org.apache.flink.runtime.webmonitor

Class OperatorBackPressureStats

java.lang.Object

org.apache.flink.runtime.webmonitor.OperatorBackPressureStats

public class OperatorBackPressureStats
extends Object

Back pressure statistics of multiple tasks.

Statistics are gathered by sampling stack traces of running tasks. The back pressure ratio denotes the ratio of traces indicating back pressure to the total number of sampled traces.

Constructor Summary

Constructors

Constructor and Description
OperatorBackPressureStats(int sampleId, long endTimestamp, double[] subTaskBackPressureRatio)

Method Summary

Methods

Modifier and Type	Method and Description
double	getBackPressureRatio(int index) Returns the ratio of stack traces indicating back pressure to total number of sampled stack traces.
long	getEndTimestamp() Returns the time stamp, when all stack traces were collected at the JobManager.
double	getMaxBackPressureRatio() Returns the maximum back pressure ratio of all sub tasks.
int	getNumberOfSubTasks() Returns the number of sub tasks.
int	getSampleId() Returns the ID of the sample.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

OperatorBackPressureStats

public OperatorBackPressureStats(int sampleId,
                         long endTimestamp,
                         double[] subTaskBackPressureRatio)

Method Detail

getSampleId

public int getSampleId()

Returns the ID of the sample.

Returns:

ID of the sample

getEndTimestamp

public long getEndTimestamp()

Returns the time stamp, when all stack traces were collected at the JobManager.

Returns:

Time stamp, when all stack traces were collected at the JobManager

getNumberOfSubTasks

public int getNumberOfSubTasks()

Returns the number of sub tasks.

Returns:

Number of sub tasks.

getBackPressureRatio

public double getBackPressureRatio(int index)

Returns the ratio of stack traces indicating back pressure to total number of sampled stack traces.

Parameters:

index - Subtask index.

Returns:

Ratio of stack traces indicating back pressure to total number of sampled stack traces.

getMaxBackPressureRatio

public double getMaxBackPressureRatio()

Returns the maximum back pressure ratio of all sub tasks.

Returns:

Maximum back pressure ratio of all sub tasks.

toString

public String toString()

Overrides:

toString in class Object