org.apache.hadoop.hbase.master

Class MasterInitializationMonitor

java.lang.Object

java.lang.Thread

org.apache.hadoop.hbase.master.MasterInitializationMonitor

All Implemented Interfaces:

Runnable

@InterfaceAudience.Private
class MasterInitializationMonitor
extends Thread

Protection against zombie master. Started once Master accepts active responsibility and starts taking over responsibilities. Allows a finite time window before giving up ownership.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	HALT_DEFAULT
static String	HALT_KEY When timeout expired and initialization has not complete, call System.exit(int) when true, do nothing otherwise.
private boolean	haltOnTimeout
private static org.slf4j.Logger	LOG
private HMaster	master
private long	timeout
static long	TIMEOUT_DEFAULT
static String	TIMEOUT_KEY The amount of time in milliseconds to sleep before checking initialization status.

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor and Description
MasterInitializationMonitor(HMaster master) Creates a Thread that monitors the #isInitialized() state.

Method Summary

Modifier and Type	Method and Description
void	run()

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

LOG

private static final org.slf4j.Logger LOG

TIMEOUT_KEY

public static final String TIMEOUT_KEY

The amount of time in milliseconds to sleep before checking initialization status.

See Also:

Constant Field Values

TIMEOUT_DEFAULT

public static final long TIMEOUT_DEFAULT

HALT_KEY

public static final String HALT_KEY

When timeout expired and initialization has not complete, call System.exit(int) when true, do nothing otherwise.

See Also:

Constant Field Values

HALT_DEFAULT

public static final boolean HALT_DEFAULT

See Also:

Constant Field Values

master

private final HMaster master

timeout

private final long timeout

haltOnTimeout

private final boolean haltOnTimeout

Constructor Detail

MasterInitializationMonitor

MasterInitializationMonitor(HMaster master)

Creates a Thread that monitors the #isInitialized() state.

Method Detail

run

public void run()

Specified by:

run in interface Runnable

Overrides:

run in class Thread