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https://issues.apache.org/jira/browse/SOLR-16697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anshum Gupta updated SOLR-16697:
--------------------------------
    Priority: Major  (was: Blocker)

> New API support to import index files generated by Embedded SOLR into SOLR 
> Cloud
> --------------------------------------------------------------------------------
>
>                 Key: SOLR-16697
>                 URL: https://issues.apache.org/jira/browse/SOLR-16697
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Backup/Restore
>            Reporter: Indumathy Rajagopalan
>            Priority: Major
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Offline indexing is a popular option when really large data sets needs to be 
> indexed into SOLR. 
> Data is loaded from data source ( eg. c*)  and index creation pipelines 
> produce index files per shard using embedded SOLR.
>  
> With older versions of SOLR, we would copy these index files into SOLR Cloud 
> data directories using a custom tools and reload the collection to be able to 
> search/update on the newly uploaded collection.
> Ideally, we should use the Restore API to import the index files from backup 
> repository. However, the file structure expected for the Restore API to work 
> is complex enough that massaging the index files in every shard into Restore 
> compatible format is infeasible.
>  
> It would be good for SOLR to support a 'Restore' like API that would allow us 
> to import index files generated by embedded SOLR into SOLR Cloud ? This API 
> should operate on shard level and be able to import the index files into a 
> single shard (per invocation)
>  
> *With the new API , offline indexing could look like this :* 
>  
> 1. Generate index files per shard using embedded SOLR as a part of hadoop MR 
> /Spark jobs  and copy all index files for every shard into backup repository.
>  
> 2. The New API should be able to import the index from backup repository 
> location into each shard on SOLR Cloud. The API would handle things like 
> marking the collection as read-only, trigger replication etc. along the lines 
> of what the 'RESTORE' API currently does.
>  
> The new API should be able to support relevant parameters from Restore API ( 
> location & repository )



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