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- FileSetProperties.setUseExisting(true) (or DATA_USE_EXISTING / "data.use.existing") to reuse an existing location and Hive table. The dataset will assume that it does not own the existing data in that location and Hive table, and therefore, when you delete or truncate the dataset, the data will not be deleted.
- FileSetProperties.setPossessExisting(true) (or DATA_POSSESS_EXISTING / "data.possess.existing") to assume ownership an existing location and Hive table. The dataset will assume that it owns the existing data in that location and Hive table, and therefore, when you delete or truncate the dataset, all data will be deleted, including the previously existing data and Hive partitions.
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To support app level impersonation wherein application, datasets and streams can have their own owner and the operation performed in CDAP should impersonated their respective owner CDAP should have access to the owner principal and their associated keytabs. Owner principals of an entity is provided during the entity creation step (see REST APIs documentation in next section). CDAP expect