How to delete a catalog

When you delete a catalog, the catalog's metadata and all layers are deleted.
Before deleting a catalog, consider reviewing the usage information for the
catalog to make sure no processes, such as pipelines, depend on the catalog. If
you delete a catalog that is used by a process like a pipeline, you will break
the process. For information on viewing usage information, see the
Logs, Monitoring and Alerts User Guide.

To delete a catalog, use the AdminApi provided by the data-client module.
The only required parameter is the HRN of the catalog:

adminApi.deleteCatalog(catalogHrn).flatMap { _ =>
  log.info(s"deleted $catalogHrn")
  Future.successful(catalogHrn)
}

CompletionStage<CompletionStage<HRN>> deletionStage =
    adminApi
        .deleteCatalog(catalogHrn)
        .thenApply(
            done -> {
              log.info("deleted `" + catalogHrn + "`");
              CompletableFuture<HRN> retval = new CompletableFuture<HRN>();
              retval.complete(catalogHrn);
              return retval;
            });

Warning

Data loss
Once a catalog is deleted, all the associated data and metadata is also
deleted. There is no mechanism to undo the operation. Therefore, this should
be done with caution.