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https://issues.apache.org/jira/browse/SOLR-9055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269647#comment-15269647
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Gregory Chanan commented on SOLR-9055:
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bq. Any thoughts on this one Mark Miller or Gregory Chanan perhaps?

I agree with Hrishikesh's take here.  In addition to the third party library 
issue, HDFS does not in general support all the local file system APIs you'd 
expect.  I don't know if there are issues with nio specifically, but two 
examples in the past have been truncate and directory sync.

> Make collection backup/restore extensible
> -----------------------------------------
>
>                 Key: SOLR-9055
>                 URL: https://issues.apache.org/jira/browse/SOLR-9055
>             Project: Solr
>          Issue Type: Task
>            Reporter: Hrishikesh Gadre
>            Assignee: Mark Miller
>         Attachments: SOLR-9055.patch, SOLR-9055.patch
>
>
> SOLR-5750 implemented backup/restore API for Solr. This JIRA is to track the 
> code cleanup/refactoring. Specifically following improvements should be made,
> - Add Solr/Lucene version to check the compatibility between the backup 
> version and the version of Solr on which it is being restored.
> - Add a backup implementation version to check the compatibility between the 
> "restore" implementation and backup format.
> - Introduce a Strategy interface to define how the Solr index data is backed 
> up (e.g. using file copy approach).
> - Introduce a Repository interface to define the file-system used to store 
> the backup data. (currently works only with local file system but can be 
> extended). This should be enhanced to introduce support for "registering" 
> repositories (e.g. HDFS, S3 etc.)



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