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https://issues.apache.org/jira/browse/SOLR-14660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17480178#comment-17480178
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Kevin Risden commented on SOLR-14660:
-------------------------------------

The HDFS integration isn't THAT complicated. 99% of the crap to deal with is 
the integration tests. The directory factory, block cache, and other classes - 
are reasonably simple to understand. Most of the integration tests suck due to 
the dependencies, configs, and how heavy the HDFS namenode/datanode processes 
are. So conceptually it works really well for read so querying against a 
relatively static index works - indexing is questionable from a performance 
standpoint but again its just a simple directory -> hdfs filesystem.

The module quality is an interesting question - I personally haven't tried the 
module, but since its just a move it should be the same as above. Nothing 
conceptually changed just the file locations and build configs.

So yea even though the HDFS code module hasn't gotten much attention - the core 
functionality hasn't really been touched since its "complete" - its mostly in 
the integration test code.

> Migrating HDFS into a module
> ----------------------------
>
>                 Key: SOLR-14660
>                 URL: https://issues.apache.org/jira/browse/SOLR-14660
>             Project: Solr
>          Issue Type: Improvement
>          Components: Hadoop Integration, Plugin system
>            Reporter: Ishan Chattopadhyaya
>            Priority: Blocker
>              Labels: package, packagemanager
>             Fix For: 9.0
>
>          Time Spent: 3h 10m
>  Remaining Estimate: 0h
>
> Following up on the deprecation of HDFS (SOLR-14021), we need to work on 
> isolating it away from Solr core and making a package for this. This issue is 
> to track the efforts for that.



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