Package org.apache.hadoop.fs

Class DelegationTokenRenewer

java.lang.Object

java.lang.Thread

org.apache.hadoop.fs.DelegationTokenRenewer

All Implemented Interfaces:

java.lang.Runnable

@Private
public class DelegationTokenRenewer
extends java.lang.Thread

A daemon thread that waits for the next file system to renew.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	DelegationTokenRenewer.Renewable	The renewable interface used by the renewer.
static class	DelegationTokenRenewer.RenewAction<T extends FileSystem & DelegationTokenRenewer.Renewable>	An action that will renew and replace the file system's delegation tokens automatically.

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

java.lang.Thread.State, java.lang.Thread.UncaughtExceptionHandler

Field Summary

Fields

Modifier and Type	Field	Description
static long	renewCycle

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Method Summary

Modifier and Type	Method	Description
<T extends FileSystem & DelegationTokenRenewer.Renewable> DelegationTokenRenewer.RenewAction<T>	addRenewAction(T fs)	Add a renew action to the queue.
static DelegationTokenRenewer	getInstance()
protected int	getRenewQueueLength()	For testing purposes.
<T extends FileSystem & DelegationTokenRenewer.Renewable> void	removeRenewAction(T fs)	Remove the associated renew action from the queue
void	run()

Methods inherited from class java.lang.Thread

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

Methods inherited from class java.lang.Object

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

Field Detail

renewCycle

@Private
@VisibleForTesting
public static long renewCycle

Method Detail

getRenewQueueLength

@VisibleForTesting
protected int getRenewQueueLength()

For testing purposes.

Returns:

renew queue length.

getInstance

public static DelegationTokenRenewer getInstance()

addRenewAction

public <T extends FileSystem & DelegationTokenRenewer.Renewable> DelegationTokenRenewer.RenewAction<T> addRenewAction(T fs)

Add a renew action to the queue.

Type Parameters:

T - generic type T.

Parameters:

fs - file system.

Returns:

renew action.

removeRenewAction

public <T extends FileSystem & DelegationTokenRenewer.Renewable> void removeRenewAction(T fs)
                                                                                 throws java.io.IOException

Remove the associated renew action from the queue

Type Parameters:

T - generic type T.

Parameters:

fs - file system.

Throws:

java.io.IOException - raised on errors performing I/O.

run

public void run()

Specified by:

run in interface java.lang.Runnable

Overrides:

run in class java.lang.Thread