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From "Jane Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7549) Use JDK ServiceLoader mechanism to find FileSystem implementations
Date Sat, 27 Oct 2012 00:57:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485314#comment-13485314
] 

Jane Chen commented on HADOOP-7549:
-----------------------------------

Hi Alejandro,

Thank you for your input.  

I was using the bundled jars directly. I found that I have to call FileSystem.loadFileSystems()
in the same thread where JVM is initialized.  So I got it working now.  

I'm guessing the class loader used in the ServiceLoader doesn't get the classpath set if it
isn't the same thread creating the JVM.  But I haven't tried to prove it.  I'd love to hear
it if you have any insight on that.

Thanks again,
Jane 
                
> Use JDK ServiceLoader mechanism to find FileSystem implementations
> ------------------------------------------------------------------
>
>                 Key: HADOOP-7549
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7549
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 0.23.0
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>             Fix For: 2.0.0-alpha
>
>         Attachments: HADOOP-7549v1.patch, HADOOP-7549v2.patch, HADOOP-7549v3.patch
>
>
> Currently configuring FileSystem implementations must be done by declaring the FileSystem
class in the Hadoop configuration files (core-default.xml, ...).
> Using JDK ServiceLoader mechanism this configuration step can be avoided. Adding the
JAR file with the additional FileSystem implementation would suffice. 
> This is similar to what is being proposed for compression codecs (HADOOP-7350).

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