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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-12406) AbstractMapWritable.readFields throws ClassNotFoundException with custom writables
Date Sun, 10 Apr 2016 20:42:25 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated HADOOP-12406:
---------------------------------------------
          Labels:   (was: bug hadoop io newbie patch-available)
    Hadoop Flags: Reviewed
          Status: Patch Available  (was: Open)

> 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
>         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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