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From "Li Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5233) Support for specifying a path for ATS plugin jars
Date Wed, 06 Jul 2016 18:02:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-5233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15364758#comment-15364758
] 

Li Lu commented on YARN-5233:
-----------------------------

Oh and, our ApplicationClassLoader will delegate the loadClass process to its parent after
the load fails in its code:
{code}
    if (c == null && !isSystemClass(name, systemClasses)) {
      // Try to load class from this classloader's URLs. Note that this is like
      // the servlet spec, not the usual Java 2 behaviour where we ask the
      // parent to attempt to load first.
      try {
        c = findClass(name);
        if (LOG.isDebugEnabled() && c != null) {
          LOG.debug("Loaded class: " + name + " ");
        }
      } catch (ClassNotFoundException e) {
        if (LOG.isDebugEnabled()) {
          LOG.debug(e);
        }
        ex = e;
      }
    }

    if (c == null) { // try parent
      c = parent.loadClass(name);
      if (LOG.isDebugEnabled() && c != null) {
        LOG.debug("Loaded class from parent: " + name + " ");
      }
    }
{code}

> Support for specifying a path for ATS plugin jars
> -------------------------------------------------
>
>                 Key: YARN-5233
>                 URL: https://issues.apache.org/jira/browse/YARN-5233
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: 2.8.0
>            Reporter: Li Lu
>            Assignee: Li Lu
>         Attachments: YARN-5233-trunk.001.patch, YARN-5233-trunk.002.patch, YARN-5233-trunk.003.patch
>
>
> Third-party plugins need to add their jars to ATS. Most of the times, isolation is not
needed. However, there needs to be a way to specify the path. For now, the jars on that path
can be added to default classloader.



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