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https://issues.apache.org/jira/browse/CARBONDATA-2428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacky Li resolved CARBONDATA-2428.
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Resolution: Fixed
Fix Version/s: 1.4.1
1.5.0
> Support Flat folder structure in carbon.
> ----------------------------------------
>
> Key: CARBONDATA-2428
> URL: https://issues.apache.org/jira/browse/CARBONDATA-2428
> Project: CarbonData
> Issue Type: Improvement
> Reporter: Ravindra Pesala
> Priority: Major
> Fix For: 1.5.0, 1.4.1
>
> Time Spent: 11h
> Remaining Estimate: 0h
>
> 1. Flat folder makes all carbondata files store flat under table path.
> 2. It is controlled through table property `flat_folder`. By default it is
> false.
> 3. It cannot be hybrid, so user cannot change the property once table created.
> 4. Segment file is created for each loading.And segment file is created under
> MetaData folder under table path.
> 5. Segment number is added as part of carbondata and index files.
> 6. All datamap files now create directly under table path with
> <tablepath>/<dmname>/<segment_number>/<task_name>/dm
>
> IUD : It supports but list files during IUD may hit performance.
> Compaction: Supports
> Delete Segment : No impact
> Clean files : No impact
> Alter table : No impact
> Pre Agg : Property need to inherited to child, so it also supports flat
> folder structure.
> Partition : No Impact on this feature as it already has flat folder structure.
> Streaming : Only during handoff it supports flat folder structure. Streaming
> segment location is no change.
>
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