Distributed tracing (Jaeger, Zipkin) in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a new trace span in a microservice.

Microservices

tracer = init_tracer('my-service')
with tracer.start_span('[1]') as span:
    process_request()

Drag options to blanks, or click blank then click option'

Atrace_span

Btrace_id

Cspan_context

Dhandle_request

Attempts:

3 left

💡 Hint

Common Mistakes

Using internal IDs like 'trace_id' instead of a descriptive span name.

Confusing span context with span name.

The span name should describe the operation, such as 'handle_request'.

2fill in blank

medium

Complete the code to propagate trace context via HTTP headers.

Microservices

headers = {}
tracer.inject(span.context, format=[1], carrier=headers)
send_request(headers)

Drag options to blanks, or click blank then click option'

AFormat.HTTP_HEADERS

BFormat.TEXT_MAP

CFormat.JSON

DFormat.BINARY

Attempts:

3 left

💡 Hint

Common Mistakes

Using binary or JSON formats which are not suitable for HTTP headers.

Using TEXT_MAP which is generic but not specific for HTTP headers.

HTTP headers format is used to propagate trace context over HTTP.

3fill in blank

hard

Fix the error in the code to correctly extract trace context from incoming HTTP headers.

Microservices

span_ctx = tracer.extract(format=[1], carrier=request.headers)
with tracer.start_span('handle', child_of=span_ctx) as span:
    process()

Drag options to blanks, or click blank then click option'

AFormat.TEXT_MAP

BFormat.HTTP_HEADERS

CFormat.BINARY

DFormat.JSON

Attempts:

3 left

💡 Hint

Common Mistakes

Using TEXT_MAP or BINARY formats which cause extraction errors.

Not matching the injection format.

Extracting trace context from HTTP headers requires the TEXT_MAP format.

4fill in blank

hard

Fill both blanks to create a trace span with tags for service name and error status.

Microservices

with tracer.start_span('db_query') as span:
    span.set_tag('[1]', 'user-service')
    span.set_tag('[2]', True)

Drag options to blanks, or click blank then click option'

Aservice.name

Berror

Chttp.status_code

Dspan.kind

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'http.status_code' instead of 'error' for error tagging.

Confusing 'span.kind' with service name.

Use 'service.name' to tag the service and 'error' to indicate an error occurred.

5fill in blank

hard

Fill all three blanks to create a dictionary of spans with their durations filtered by duration > 100ms.

Microservices

slow_spans = {span.[1]: span.[2] for span in spans if span.[3] > 100}

Drag options to blanks, or click blank then click option'

Aoperation_name

Bduration_ms

Dstart_time

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start_time' instead of 'duration_ms' for filtering.

Mixing up keys and values in the dictionary comprehension.

Use 'operation_name' as key, 'duration_ms' as value, and filter by 'duration_ms' > 100.