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  1. Jenkins
  2. JENKINS-43176

MercurialChangeLogParser fails in parallel checkouts

    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: Major Major
    • Operating System: Centos 7.2, 64-bit
      JDK: 1.8.0
      Jenkins: 2.48
      Mercurial Plugin: 1.59
      Running Jenkins directly
      No reverse proxy
      installed via yum
      issue occurs on the master node

      Using parallel nodes and checkout sometimes causes the following error:

      hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
       <changesets>
       '
       at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:55)
       at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:26)
       at org.jenkinsci.plugins.workflow.job.WorkflowRun.onCheckout(WorkflowRun.java:746)
       at org.jenkinsci.plugins.workflow.job.WorkflowRun.access$1500(WorkflowRun.java:125)
       at org.jenkinsci.plugins.workflow.job.WorkflowRun$SCMListenerImpl.onCheckout(WorkflowRun.java:936)
       at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:123)
       at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:83)
       at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:73)
       at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:47)
       at hudson.security.ACL.impersonate(ACL.java:260)
       at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:44)
       at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
       at java.lang.Thread.run(Thread.java:745)
       Suppressed: hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
       <changesets>
       '
       ... 16 more
       Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
       at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
       at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
       at org.apache.commons.digester.Digester.parse(Digester.java:1871)
       at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
       ... 15 more
       Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
       at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
       at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
       at org.apache.commons.digester.Digester.parse(Digester.java:1871)
       at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
       ... 15 more
       Finished: FAILURE

      Here is the code that I used to generate that error:

       

      #!groovy
      
      try
      {
      parallel (
      0: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } },
      1: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } },
      2: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } },
      3: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } },
      4: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } },
      5: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } },
      6: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } },
      7: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } },
      8: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } },
      9: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test', clean: true) } }
      )
      }
      catch (e)
      {
      throw e
      }
      

       

      However this error happens randomly. In the attachments, I did two identical runs, one passes, the other has multiple failed nodes.

       

      Also I was able to reproduce this error with just two parallel nodes.

       

      My current workaround is to not use parallel nodes, but then jobs run much slower. Does anyone have an alternative workaround or solution? Or how do I even get started trying to debug this?

       

          [JENKINS-43176] MercurialChangeLogParser fails in parallel checkouts

          Victor Yap created issue -
          Victor Yap made changes -
          Description Original: Using parallel nodes and checkout sometimes causes the following error:
          hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
          <changesets>
          '
          at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:55)
          at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:26)
          at org.jenkinsci.plugins.workflow.job.WorkflowRun.onCheckout(WorkflowRun.java:746)
          at org.jenkinsci.plugins.workflow.job.WorkflowRun.access$1500(WorkflowRun.java:125)
          at org.jenkinsci.plugins.workflow.job.WorkflowRun$SCMListenerImpl.onCheckout(WorkflowRun.java:936)
          at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:123)
          at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:83)
          at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:73)
          at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:47)
          at hudson.security.ACL.impersonate(ACL.java:260)
          at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:44)
          at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
          at java.util.concurrent.FutureTask.run(FutureTask.java:266)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
          at java.lang.Thread.run(Thread.java:745)
          Suppressed: hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
          <changesets>
          '
          ... 16 more
          Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
          at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
          at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
          at org.apache.commons.digester.Digester.parse(Digester.java:1871)
          at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
          ... 15 more
          Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
          at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
          at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
          at org.apache.commons.digester.Digester.parse(Digester.java:1871)
          at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
          ... 15 more
          Finished: FAILURE
           

          Here is the code that I used to generate that error:

           
          {code:java}
          #!groovy

          try
          {
          parallel (
          0: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          1: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          2: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          3: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          4: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          5: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          6: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          7: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          8: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          9: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } }
          )

          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          }
          catch (e)
          {
          throw e
          }
          {code}
           

          However this error happens randomly. In the attachments, I did two identical runs, one passes, the other has multiple failed nodes.

           

          Also I was able to reproduce this error with just two parallel nodes.

           

          My current workaround is to not use parallel nodes, but then jobs run much slower. Does anyone have an alternative workaround or solution? Or how do I even get started trying to debug this?

           
          New: Using parallel nodes and checkout sometimes causes the following error:
          {code:java}
          hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
           <changesets>
           '
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:55)
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:26)
           at org.jenkinsci.plugins.workflow.job.WorkflowRun.onCheckout(WorkflowRun.java:746)
           at org.jenkinsci.plugins.workflow.job.WorkflowRun.access$1500(WorkflowRun.java:125)
           at org.jenkinsci.plugins.workflow.job.WorkflowRun$SCMListenerImpl.onCheckout(WorkflowRun.java:936)
           at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:123)
           at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:83)
           at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:73)
           at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:47)
           at hudson.security.ACL.impersonate(ACL.java:260)
           at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:44)
           at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
           at java.util.concurrent.FutureTask.run(FutureTask.java:266)
           at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
           at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
           at java.lang.Thread.run(Thread.java:745)
           Suppressed: hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
           <changesets>
           '
           ... 16 more
           Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
           at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
           at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
           at org.apache.commons.digester.Digester.parse(Digester.java:1871)
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
           ... 15 more
           Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
           at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
           at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
           at org.apache.commons.digester.Digester.parse(Digester.java:1871)
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
           ... 15 more
           Finished: FAILURE{code}

          Here is the code that I used to generate that error:

           
          {code:java}
          #!groovy

          try
          {
          parallel (
          0: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          1: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          2: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          3: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          4: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          5: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          6: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          7: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          8: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          9: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } }
          )

          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          }
          catch (e)
          {
          throw e
          }
          {code}
           

          However this error happens randomly. In the attachments, I did two identical runs, one passes, the other has multiple failed nodes.

