Package org.apache.iceberg

Enum Class IsolationLevel

java.lang.Object

java.lang.Enum<IsolationLevel>

org.apache.iceberg.IsolationLevel

All Implemented Interfaces:

Serializable, Comparable<IsolationLevel>, Constable

public enum IsolationLevel
extends Enum<IsolationLevel>

An isolation level in a table.

Two isolation levels are supported: serializable and snapshot isolation. Both of them provide a read consistent view of the table to all operations and allow readers to see only already committed data. While serializable is the strongest isolation level in databases, snapshot isolation is beneficial for environments with many concurrent writers.

The serializable isolation level guarantees that an ongoing UPDATE/DELETE/MERGE operation fails if a concurrent transaction commits a new file that might contain rows matching the condition used in UPDATE/DELETE/MERGE. For example, if there is an ongoing update on a subset of rows and a concurrent transaction adds a new file with records that potentially match the update condition, the update operation must fail under the serializable isolation but can still commit under the snapshot isolation.

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
SERIALIZABLE
SNAPSHOT

Method Summary

Modifier and Type	Method	Description
static IsolationLevel	fromName(String levelName)
static IsolationLevel	valueOf(String name)	Returns the enum constant of this class with the specified name.
static IsolationLevel[]	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

SERIALIZABLE

public static final IsolationLevel SERIALIZABLE

SNAPSHOT

public static final IsolationLevel SNAPSHOT

Method Details

values

public static IsolationLevel[] 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 IsolationLevel 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 IsolationLevel fromName(String levelName)