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https://issues.apache.org/jira/browse/HADOOP-7549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208104#comment-13208104
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Alejandro Abdelnur commented on HADOOP-7549:
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@Suresh, If both impls using the same scheme are defined as services, then it
is undetermined (by JDK specs). If one is defined as service an the other in
the configuration, the one in the configuration wins. If both are defined in
the configuration, the latter one wins.
> 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: 0.24.0
>
> Attachments: HADOOP-7549v1.patch, HADOOP-7549v2.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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