           

          Also I was able to reproduce this error with just two parallel nodes.

           

          My current workaround is to not use parallel nodes, but then jobs run much slower. Does anyone have an alternative workaround or solution? Or how do I even get started trying to debug this?

           
          Victor Yap made changes -
          Description Original: Using parallel nodes and checkout sometimes causes the following error:
          {code:java}
          hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
           <changesets>
           '
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:55)
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:26)
           at org.jenkinsci.plugins.workflow.job.WorkflowRun.onCheckout(WorkflowRun.java:746)
           at org.jenkinsci.plugins.workflow.job.WorkflowRun.access$1500(WorkflowRun.java:125)
           at org.jenkinsci.plugins.workflow.job.WorkflowRun$SCMListenerImpl.onCheckout(WorkflowRun.java:936)
           at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:123)
           at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:83)
           at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:73)
           at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:47)
           at hudson.security.ACL.impersonate(ACL.java:260)
           at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:44)
           at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
           at java.util.concurrent.FutureTask.run(FutureTask.java:266)
           at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
           at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
           at java.lang.Thread.run(Thread.java:745)
           Suppressed: hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
           <changesets>
           '
           ... 16 more
           Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
           at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
           at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
           at org.apache.commons.digester.Digester.parse(Digester.java:1871)
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
           ... 15 more
           Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
           at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
           at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
           at org.apache.commons.digester.Digester.parse(Digester.java:1871)
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
           ... 15 more
           Finished: FAILURE{code}

          Here is the code that I used to generate that error:

           
          {code:java}
          #!groovy

          try
          {
          parallel (
          0: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          1: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          2: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          3: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          4: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          5: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          6: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          7: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          8: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          9: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } }
          )

          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) }
          }
          catch (e)
          {
          throw e
          }
          {code}
           

          However this error happens randomly. In the attachments, I did two identical runs, one passes, the other has multiple failed nodes.

           

          Also I was able to reproduce this error with just two parallel nodes.

           

          My current workaround is to not use parallel nodes, but then jobs run much slower. Does anyone have an alternative workaround or solution? Or how do I even get started trying to debug this?

           
          New: Using parallel nodes and checkout sometimes causes the following error:
          {code:java}
          hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
           <changesets>
           '
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:55)
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:26)
           at org.jenkinsci.plugins.workflow.job.WorkflowRun.onCheckout(WorkflowRun.java:746)
           at org.jenkinsci.plugins.workflow.job.WorkflowRun.access$1500(WorkflowRun.java:125)
           at org.jenkinsci.plugins.workflow.job.WorkflowRun$SCMListenerImpl.onCheckout(WorkflowRun.java:936)
           at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:123)
           at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:83)
           at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:73)
           at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:47)
           at hudson.security.ACL.impersonate(ACL.java:260)
           at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:44)
           at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
           at java.util.concurrent.FutureTask.run(FutureTask.java:266)
           at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
           at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
           at java.lang.Thread.run(Thread.java:745)
           Suppressed: hudson.util.IOException2: Failed to parse /var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml: '<?xml version="1.0" encoding="UTF-8"?>
           <changesets>
           '
           ... 16 more
           Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
           at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
           at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
           at org.apache.commons.digester.Digester.parse(Digester.java:1871)
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
           ... 15 more
           Caused by: org.xml.sax.SAXParseException; systemId: file:/var/lib/jenkins/jobs/parallel-test/builds/28/changelog0.xml; lineNumber: 3; columnNumber: 1; XML document structures must start and end within the same entity.
           at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
           at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
           at org.apache.commons.digester.Digester.parse(Digester.java:1871)
           at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:51)
           ... 15 more
           Finished: FAILURE{code}
          Here is the code that I used to generate that error:

           
          {code:java}
          #!groovy

          try
          {
          parallel (
          0: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          1: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          2: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          3: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          4: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          5: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          6: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          7: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          8: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } },
          9: { node { checkout($class: 'MercurialSCM', source: 'https://bitbucket.org/vicyap/jenkins-parallel-test&#39;, clean: true) } }
          )
          }
          catch (e)
          {
          throw e
          }
          {code}
           

          However this error happens randomly. In the attachments, I did two identical runs, one passes, the other has multiple failed nodes.

           

          Also I was able to reproduce this error with just two parallel nodes.

           

          My current workaround is to not use parallel nodes, but then jobs run much slower. Does anyone have an alternative workaround or solution? Or how do I even get started trying to debug this?

           
          Victor Yap made changes -
          Priority Original: Minor [ 4 ] New: Major [ 3 ]
          Jesse Glick made changes -
          Component/s New: workflow-scm-step-plugin [ 21717 ]
          Component/s Original: mercurial-plugin [ 15502 ]
          Jesse Glick made changes -
          Labels Original: checkout mercurial New: checkout mercurial threads
          Hector Miuler Malpica Gallegos made changes -
          Priority Original: Major [ 3 ] New: Blocker [ 1 ]
          Jesse Glick made changes -
          Link New: This issue relates to JENKINS-47201 [ JENKINS-47201 ]
          Sam Van Oort made changes -
          Priority Original: Blocker [ 1 ] New: Major [ 3 ]
          Vivek Pandey made changes -
          Labels Original: checkout mercurial threads New: checkout mercurial threads triaged-2018-11

            Unassigned Unassigned
            vicyap Victor Yap
            Votes:
            13 Vote for this issue
            Watchers:
            14 Start watching this issue

              Created:
              Updated: