org.cloudera.htrace

Interface Span

All Known Implementing Classes:

MilliSpan

public interface Span

Base interface for gathering and reporting statistics about a block of execution.

Spans form a tree structure with the parent relationship. The first span in a trace has no parent span.

Field Summary

Fields

Modifier and Type	Field and Description
static long	ROOT_SPAN_ID

Method Summary

Methods

Modifier and Type	Method and Description
void	addKVAnnotation(byte[] key, byte[] value) Add a data annotation associated with this span
void	addTimelineAnnotation(String msg) Add a timeline annotation associated with this span
Span	child(String description) Create a child span of this span with the given description
long	getAccumulatedMillis() Return the total amount of time elapsed since start was called, if running, or difference between stop and start
String	getDescription() Return a textual description of this span
Map<byte[],byte[]>	getKVAnnotations() Get data associated with this span (read only)
long	getParentId() Return the pseudo-unique (random) number of the parent span, returns ROOT_SPAN_ID if this is the root span
String	getProcessId() Return a unique id for the node or process from which this Span originated.
long	getSpanId() A pseudo-unique (random) number assigned to this span instance
long	getStartTimeMillis() Get the start time, in milliseconds
long	getStopTimeMillis() Get the stop time, in milliseconds
List<TimelineAnnotation>	getTimelineAnnotations() Get any timeline annotations (read only)
long	getTraceId() A pseudo-unique (random) number assigned to the trace associated with this span
boolean	isRunning() Has the span been started and not yet stopped?
void	stop() The block has completed, stop the clock
String	toString()

Field Detail

ROOT_SPAN_ID

static final long ROOT_SPAN_ID

See Also:

Constant Field Values

Method Detail

stop

void stop()

The block has completed, stop the clock

getStartTimeMillis

long getStartTimeMillis()

Get the start time, in milliseconds

getStopTimeMillis

long getStopTimeMillis()

Get the stop time, in milliseconds

getAccumulatedMillis

long getAccumulatedMillis()

Return the total amount of time elapsed since start was called, if running, or difference between stop and start

isRunning

boolean isRunning()

Has the span been started and not yet stopped?

getDescription

String getDescription()

Return a textual description of this span

getSpanId

long getSpanId()

A pseudo-unique (random) number assigned to this span instance

getTraceId

long getTraceId()

A pseudo-unique (random) number assigned to the trace associated with this span

child

Span child(String description)

Create a child span of this span with the given description

toString

String toString()

Overrides:

toString in class Object

getParentId

long getParentId()

Return the pseudo-unique (random) number of the parent span, returns ROOT_SPAN_ID if this is the root span

addKVAnnotation

void addKVAnnotation(byte[] key,
                   byte[] value)

Add a data annotation associated with this span

addTimelineAnnotation

void addTimelineAnnotation(String msg)

Add a timeline annotation associated with this span

getKVAnnotations

Map<byte[],byte[]> getKVAnnotations()

Get data associated with this span (read only)

getTimelineAnnotations

List<TimelineAnnotation> getTimelineAnnotations()

Get any timeline annotations (read only)

getProcessId

String getProcessId()

Return a unique id for the node or process from which this Span originated. IP address is a reasonable choice.

Returns: