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https://issues.apache.org/jira/browse/IGNITE-3914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov closed IGNITE-3914.
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> Hadoop: Move HadoopClassLoader to core module.
> ----------------------------------------------
>
> Key: IGNITE-3914
> URL: https://issues.apache.org/jira/browse/IGNITE-3914
> Project: Ignite
> Issue Type: Sub-task
> Components: hadoop
> Affects Versions: 1.7
> Reporter: Vladimir Ozerov
> Assignee: Ivan Veselovsky
> Fix For: 1.8
>
>
> Implementation plan:
> 1) We will use notion of "helper". See {{IgfsHelper}} interface as example to
> get used to existing code base.
> 2) {{HadoopClassLoaderUtils}} must be converted to an interface
> {{HadoopHelper}}. It will have 4 methods - current {{public static}} methods.
> 3) There will be two implementations - {{HadoopNoopHelper}} and
> {{HadoopHelperImpl}}. The first will be located in {{core}} module, the
> second one in {{hadoop}} module.
> 4) {{HadoopHelper}} is wired up with {{GridKernalContextImpl}} in the same
> way as it is done for {{IgfsHelper}}. The only difference is that we will
> instantiate {{HadoopHelperImpl}} if Hadoop module is in the classpath. See
> other components initialization logic for reference.
> 5) {{HadoopClassLoader}} will accept helper in constructor. This will require
> some refactoring to places where it is used (4 currently). The only
> problematic place is {{HadoopV2Job}}.
> 6) As a last step - simply move {{HadoopClassLoader}} to the same package in
> {{core}} module as it doesn't have external dependencies any more.
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