[jira] [Commented] (HADOOP-12406) AbstractMapWritable.readFields throws ClassNotFoundException with custom writables

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-12406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18048897#comment-18048897 ] 

ASF GitHub Bot commented on HADOOP-12406:
-----------------------------------------

github-actions[bot] commented on PR #32:
URL: https://github.com/apache/hadoop/pull/32#issuecomment-3707479019

   We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
   If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again.
   Thanks all for your contribution.




> AbstractMapWritable.readFields throws ClassNotFoundException with custom writables
> ----------------------------------------------------------------------------------
>
>                 Key: HADOOP-12406
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12406
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 2.7.1
>         Environment: Ubuntu Linux 14.04 LTS amd64
>            Reporter: Nadeem Douba
>            Assignee: Nadeem Douba
>            Priority: Blocker
>             Fix For: 2.8.0, 2.7.3, 3.0.0-alpha1
>
>         Attachments: HADOOP-12406.1.patch, HADOOP-12406.patch
>
>
> Note: I am not an expert at JAVA, Class loaders, or Hadoop. I am just a hacker. My solution might be entirely wrong.
> AbstractMapWritable.readFields throws a ClassNotFoundException when reading custom writables. Debugging the job using remote debugging in IntelliJ revealed that the class loader being used in Class.forName() is different than that used by the Thread's current context (Thread.currentThread().getContextClassLoader()). The class path for the system class loader does not include the libraries of the job jar. However, the class path for the context class loader does. The proposed patch changes the class loading mechanism in readFields to use the Thread's context class loader instead of the system's default class loader.



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