org.apache.hadoop.hdfs.server.datanode

Class VolumeScanner

java.lang.Object

java.lang.Thread

org.apache.hadoop.hdfs.server.datanode.VolumeScanner

All Implemented Interfaces:

Runnable

public class VolumeScanner
extends Thread

VolumeScanner scans a single volume. Each VolumeScanner has its own thread.

They are all managed by the DataNode's BlockScanner.

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 org.slf4j.Logger	LOG

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Method Summary

Methods

Modifier and Type	Method and Description
void	disableBlockPoolId(String bpid) Disallow the scanner from scanning the given block pool.
void	enableBlockPoolId(String bpid) Allow the scanner to scan the given block pool.
void	markSuspectBlock(org.apache.hadoop.hdfs.protocol.ExtendedBlock block)
void	printStats(StringBuilder p)
void	run()
void	shutdown() Shut down this scanner.
String	toString()

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, yield

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.slf4j.Logger LOG

Method Detail

printStats

public void printStats(StringBuilder p)

run

public void run()

Specified by:

run in interface Runnable

Overrides:

run in class Thread

toString

public String toString()

Overrides:

toString in class Thread

shutdown

public void shutdown()

Shut down this scanner.

markSuspectBlock

public void markSuspectBlock(org.apache.hadoop.hdfs.protocol.ExtendedBlock block)

enableBlockPoolId

public void enableBlockPoolId(String bpid)

Allow the scanner to scan the given block pool.

Parameters:

bpid - The block pool id.

disableBlockPoolId

public void disableBlockPoolId(String bpid)

Disallow the scanner from scanning the given block pool.

Parameters:

bpid - The block pool id.