Elek, Marton commented on HADOOP-15302:

Good question: but the current behaviour is not changed:

1. In case of an execption in the constructor of the plugin datanode/namenode 
can't be started
2. In case of an exception in the start method LOG.warn is used (with the 
plugin name and exception) but the datanode/namenode will be started.

> 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-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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