Package org.apache.iceberg

Enum Class RowLevelOperationMode

java.lang.Object

java.lang.Enum<RowLevelOperationMode>

org.apache.iceberg.RowLevelOperationMode

All Implemented Interfaces:

Serializable, Comparable<RowLevelOperationMode>, Constable

public enum RowLevelOperationMode
extends Enum<RowLevelOperationMode>

Iceberg supports two ways to modify records in a table: copy-on-write and merge-on-read.

In copy-on-write, changes are materialized immediately and matching data files are replaced with new data files that represent the new table state. For example, if there is a record that has to be deleted, the data file that contains this record has to be replaced with another data file without that record. All unchanged rows have to be copied over to the new data file.

In merge-on-read, changes aren't materialized immediately. Instead, IDs of deleted and updated records are written into delete files that are applied during reads and updated/inserted records are written into new data files that are committed together with the delete files.

Copy-on-write changes tend to consume more time and resources during writes but don't introduce any performance overhead during reads. Merge-on-read operations, on the other hand, tend to be much faster during writes but require more time and resources to apply delete files during reads.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
COPY_ON_WRITE
MERGE_ON_READ

Method Summary

Modifier and Type	Method	Description
static RowLevelOperationMode	fromName(String modeName)
String	modeName()
static RowLevelOperationMode	valueOf(String name)	Returns the enum constant of this class with the specified name.
static RowLevelOperationMode[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

COPY_ON_WRITE

public static final RowLevelOperationMode COPY_ON_WRITE

MERGE_ON_READ

public static final RowLevelOperationMode MERGE_ON_READ

Method Details

values

public static RowLevelOperationMode[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static RowLevelOperationMode valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null

fromName

public static RowLevelOperationMode fromName(String modeName)

modeName

public String modeName()