Distributed tracing for Node.js

Mar 24, 20173 likes1,215 views

Distributed tracing is a very useful practice for Node.js because it gives you a good visibility over the way your async code executes and the lifecycle of your external calls as they travels between many services.

Distributed Tracing in Node.js
@stoitsev

Distributed tracing is
very very useful for Node.js

every other service
in the company
services you know

NGINX
NGINX
NGINX
HAProxy
HAProxy
Backend

Dapper, a Large-Scale Distributed Systems
Tracing Infrastructure
https://research.google.com/pubs/pub36356.html

http://opentracing.io/

http://zipkin.io/

Jaeger
https://github.com/uber/jaeger

https://eng.uber.com/distributed-tracing/

Play with distributed tracing
https://github.com/uber/jaeger/tree/master/examples/hotrod

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Unittest and pytest are the most popular testing frameworks in Python. Overall, pytest provides some advantages, including simpler assertion, reuse of fixtures, and interoperability. Due to such benefits, multiple projects in the Python ecosystem have migrated from unittest to pytest. To facilitate the migration, pytest can also run unittest tests, thus, the migration can happen gradually over time. However, the migration can be timeconsuming and take a long time to conclude. In this context, projects would benefit from automated solutions to support the migration process. In this paper, we propose TestMigrationsInPy, a dataset of test migrations from unittest to pytest. TestMigrationsInPy contains 923 real-world migrations performed by developers. Future research proposing novel solutions to migrate frameworks in Python can rely on TestMigrationsInPy as a ground truth. Moreover, as TestMigrationsInPy includes information about the migration type (e.g., changes in assertions or fixtures), our dataset enables novel solutions to be verified effectively, for instance, from simpler assertion migrations to more complex fixture migrations. TestMigrationsInPy is publicly available at: https://github.com/altinoalvesjunior/TestMigrationsInPy.

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