[GitHub] [iceberg] lcspinter commented on pull request #2129: Hive: Configure catalog type on table level.

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lcspinter commented on pull request #2129:
URL: https://github.com/apache/iceberg/pull/2129#issuecomment-771698156


   @rdblue I followed your recommendations with a few minor changes.
   
   This is how it works now:
   - If the table has an `iceberg.catalog=<catalog_name>` property then use all the properties prefixed with `iceberg.catalog.<catalog_name>` from the hive global config for catalog instantiation. There is one exception, when `iceberg.catalog=location_based_table`. In this case, no catalog is needed, since we are loading the table based on location.
   - If the table is missing `iceberg.catalog`, fall back to `iceberg.mr.catalog` like you recommended
   
   Previously we supported the so-called "custom" catalogs, and these type of catalogs were instantiated through a catalog loader class (`iceberg.mr.catalog.loader.class`).  The catalog loader class collected all the relevant properties which are important for that specific catalog type and instantiated the catalog. 
   Right now I'm using CatalogUtil.buildIcebergCatalog() to get a catalog instance. This method expects the mandatory catalog specific properties. To assemble this collection I would need to know what properties are required, but since we are talking about a custom catalog, basically this can be anything. In the end, I decided the remove the support of custom catalog configuration through the `iceberg.mr.catalog.loader.class` property.
   Of course, it is still possible to configure custom catalogs, but only through the `iceberg.catalog` table property. This way I know that all the catalog specific parameters are prefixed, and I can pass them to the CatalogUtil.buildIcebergCatalog().
   


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