
            jameshowe James Howe
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