org.apache.gravitino

Interface SupportsCatalogs

All Known Implementing Classes:

GravitinoClient, GravitinoMetalake

@Evolving
public interface SupportsCatalogs

Client interface for supporting catalogs. It includes methods for listing, loading, creating, altering and dropping catalogs.

Method Summary

Modifier and Type	Method and Description
Catalog	alterCatalog(java.lang.String catalogName, CatalogChange... changes) Alter a catalog with specified catalog name and changes.
default boolean	catalogExists(java.lang.String catalogName) Check if a catalog exists.
Catalog	createCatalog(java.lang.String catalogName, Catalog.Type type, java.lang.String provider, java.lang.String comment, java.util.Map<java.lang.String,java.lang.String> properties) Create a catalog with specified catalog name, type, provider, comment, and properties.
void	disableCatalog(java.lang.String catalogName) Disable a catalog.
default boolean	dropCatalog(java.lang.String catalogName) Drop a catalog with specified name.
boolean	dropCatalog(java.lang.String catalogName, boolean force) Drop a catalog with specified name.
void	enableCatalog(java.lang.String catalogName) Enable a catalog.
java.lang.String[]	listCatalogs() List the name of all catalogs in the metalake.
Catalog[]	listCatalogsInfo() List all catalogs with their information in the metalake.
Catalog	loadCatalog(java.lang.String catalogName) Load a catalog by its name.
void	testConnection(java.lang.String catalogName, Catalog.Type type, java.lang.String provider, java.lang.String comment, java.util.Map<java.lang.String,java.lang.String> properties) Test whether the catalog with specified parameters can be connected to before creating it.

Method Detail

listCatalogs

java.lang.String[] listCatalogs()
                         throws NoSuchMetalakeException

List the name of all catalogs in the metalake.

Returns:

The list of catalog's names.

Throws:

NoSuchMetalakeException - If the metalake does not exist.

listCatalogsInfo

Catalog[] listCatalogsInfo()
                    throws NoSuchMetalakeException

List all catalogs with their information in the metalake.

Returns:

The list of catalog's information.

Throws:

NoSuchMetalakeException - If the metalake with namespace does not exist.

loadCatalog

Catalog loadCatalog(java.lang.String catalogName)
             throws NoSuchCatalogException

Load a catalog by its name.

Parameters:

catalogName - the name of the catalog.

Returns:

The catalog.

Throws:

NoSuchCatalogException - If the catalog does not exist.

catalogExists

default boolean catalogExists(java.lang.String catalogName)

Check if a catalog exists.

Parameters:

catalogName - The name of the catalog.

Returns:

True if the catalog exists, false otherwise.

createCatalog

Catalog createCatalog(java.lang.String catalogName,
                      Catalog.Type type,
                      java.lang.String provider,
                      java.lang.String comment,
                      java.util.Map<java.lang.String,java.lang.String> properties)
               throws NoSuchMetalakeException,
                      CatalogAlreadyExistsException

Create a catalog with specified catalog name, type, provider, comment, and properties.

The parameter "provider" is a short name of the catalog, used to tell Gravitino which catalog should be created. The short name should be the same as the CatalogProvider interface provided.

Parameters:

catalogName - the name of the catalog.

type - the type of the catalog.

provider - the provider of the catalog.

comment - the comment of the catalog.

properties - the properties of the catalog.

Returns:

The created catalog.

Throws:

NoSuchMetalakeException - If the metalake does not exist.

CatalogAlreadyExistsException - If the catalog already exists.

alterCatalog

Catalog alterCatalog(java.lang.String catalogName,
                     CatalogChange... changes)
              throws NoSuchCatalogException,
                     java.lang.IllegalArgumentException

Alter a catalog with specified catalog name and changes.

Parameters:

catalogName - the name of the catalog.

changes - the changes to apply to the catalog.

Returns:

The altered catalog.

Throws:

NoSuchCatalogException - If the catalog does not exist.

java.lang.IllegalArgumentException - If the changes cannot be applied to the catalog.

dropCatalog

default boolean dropCatalog(java.lang.String catalogName)
                     throws NonEmptyEntityException,
                            CatalogInUseException

Drop a catalog with specified name. Please make sure:

• There is no schema in the catalog. Otherwise, a NonEmptyEntityException will be thrown.
• The method disableCatalog(String) has been called before dropping the catalog. Otherwise, a CatalogInUseException will be thrown.

It is equivalent to calling dropCatalog(ident, false).

Parameters:

catalogName - the name of the catalog.

Returns:

True if the catalog was dropped, false if the catalog does not exist.

Throws:

NonEmptyEntityException - If the catalog is not empty.

CatalogInUseException - If the catalog is in use.

dropCatalog

boolean dropCatalog(java.lang.String catalogName,
                    boolean force)
             throws NonEmptyEntityException,
                    CatalogInUseException

Drop a catalog with specified name. If the force flag is true, it will:

• Cascade drop all sub-entities (schemas, tables, etc.) of the catalog in Gravitino store.
• Drop the catalog even if it is in use.
• External resources (e.g. database, table, etc.) associated with sub-entities will not be dropped unless it is managed (such as managed fileset).

If the force flag is false, it is equivalent to calling dropCatalog(String).

Parameters:

catalogName - The identifier of the catalog.

force - Whether to force the drop.

Returns:

True if the catalog was dropped, false if the catalog does not exist.

Throws:

NonEmptyEntityException - If the catalog is not empty and force is false.

CatalogInUseException - If the catalog is in use and force is false.

enableCatalog

void enableCatalog(java.lang.String catalogName)
            throws NoSuchCatalogException

Enable a catalog. If the catalog is already enabled, this method does nothing.

Parameters:

catalogName - The identifier of the catalog.

Throws:

NoSuchCatalogException - If the catalog does not exist.

disableCatalog

void disableCatalog(java.lang.String catalogName)
             throws NoSuchCatalogException

Disable a catalog. If the catalog is already disabled, this method does nothing. Once a catalog is disabled:

• It can only be listed, loaded, dropped, or disable.
• Any other operations on the catalog will throw an CatalogNotInUseException.
• Any operation on the sub-entities (schemas, tables, etc.) will throw an CatalogNotInUseException.

Parameters:

catalogName - The identifier of the catalog.

Throws:

NoSuchCatalogException - If the catalog does not exist.

testConnection

void testConnection(java.lang.String catalogName,
                    Catalog.Type type,
                    java.lang.String provider,
                    java.lang.String comment,
                    java.util.Map<java.lang.String,java.lang.String> properties)
             throws java.lang.Exception

Test whether the catalog with specified parameters can be connected to before creating it.

Parameters:

catalogName - the name of the catalog.

type - the type of the catalog.

provider - the provider of the catalog.

comment - the comment of the catalog.

properties - the properties of the catalog.

Throws:

java.lang.Exception - if the test failed.