Sebastian Nagel commented on NUTCH-2727:

It turns out, there is one obstacle: recent Hadoop versions switched to use 
okhttp which raises a version conflict in the okhttp/okio dependency during 
unit test execution. A trivial dependency exclusion may fix this. However, 
ideally, the unit tests should load the class using the plugin class loader 
anyway. I'll try to resolve this point.

> Upgrade Hadoop dependencies to 2.9.2
> ------------------------------------
>                 Key: NUTCH-2727
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2727
>             Project: Nutch
>          Issue Type: Improvement
>    Affects Versions: 1.15
>            Reporter: Sebastian Nagel
>            Priority: Major
>             Fix For: 1.16
> The latest upgrade of the Hadoop dependency dates back to Dec 2017 
> (NUTCH-2354). We might upgrade to the latest version of Hadoop 2.x (2.9.2).
> Note: Nutch 1.15 (or master) built with Hadoop 2.7.4 runs seamlessly on 
> Hadoop 3.x. This should be also the case for 2.9.4 (to be tested), so we 
> still might wait for the final upgrade to Hadoop 3.x to ensure 
> backward-compatibility.

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