ajantha-bhat commented on code in PR #8857:
URL: https://github.com/apache/iceberg/pull/8857#discussion_r1364768700
##########
nessie/src/main/java/org/apache/iceberg/nessie/NessieIcebergClient.java:
##########
@@ -181,21 +182,76 @@ public IcebergTable table(TableIdentifier
tableIdentifier) {
}
public void createNamespace(Namespace namespace, Map<String, String>
metadata) {
+ getRef().checkMutable();
+
+ if (namespace.isEmpty()) {
+ throw new IllegalArgumentException("Creating empty namespaces is not
supported");
+ }
+
+ ContentKey key = ContentKey.of(namespace.levels());
+ org.projectnessie.model.Namespace content =
+ org.projectnessie.model.Namespace.of(key.getElements(), metadata);
+
try {
- getRef().checkMutable();
- withReference(
- getApi()
- .createNamespace()
-
.namespace(org.projectnessie.model.Namespace.of(namespace.levels()))
- .properties(metadata))
- .create();
- refresh();
- } catch (NessieNamespaceAlreadyExistsException e) {
- throw new AlreadyExistsException(e, "Namespace already exists: %s",
namespace);
+
+ // First, check that the namespace doesn't exist at the current hash;
+ // this will avoid a NessieBadRequestException when committing the
namespace creation
+ Reference ref = getReference();
+ Map<ContentKey, Content> contentMap =
api.getContent().reference(ref).key(key).get();
+ Content existing = contentMap.get(key);
+ if (existing != null) {
+ if (existing instanceof org.projectnessie.model.Namespace) {
+ throw new AlreadyExistsException("Namespace already exists: '%s'",
namespace);
+ } else {
+ throw new AlreadyExistsException(
Review Comment:
nit: we can check the instance of view or table and make the error message
to be clear as Table or view already exist.
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