org.apache.iceberg

Enum RowLevelOperationMode

java.lang.Object

java.lang.Enum<RowLevelOperationMode>

org.apache.iceberg.RowLevelOperationMode

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<RowLevelOperationMode>

public enum RowLevelOperationMode
extends java.lang.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.

Enum Constant Summary

Enum Constants

Enum Constant and Description
COPY_ON_WRITE
MERGE_ON_READ

Method Summary

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

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

COPY_ON_WRITE

public static final RowLevelOperationMode COPY_ON_WRITE

MERGE_ON_READ

public static final RowLevelOperationMode MERGE_ON_READ

Method Detail

values

public static RowLevelOperationMode[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (RowLevelOperationMode c : RowLevelOperationMode.values())
    System.out.println(c);

Returns:

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

valueOf

public static RowLevelOperationMode valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

fromName

public static RowLevelOperationMode fromName(java.lang.String modeName)