org.apache.iceberg

Class StaticTableOperations

java.lang.Object

org.apache.iceberg.StaticTableOperations

All Implemented Interfaces:

TableOperations

public class StaticTableOperations
extends java.lang.Object
implements TableOperations

TableOperations implementation that provides access to metadata for a Table at some point in time, using a table metadata location. It will never refer to a different Metadata object than the one it was created with and cannot be used to create or delete files.

Constructor Summary

Constructors

Constructor and Description
StaticTableOperations(java.lang.String metadataFileLocation, FileIO io) Creates a StaticTableOperations tied to a specific static version of the TableMetadata
StaticTableOperations(java.lang.String metadataFileLocation, FileIO io, LocationProvider locationProvider)

Method Summary

Modifier and Type	Method and Description
void	commit(TableMetadata base, TableMetadata metadata) Replace the base table metadata with a new version.
TableMetadata	current() Return the currently loaded table metadata, without checking for updates.
FileIO	io() Returns a FileIO to read and write table data and metadata files.
LocationProvider	locationProvider() Returns a LocationProvider that supplies locations for new new data files.
java.lang.String	metadataFileLocation(java.lang.String fileName) Given the name of a metadata file, obtain the full path of that file using an appropriate base location of the implementation's choosing.
TableMetadata	refresh() StaticTableOperations works on the same version of TableMetadata, and it will never refer a different TableMetadata object than the one it was created with.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.iceberg.TableOperations

encryption, newSnapshotId, temp

Constructor Detail

StaticTableOperations

public StaticTableOperations(java.lang.String metadataFileLocation,
                             FileIO io)

Creates a StaticTableOperations tied to a specific static version of the TableMetadata

StaticTableOperations

public StaticTableOperations(java.lang.String metadataFileLocation,
                             FileIO io,
                             LocationProvider locationProvider)

Method Detail

current

public TableMetadata current()

Description copied from interface: TableOperations

Return the currently loaded table metadata, without checking for updates.

Specified by:

current in interface TableOperations

Returns:

table metadata

refresh

public TableMetadata refresh()

StaticTableOperations works on the same version of TableMetadata, and it will never refer a different TableMetadata object than the one it was created with.

Specified by:

refresh in interface TableOperations

Returns:

always current().

commit

public void commit(TableMetadata base,
                   TableMetadata metadata)

Description copied from interface: TableOperations

Replace the base table metadata with a new version.

This method should implement and document atomicity guarantees.

Implementations must check that the base metadata is current to avoid overwriting updates. Once the atomic commit operation succeeds, implementations must not perform any operations that may fail because failure in this method cannot be distinguished from commit failure.

Implementations must throw a CommitStateUnknownException in cases where it cannot be determined if the commit succeeded or failed. For example if a network partition causes the confirmation of the commit to be lost, the implementation should throw a CommitStateUnknownException. This is important because downstream users of this API need to know whether they can clean up the commit or not, if the state is unknown then it is not safe to remove any files. All other exceptions will be treated as if the commit has failed.

Specified by:

commit in interface TableOperations

Parameters:

base - table metadata on which changes were based

metadata - new table metadata with updates

io

public FileIO io()

Description copied from interface: TableOperations

Returns a FileIO to read and write table data and metadata files.

Specified by:

io in interface TableOperations

metadataFileLocation

public java.lang.String metadataFileLocation(java.lang.String fileName)

Description copied from interface: TableOperations

Given the name of a metadata file, obtain the full path of that file using an appropriate base location of the implementation's choosing.

The file may not exist yet, in which case the path should be returned as if it were to be created by e.g. FileIO.newOutputFile(String).

Specified by:

metadataFileLocation in interface TableOperations

locationProvider

public LocationProvider locationProvider()

Description copied from interface: TableOperations

Returns a LocationProvider that supplies locations for new new data files.

Specified by:

locationProvider in interface TableOperations

Returns:

a location provider configured for the current table state