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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 Fri, 26 Oct 2012 19:25:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485135#comment-13485135
] 

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

Hi Alejandro,

I was calling FileSystem.get(URI, conf, user) from C++ code through JNI.  After upgrading
to 2.0, this call is giving me "java.util.ServiceConfigurationError: org.apache.hadoop.fs.FileSystem:
Provider org.apache.hadoop.fs.LocalFileSystem not found" error.  It doesn't seem to be a classpath
issue, since I can instantiate the class with no problem.  I'd like to know whether you have
any insight on this.

Also I read in the bug that there's a configuration to disable loading through ServiceLoader.
 I'd like to try that, and would appreciate if you could let me know what's the proper way
to do that.

Thanks,
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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