Package org.apache.hadoop.hdfs.server.datanode

Class DiskBalancerWorkItem

java.lang.Object

org.apache.hadoop.hdfs.server.datanode.DiskBalancerWorkItem

@Private
@Unstable
public class DiskBalancerWorkItem
extends java.lang.Object

Keeps track of how much work has finished.

Constructor Summary

Constructors

Constructor	Description
DiskBalancerWorkItem()	Empty constructor for Json serialization.
DiskBalancerWorkItem(long bytesToCopy, long bytesCopied)	Constructs a DiskBalancerWorkItem.

Method Summary

Modifier and Type	Method	Description
long	getBandwidth()	Max disk bandwidth to use.
long	getBlocksCopied()	Returns number of blocks copied for this DiskBalancerWorkItem.
long	getBytesCopied()	Returns bytes copied so far.
long	getBytesToCopy()	Returns bytes to copy.
java.lang.String	getErrMsg()	Gets the error message.
long	getErrorCount()	Returns the number of errors encountered.
long	getMaxDiskErrors()	Gets maximum disk errors to tolerate before we fail this copy step.
long	getSecondsElapsed()	Gets the number of seconds elapsed from the start time.
long	getStartTime()	Records the Start time of execution.
long	getTolerancePercent()	Allowed deviation from ideal storage in percentage.
void	incBlocksCopied()	increments the number of blocks copied.
void	incCopiedSoFar(long delta)	Increments bytesCopied by delta.
void	incErrorCount()	Incs Error Count.
static DiskBalancerWorkItem	parseJson(java.lang.String json)	Reads a DiskBalancerWorkItem Object from a Json String.
void	setBandwidth(long bandwidth)	Sets max disk bandwidth to use, in MBs per second.
void	setBlocksCopied(long blocksCopied)	Number of blocks copied so far.
void	setBytesCopied(long bytesCopied)	Sets bytes copied so far.
void	setErrMsg(java.lang.String errMsg)	Sets the error message.
void	setErrorCount(long errorCount)	Sets the Error counts for this step.
void	setMaxDiskErrors(long maxDiskErrors)	Sets maximum disk errors to tolerate before we fail this copy step.
void	setSecondsElapsed(long secondsElapsed)	Sets number of seconds elapsed.
void	setStartTime(long startTime)	Sets the Start time.
void	setTolerancePercent(long tolerancePercent)	Sets the tolerance percentage.
java.lang.String	toJson()	returns a serialized json string.

Methods inherited from class java.lang.Object

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

Constructor Detail

DiskBalancerWorkItem

public DiskBalancerWorkItem()

Empty constructor for Json serialization.

DiskBalancerWorkItem

public DiskBalancerWorkItem(long bytesToCopy,
                            long bytesCopied)

Constructs a DiskBalancerWorkItem.

Parameters:

bytesToCopy - - Total bytes to copy from a disk

bytesCopied - - Copied So far.

Method Detail

parseJson

public static DiskBalancerWorkItem parseJson(java.lang.String json)
                                      throws java.io.IOException

Reads a DiskBalancerWorkItem Object from a Json String.

Parameters:

json - - Json String.

Returns:

DiskBalancerWorkItem Object

Throws:

java.io.IOException

getErrMsg

public java.lang.String getErrMsg()

Gets the error message.

setErrMsg

public void setErrMsg(java.lang.String errMsg)

Sets the error message.

Parameters:

errMsg - - Msg.

getErrorCount

public long getErrorCount()

Returns the number of errors encountered.

Returns:

long

incErrorCount

public void incErrorCount()

Incs Error Count.

getBytesCopied

public long getBytesCopied()

Returns bytes copied so far.

Returns:

long

setBytesCopied

public void setBytesCopied(long bytesCopied)

Sets bytes copied so far.

Parameters:

bytesCopied - - long

incCopiedSoFar

public void incCopiedSoFar(long delta)

Increments bytesCopied by delta.

Parameters:

delta - - long

getBytesToCopy

public long getBytesToCopy()

Returns bytes to copy.

Returns:

- long

getBlocksCopied

public long getBlocksCopied()

Returns number of blocks copied for this DiskBalancerWorkItem.

Returns:

long count of blocks.

incBlocksCopied

public void incBlocksCopied()

increments the number of blocks copied.

toJson

public java.lang.String toJson()
                        throws java.io.IOException

returns a serialized json string.

Returns:

String - json

Throws:

java.io.IOException

setErrorCount

public void setErrorCount(long errorCount)

Sets the Error counts for this step.

Parameters:

errorCount - long.

setBlocksCopied

public void setBlocksCopied(long blocksCopied)

Number of blocks copied so far.

Parameters:

blocksCopied - Blocks copied.

getMaxDiskErrors

public long getMaxDiskErrors()

Gets maximum disk errors to tolerate before we fail this copy step.

Returns:

long.

setMaxDiskErrors

public void setMaxDiskErrors(long maxDiskErrors)

Sets maximum disk errors to tolerate before we fail this copy step.

Parameters:

maxDiskErrors - long

getTolerancePercent

public long getTolerancePercent()

Allowed deviation from ideal storage in percentage.

Returns:

long

setTolerancePercent

public void setTolerancePercent(long tolerancePercent)

Sets the tolerance percentage.

Parameters:

tolerancePercent - - tolerance.

getBandwidth

public long getBandwidth()

Max disk bandwidth to use. MB per second.

Returns:

- long.

setBandwidth

public void setBandwidth(long bandwidth)

Sets max disk bandwidth to use, in MBs per second.

Parameters:

bandwidth - - long.

getStartTime

public long getStartTime()

Records the Start time of execution.

Returns:

startTime

setStartTime

public void setStartTime(long startTime)

Sets the Start time.

Parameters:

startTime - - Time stamp for start of execution.

getSecondsElapsed

public long getSecondsElapsed()

Gets the number of seconds elapsed from the start time. The reason why we have this is of time skews. The client's current time may not match with the server time stamp, hence the elapsed second cannot be computed from only startTime.

Returns:

seconds elapsed from start time.

setSecondsElapsed

public void setSecondsElapsed(long secondsElapsed)

Sets number of seconds elapsed. This is updated whenever we update the other counters.

Parameters:

secondsElapsed - - seconds elapsed.