Developer Notes on Redis

Debugging 

Debugging is detecting potential errors (called a 'bug') in our source code, which could lead to unusual work for the application or give unexpected results and correct the bugs with the right code. 

In Redis, debugging can be done by setting environment variables DEBUG by adding export DEBUG = 1 before compiling to include the debugging information.

Testing

Redis work in python, so to perform testing in Redis, you will need python. So the first step is to install python. You can install python by using the command line code -

apt-get install python

After installing python, you are also going to need redis-py. So the next step is to install redis. You can install pip first and then use the pip command to install redis-py.

pip install redis

Now the tests you perform need some instance data. So, to run tests, you can use the "embedded" disposable Redis instance, or you can provide your instance. The "embedded" mode requires having the redis-server executable in your PATH. 

Finally, to run the tests on either an "embedded" disposable Redis instance or your instance, you need to run the following code in your project's directory.

$ testing the module using disposable Redis instance
$ make test

You can also override the spawning of the embedded server by specifying a Redis port. To do so, you can use the environment variable REDIS_PORT. 

Following is an example of how you can do so:

$ # testing the module using an existing local Redis instance
$ REDIS_PORT=3697 make test

FAQs

What is Redis?

Redis is used by millions of programmers. It is an open-source, in-memory data store used as a database, streaming engine, message broker, and cache.

What does the RENAME key generate in Redis?

It generates two events. The events are the rename_from event for the source key and the rename_to event for the destination key.

What is Keyspace in Redis?

The internal dictionary that Redis maintains, where all keys are kept, is called keyspace. The keys created does not have a time limit, it lives forever unless removed explicitly. 

What is Debugging?

Debugging is detecting potential errors (called a 'bug') in our source code, which could lead to unusual work for the application or give unexpected results and correct the bugs with the right code.

Why do we need keyspace notifications in Redis?

The keyspace notifications in Redis are used to track the real-time changes to Redis keys and values. These are the alerts to let us know what is happening with the keys and their values in Redis. 

Conclusion

In this article, we discussed some important Developer notes on Redis. We discussed how to debug and test on Redis. To learn about the different Redis tools, go to Tools That Use Redis. Hope you would have gained a better understanding of these topics now!

Are you planning to ace the interviews of reputed product-based companies like Amazon, Google, Microsoft, and more? 

Attempt our Online Mock Test Series on Coding Ninjas Studio now!

Happy Coding!