org.apache.kafka.server.log.remote.storage

Enum RemoteLogSegmentState

java.lang.Object

java.lang.Enum<RemoteLogSegmentState>

org.apache.kafka.server.log.remote.storage.RemoteLogSegmentState

All Implemented Interfaces:

Serializable, Comparable<RemoteLogSegmentState>

@InterfaceStability.Evolving
public enum RemoteLogSegmentState
extends Enum<RemoteLogSegmentState>

This enum indicates the state of the remote log segment. This will be based on the action executed on this segment by the remote log service implementation.

It goes through the below state transitions. Self transition is treated as valid. This allows updating with the same state in case of retries and failover.

 +---------------------+            +----------------------+
 |COPY_SEGMENT_STARTED |----------> |COPY_SEGMENT_FINISHED |
 +-------------------+-+            +--+-------------------+
                     |                 |
                     |                 |
                     v                 v
                  +--+-----------------+-+
                  |DELETE_SEGMENT_STARTED|
                  +-----------+----------+
                              |
                              |
                              v
                  +-----------+-----------+
                  |DELETE_SEGMENT_FINISHED|
                  +-----------------------+
 

Enum Constant Summary

Enum Constants

Enum Constant and Description
COPY_SEGMENT_FINISHED This state indicates that the segment copying to remote storage is finished.
COPY_SEGMENT_STARTED This state indicates that the segment copying to remote storage is started but not yet finished.
DELETE_SEGMENT_FINISHED This state indicates that the segment is deleted successfully.
DELETE_SEGMENT_STARTED This state indicates that the segment deletion is started but not yet finished.

Method Summary

Modifier and Type	Method and Description
static RemoteLogSegmentState	forId(byte id)
byte	id()
static boolean	isValidTransition(RemoteLogSegmentState srcState, RemoteLogSegmentState targetState)
static RemoteLogSegmentState	valueOf(String name) Returns the enum constant of this type with the specified name.
static RemoteLogSegmentState[]	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_SEGMENT_STARTED

public static final RemoteLogSegmentState COPY_SEGMENT_STARTED

This state indicates that the segment copying to remote storage is started but not yet finished.

COPY_SEGMENT_FINISHED

public static final RemoteLogSegmentState COPY_SEGMENT_FINISHED

This state indicates that the segment copying to remote storage is finished.

DELETE_SEGMENT_STARTED

public static final RemoteLogSegmentState DELETE_SEGMENT_STARTED

This state indicates that the segment deletion is started but not yet finished.

DELETE_SEGMENT_FINISHED

public static final RemoteLogSegmentState DELETE_SEGMENT_FINISHED

This state indicates that the segment is deleted successfully.

Method Detail

values

public static RemoteLogSegmentState[] 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 (RemoteLogSegmentState c : RemoteLogSegmentState.values())
    System.out.println(c);

Returns:

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

valueOf

public static RemoteLogSegmentState valueOf(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:

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

NullPointerException - if the argument is null

id

public byte id()

forId

public static RemoteLogSegmentState forId(byte id)

isValidTransition

public static boolean isValidTransition(RemoteLogSegmentState srcState,
                                        RemoteLogSegmentState targetState)