Uploaded image for project: 'Jenkins'
  1. Jenkins
  2. JENKINS-23784

Allow parallel class loading

    XMLWordPrintable

    Details

    • Similar Issues:

      Description

      When running on Java 7, Jenkins should ensure that all its ClassLoader instances are marked parallel-capable. This would improve class loading speed in some circumstances—mainly during startup or when first using new features, but also when searching for Groovy imports and the like.

      At least UberClassLoader, DependencyClassLoader, AntClassLoader2, and PluginFirstClassLoader should be so marked. (PluginFirstClassLoader ought to be made to extend AntClassLoader2 since we control it; all superclasses must be marked.) To work on Java 7, can use this idiom:

      try {
    Method m = ClassLoader.class.getDeclaredMethod("registerAsParallelCapable");
    m.setAccessible(true);
    boolean b = (Boolean) m.invoke(null);
    if (!b) {
        ...warn...
    }
} catch (NoSuchMethodException x) {
    // fine, Java 6
} catch (Exception x) {
    ...warn...
}

      (Unfortunately this pattern must be repeated in such class, since registerAsParallelCapable is caller-sensitive.)

        Attachments

          Issue Links

          is related to

          Bug - A problem which impairs or prevents the functions of the product. JENKINS-24309 UberClassLoader does not cache negative results

          • Major - Major loss of function.
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JENKINS-64479 deadlock in logging and classloading

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • In Review

          Bug - A problem which impairs or prevents the functions of the product. JENKINS-65766 java.lang.LinkageError: ... attempted duplicate class definition for name: ...

          • Major - Major loss of function.
          • Resolved
          links to

          Web Link CloudBees Internal CD-268

          Web Link PR 2581

          Web Link script-security PR 80

          Web Link workflow-cps PR 42

            Activity

            Ascending order - Click to sort in descending order
            9 older comments
            Hide
            Permalink
            jglick Jesse Glick added a comment -

            Unfortunately it seems that Jetty’s WebAppClassLoader does not call ClassLoader.registerAsParallelCapable

            Fixed in bug 464442 and available as of 9.3.0. Currently we bundle 9.2.x.

            Show
            jglick Jesse Glick added a comment - Unfortunately it seems that Jetty’s WebAppClassLoader does not call ClassLoader.registerAsParallelCapable Fixed in bug 464442 and available as of 9.3.0. Currently we bundle 9.2.x .
            Hide
            Permalink
            scm_issue_link SCM/JIRA link daemon added a comment -

            Code changed in jenkins
            User: Jesse Glick
            Path:
            core/src/main/java/hudson/util/MaskingClassLoader.java
            http://jenkins-ci.org/commit/jenkins/a04e2f9836263f7ae5e68617f5bafde18e594446
            Log:
            JENKINS-23784 Avoid acquiring ClassLoader locks. (#2581)

            Show
            scm_issue_link SCM/JIRA link daemon added a comment - Code changed in jenkins User: Jesse Glick Path: core/src/main/java/hudson/util/MaskingClassLoader.java http://jenkins-ci.org/commit/jenkins/a04e2f9836263f7ae5e68617f5bafde18e594446 Log: JENKINS-23784 Avoid acquiring ClassLoader locks. (#2581)
            Hide
            Permalink
            oleg_nenashev Oleg Nenashev added a comment -

            > Fixed in bug 464442 and available as of 9.3.0. Currently we bundle 9.2.x.

            IMHO we should schedule the Jetty upgrade to 9.3.x or 9.4.x as a part of the Java 7 deprecation. The problem is that 9.3.x and 9.2.x are not fully binary compatible IIRC

            Show
            oleg_nenashev Oleg Nenashev added a comment - > Fixed in bug 464442 and available as of 9.3.0. Currently we bundle 9.2.x. IMHO we should schedule the Jetty upgrade to 9.3.x or 9.4.x as a part of the Java 7 deprecation. The problem is that 9.3.x and 9.2.x are not fully binary compatible IIRC
            Hide
            Permalink
            jamesdumay James Dumay added a comment - - edited

            Jesse GlickI saw that there is a bunch of PRs for this ticket that have now been merged. Whats the current status of this ticket?

            Show
            jamesdumay James Dumay added a comment - - edited Jesse Glick I saw that there is a bunch of PRs for this ticket that have now been merged. Whats the current status of this ticket?
            Hide
            Permalink
            jglick Jesse Glick added a comment -

            James Dumay it is open. I think a fix would be easy enough, though verifying its effectiveness is another matter.

            Show
            jglick Jesse Glick added a comment - James Dumay it is open. I think a fix would be easy enough, though verifying its effectiveness is another matter.

              People

              Assignee:
              Unassigned Unassigned
              Reporter:
              jglick Jesse Glick
              Votes:
              2 Vote for this issue
              Watchers:
              8 Start watching this issue

                Dates

                Created:
                Updated: