Tracer (Apache Hadoop Common 3.3.4 API)

```
public class Tracer
extends Object
```
No-Op Tracer (for now) to remove HTrace without changing too many files.

Nested Classes
Modifier and Type	Class and Description
`static class`	`Tracer.Builder`

Fields
Modifier and Type	Field and Description
`static String`	`SPAN_RECEIVER_CLASSES_KEY`

Constructors
Constructor and Description
`Tracer(String name)`

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`TraceScope`	`activateSpan(Span span)`
`void`	`close()`
`static Tracer`	`curThreadTracer()`
`static Span`	`getCurrentSpan()` Return active span.
`String`	`getName()`
`TraceScope`	`newScope(String description)`
`TraceScope`	`newScope(String description, SpanContext spanCtx)`
`TraceScope`	`newScope(String description, SpanContext spanCtx, boolean finishSpanOnClose)`
`Span`	`newSpan(String description, SpanContext spanCtx)`

public static Tracer curThreadTracer()

public TraceScope newScope(String description)

public Span newSpan(String description,
                    SpanContext spanCtx)

public TraceScope newScope(String description,
                           SpanContext spanCtx)

public TraceScope newScope(String description,
                           SpanContext spanCtx,
                           boolean finishSpanOnClose)

public TraceScope activateSpan(Span span)

Class Tracer