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https://issues.apache.org/jira/browse/HADOOP-15302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395257#comment-16395257
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Steve Loughran commented on HADOOP-15302:
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OK...I think the main thing for me is that the specific plugin failing to load
is printed. Ideally class and URL of class which fails. Classpaths are the
enemy of plugins.
You'll have to get someone who works in HDFS to review this I'm afraid, not me.
> Enable DataNode/NameNode service plugins with Service Provider interface
> ------------------------------------------------------------------------
>
> Key: HADOOP-15302
> URL: https://issues.apache.org/jira/browse/HADOOP-15302
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Elek, Marton
> Assignee: Elek, Marton
> Priority: Major
> Attachments: HADOOP-15302.001.patch, HADOOP-15302.002.patch
>
>
> HADOOP-5257 introduced ServicePlugin capabilities for NameNode/DataNode. As
> of now they could be activated by configuration values.
> I propose to activate plugins with Service Provider Interface. In case of a
> special service file is added a jar it would be enough to add the plugin to
> the classpath. It would help to add optional components to NameNode/DataNode
> with settings the classpath.
> This is the same api which could be used in java 9 to consume defined
> services.
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