org.apache.drill.yarn.appMaster

Enum ClusterControllerImpl.State

java.lang.Object

java.lang.Enum<ClusterControllerImpl.State>

org.apache.drill.yarn.appMaster.ClusterControllerImpl.State

All Implemented Interfaces:

Serializable, Comparable<ClusterControllerImpl.State>

Enclosing class:

ClusterControllerImpl

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

Controller lifecycle state.

Enum Constant Summary

Enum Constants

Enum Constant and Description
ENDED The controller has shut down.
ENDING Controller is shutting down.
FAILED Something bad happened on start-up; the AM can't start and must shut down.
LIVE Normal operating state: the controller seeks to maintain the desired number of tasks.
START Cluster is starting.

Method Summary

Modifier and Type	Method and Description
static ClusterControllerImpl.State	valueOf(String name) Returns the enum constant of this type with the specified name.
static ClusterControllerImpl.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, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

START

public static final ClusterControllerImpl.State START

Cluster is starting. Things are in a partially-built state. No tasks are started until the cluster moves to LIVE.

LIVE

public static final ClusterControllerImpl.State LIVE

Normal operating state: the controller seeks to maintain the desired number of tasks.

ENDING

public static final ClusterControllerImpl.State ENDING

Controller is shutting down. Tasks are gracefully (where possible) ended; no new tasks are started. (That is, when we detect the exit of a task, the controller no longer immediately tries to start a replacement.

ENDED

public static final ClusterControllerImpl.State ENDED

The controller has shut down. All tasks and threads are stopped. The controller allows the main thread (which has been patiently waiting) to continue, allowing the AM itself to shut down. Thus, this is a very short-lived state.

FAILED

public static final ClusterControllerImpl.State FAILED

Something bad happened on start-up; the AM can't start and must shut down.

Method Detail

values

public static ClusterControllerImpl.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 (ClusterControllerImpl.State c : ClusterControllerImpl.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 ClusterControllerImpl.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