Package org.apache.hadoop.fs.azurebfs.services

Class AbfsInputStreamStatisticsImpl

java.lang.Object

org.apache.hadoop.fs.azurebfs.services.AbfsInputStreamStatisticsImpl

All Implemented Interfaces:

AbfsInputStreamStatistics, org.apache.hadoop.fs.statistics.IOStatisticsSource

public class AbfsInputStreamStatisticsImpl
extends java.lang.Object
implements AbfsInputStreamStatistics

Stats for the AbfsInputStream.

Constructor Summary

Constructors

Constructor	Description
AbfsInputStreamStatisticsImpl()

Method Summary

Modifier and Type	Method	Description
void	bytesRead(long bytes)	Increment the bytes read counter by the number of bytes; no-op if the argument is negative.
void	bytesReadFromBuffer(long bytes)	Record the total bytes read from buffer.
double	getActionHttpGetRequest()	Getter for the mean value of the time taken to complete a HTTP GET request by AbfsInputStream.
long	getBackwardSeekOperations()
long	getBytesBackwardsOnSeek()
long	getBytesRead()
long	getBytesReadFromBuffer()
long	getBytesSkippedOnSeek()
long	getForwardSeekOperations()
org.apache.hadoop.fs.statistics.IOStatistics	getIOStatistics()	Getter for IOStatistics instance used.
long	getReadAheadBytesRead()
long	getReadOperations()
long	getRemoteBytesRead()
long	getRemoteReadOperations()
long	getSeekInBuffer()
long	getSeekOperations()
void	readAheadBytesRead(long bytes)	Total bytes read from readAhead buffer during a read operation.
void	readOperationStarted()	A read(byte[] buf, int off, int len) operation has started.
void	remoteBytesRead(long bytes)	Total bytes read remotely after nothing was read from readAhead buffer.
void	remoteReadOperation()	Records a successful remote read operation.
void	seek(long seekTo, long currentPos)	Record a forward or backward seek, adding a seek operation, a forward or a backward seek operation, and number of bytes skipped.
void	seekBackwards(long negativeOffset)	Seek backwards, incrementing the seek and backward seek counters.
void	seekForwards(long skipped)	Record a forward seek, adding a seek operation, a forward seek operation, and any bytes skipped.
void	seekInBuffer()	Records the total number of seeks done in the buffer.
java.lang.String	toString()	String operator describes all the current statistics.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbfsInputStreamStatisticsImpl

public AbfsInputStreamStatisticsImpl()

Method Detail

seekBackwards

public void seekBackwards(long negativeOffset)

Seek backwards, incrementing the seek and backward seek counters.

Specified by:

seekBackwards in interface AbfsInputStreamStatistics

Parameters:

negativeOffset - how far was the seek? This is expected to be negative.

seekForwards

public void seekForwards(long skipped)

Record a forward seek, adding a seek operation, a forward seek operation, and any bytes skipped.

Specified by:

seekForwards in interface AbfsInputStreamStatistics

Parameters:

skipped - number of bytes skipped by reading from the stream. If the seek was implemented by a close + reopen, set this to zero.

seek

public void seek(long seekTo,
                 long currentPos)

Record a forward or backward seek, adding a seek operation, a forward or a backward seek operation, and number of bytes skipped. The seek direction will be calculated based on the parameters.

Specified by:

seek in interface AbfsInputStreamStatistics

Parameters:

seekTo - seek to the position.

currentPos - current position.

bytesRead

public void bytesRead(long bytes)

Increment the bytes read counter by the number of bytes; no-op if the argument is negative.

Specified by:

bytesRead in interface AbfsInputStreamStatistics

Parameters:

bytes - number of bytes read.

bytesReadFromBuffer

public void bytesReadFromBuffer(long bytes)

Record the total bytes read from buffer. Total bytes read from the buffer.

Specified by:

bytesReadFromBuffer in interface AbfsInputStreamStatistics

Parameters:

bytes - number of bytes that are read from buffer.

seekInBuffer

public void seekInBuffer()

Records the total number of seeks done in the buffer. Increment the number of seeks in the buffer.

Specified by:

seekInBuffer in interface AbfsInputStreamStatistics

readOperationStarted

public void readOperationStarted()

A read(byte[] buf, int off, int len) operation has started.

Specified by:

readOperationStarted in interface AbfsInputStreamStatistics

readAheadBytesRead

public void readAheadBytesRead(long bytes)

Total bytes read from readAhead buffer during a read operation.

Specified by:

readAheadBytesRead in interface AbfsInputStreamStatistics

Parameters:

bytes - the bytes to be incremented.

remoteBytesRead

public void remoteBytesRead(long bytes)

Total bytes read remotely after nothing was read from readAhead buffer.

Specified by:

remoteBytesRead in interface AbfsInputStreamStatistics

Parameters:

bytes - the bytes to be incremented.

remoteReadOperation

public void remoteReadOperation()

Records a successful remote read operation. Increment the counter when a remote read operation occurs.

Specified by:

remoteReadOperation in interface AbfsInputStreamStatistics

getIOStatistics

public org.apache.hadoop.fs.statistics.IOStatistics getIOStatistics()

Getter for IOStatistics instance used.

Specified by:

getIOStatistics in interface AbfsInputStreamStatistics

Specified by:

getIOStatistics in interface org.apache.hadoop.fs.statistics.IOStatisticsSource

Returns:

IOStatisticsStore instance which extends IOStatistics.

getSeekOperations

@VisibleForTesting
public long getSeekOperations()

getForwardSeekOperations

@VisibleForTesting
public long getForwardSeekOperations()

getBackwardSeekOperations

@VisibleForTesting
public long getBackwardSeekOperations()

getBytesRead

@VisibleForTesting
public long getBytesRead()

getBytesSkippedOnSeek

@VisibleForTesting
public long getBytesSkippedOnSeek()

getBytesBackwardsOnSeek

@VisibleForTesting
public long getBytesBackwardsOnSeek()

getSeekInBuffer

@VisibleForTesting
public long getSeekInBuffer()

getReadOperations

@VisibleForTesting
public long getReadOperations()

getBytesReadFromBuffer

@VisibleForTesting
public long getBytesReadFromBuffer()

getRemoteReadOperations

@VisibleForTesting
public long getRemoteReadOperations()

getReadAheadBytesRead

@VisibleForTesting
public long getReadAheadBytesRead()

getRemoteBytesRead

@VisibleForTesting
public long getRemoteBytesRead()

getActionHttpGetRequest

@VisibleForTesting
public double getActionHttpGetRequest()

Getter for the mean value of the time taken to complete a HTTP GET request by AbfsInputStream.

Returns:

mean value.

toString

public java.lang.String toString()

String operator describes all the current statistics. Important: there are no guarantees as to the stability of this value.

Specified by:

toString in interface AbfsInputStreamStatistics

Overrides:

toString in class java.lang.Object

Returns:

the current values of the stream statistics.