Package org.apache.solr.common.cloud

Enum Replica.State

java.lang.Object

java.lang.Enum<Replica.State>

org.apache.solr.common.cloud.Replica.State

All Implemented Interfaces:

Serializable, Comparable<Replica.State>

Enclosing class:

Replica

public static enum Replica.State
extends Enum<Replica.State>

The replica's state. In general, if the node the replica is hosted on is not under /live_nodes in ZK, the replica's state should be discarded.

Enum Constant Summary

Enum Constants

Enum Constant	Description
ACTIVE	The replica is ready to receive updates and queries.
DOWN	The first state before RECOVERING.
RECOVERING	The node is recovering from the leader.
RECOVERY_FAILED	Recovery attempts have not worked, something is not right.

Field Summary

Fields

Modifier and Type	Field	Description
String	shortName	short name for a state.

Method Summary

Modifier and Type	Method	Description
static Replica.State	getState(String stateStr)	Converts the state string to a State instance.
String	toString()
static Replica.State	valueOf(String name)	Returns the enum constant of this type with the specified name.
static Replica.State[]	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, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

ACTIVE

public static final Replica.State ACTIVE

The replica is ready to receive updates and queries.

NOTE: when the node the replica is hosted on crashes, the replica's state may remain ACTIVE in ZK. To determine if the replica is truly active, you must also verify that its node is under /live_nodes in ZK (or use ClusterState.liveNodesContain(String)).

DOWN

public static final Replica.State DOWN

The first state before RECOVERING. A node in this state should be actively trying to move to RECOVERING.

NOTE: a replica's state may appear DOWN in ZK also when the node it's hosted on gracefully shuts down. This is a best effort though, and should not be relied on.

RECOVERING

public static final Replica.State RECOVERING

The node is recovering from the leader. This might involve peer-sync, full replication or finding out things are already in sync.

RECOVERY_FAILED

public static final Replica.State RECOVERY_FAILED

Recovery attempts have not worked, something is not right.

NOTE: This state doesn't matter if the node is not part of /live_nodes in ZK; in that case the node is not part of the cluster and it's state should be discarded.

Field Detail

shortName

public final String shortName

short name for a state. Used to encode this in the state node see PerReplicaStates.State

Method Detail

values

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

Returns:

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

valueOf

public static Replica.State 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

toString

public String toString()

Overrides:

toString in class Enum<Replica.State>

getState

public static Replica.State getState(String stateStr)

Converts the state string to a State instance.