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From "Dave Marion (JIRA)" <>
Subject [jira] [Updated] (ACCUMULO-2831) HDFS Configuration classloader not correct when using VFSClassLoader
Date Sat, 24 May 2014 00:36:02 GMT


Dave Marion updated ACCUMULO-2831:

    Fix Version/s: 1.7.0

> HDFS Configuration classloader not correct when using VFSClassLoader
> --------------------------------------------------------------------
>                 Key: ACCUMULO-2831
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: start
>    Affects Versions: 1.6.0
>            Reporter: Dave Marion
>            Assignee: Dave Marion
>              Labels: classloader
>             Fix For: 1.5.2, 1.6.1, 1.7.0
> When using hdfs to load jars with the VFS classloader, the Hadoop FileSystem object is
created before the VFS classloader. The FileSystem object and associated Configuration object
are cached by the DFS Client and use the thread context classloader at the time of creation,
which is not the VFS class loader. This leads to Accumulo classes not being found when they
are loaded via the Configuration object, such as when WAL recovery is performed. The WAL is
read using a SequenceFile$Reader object, which tries to load the Key and Value classes for
the SequenceFile using WritableName.getClass(String, Configuration)

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