java.util.concurrent.CancellationException | 2 weeks ago
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    Getting CancellationException

    GitHub | 2 years ago | sawickil
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    [JIRA] [metrics-plugin] (JENKINS-32926) Recurring "Too many health check executions queued" warning in Jenkins log

    Google Groups | 8 months ago | (JIRA)
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    I've recently started seeing this warning popping up in my Jenkins system log: Feb 12, 2016 3:26:43 PM WARNING jenkins.metrics.util.HealthChecksThreadPool dropOldestInQueue Too many health check executions queued, dropping oldest one. This may mean some health checks are taking too long to execute: jenkins.metrics.util.HealthChecksThreadPool@3cf11acf[Running, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 503], queue size=1, health checks=[disk-space, plugins, temporary-space, thread-deadlock] (4) [java.util.concurrent.FutureTask@8afd366] Feb 12, 2016 3:26:43 PM WARNING runHealthChecks Error executing health check thread-deadlock java.util.concurrent.CancellationException at at java.util.concurrent.FutureTask.get( at at jenkins.metrics.api.Metrics$HealthChecker.execute( at jenkins.metrics.api.Metrics$HealthChecker.access$500( at jenkins.metrics.api.Metrics$HealthChecker$ at java.util.concurrent.Executors$ at at java.util.concurrent.ThreadPoolExecutor.runWorker( at java.util.concurrent.ThreadPoolExecutor$ at I only noticed it today but I look at the logs every couple of days at least, and I haven't seen it until now. A Google search doesn't return any other instances of it appearing, so beyond a quick glance at the source code I can't say for sure what's causing it. As a one time thing I'd write it off but I'm seeing it repeated every couple of minutes following my last reboot. Should I be concerned about this?

    Jenkins JIRA | 8 months ago | Nick Lykins
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    WCS behaves badly or fails altogether when CPU is burdened

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Root Cause Analysis

  1. java.util.concurrent.CancellationException

    No message provided

  2. Java RT
    2. java.util.concurrent.FutureTask.get(
    2 frames
  3. futures
    1. futures.NormalFuture.main(
    1 frame