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https://issues.apache.org/jira/browse/SOLR-9055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267808#comment-15267808
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Hrishikesh Gadre commented on SOLR-9055:
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>>However if we want to keep things simple, we can choose to not provide 
>>separate APIs to configure "repositories". Instead we can just pick the same 
>>file-system used to store the indexed data. That means in case of local 
>>file-system, the backup will be stored on shared file-system using 
>>SimpleFSDirectory implementation AND for HDFS we will use HdfsDirectory impl. 
>>Make sense?

I think the main problem here is identifying type of file-system used for a 
given collection at the Overseer (The solr core on the other hand already has a 
Directory factory reference. So we can instantiate appropriate directory in the 
snapshooter). 

> 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
>         Attachments: 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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