Added initial tracing support.

[yuce]

Fixes #141

[coveralls]

Coverage increased (+0.03%) to 98.513% when pulling 51017cb on yuce:tracing-support into 5ec3152 on pilosa:master.

[coveralls]

Coverage increased (+0.02%) to 98.502% when pulling fd15a49 on yuce:tracing-support into 5ec3152 on pilosa:master.

[alanbernstein]

I'm trying to run the example script, but I'm getting an odd error:

$ python tracing-test.py
Traceback (most recent call last):
  File "tracing-test.py", line 42, in <module>
    main()
  File "tracing-test.py", line 29, in main
    schema = client.schema()
  File "/Users/abernstein/src/pilosa/python-pilosa/pilosa/client.py", line 280, in schema
    with self.tracer.scope_manager.activate(span, True) as scope:
AttributeError: 'Tracer' object has no attribute 'scope_manager'

Some version info:

$ pip install jaeger-client
Requirement already satisfied: jaeger-client in /usr/local/lib/python3.7/site-packages (3.13.0)
Requirement already satisfied: thrift in /usr/local/lib/python3.7/site-packages (from jaeger-client) (0.11.0)
Requirement already satisfied: tornado<5,>=4.3 in /usr/local/lib/python3.7/site-packages (from jaeger-client) (4.5.3)
Requirement already satisfied: opentracing<2,>=1.2.2 in /usr/local/lib/python3.7/site-packages (from jaeger-client) (1.3.0)
Requirement already satisfied: threadloop<2,>=1 in /usr/local/lib/python3.7/site-packages (from jaeger-client) (1.0.2)
Requirement already satisfied: six>=1.7.2 in /usr/local/lib/python3.7/site-packages (from thrift->jaeger-client) (1.11.0)

I wonder if there is a better way for me to use this branch of the pilosa client while using the test script?

[yuce]

It seems jaeger client is not compatible with OpenTracing 2, I've downgraded it to 1.3.0

[alanbernstein]

With this change, the script finishes, but in the Jaeger UI, I only see jaeger-query in the service dropdown

[alanbernstein]

The updated docker command fixed my problem

[yuce]

Great!