RedisManager | cluster Tomcat 6.x and Tomcat | Runtime Evironment library

I'm just starting with Cloud SQL Management API, setup an API Key, and followed instructions as per the docs at https://developers.google.com/api-client-library/dotnet/get_started#finding-information-about-the-apis.

Relevant code:

I've set up a fresh installation of Laravel in Homestead and I've installed PhpRedis as recommended in the Laravel docs https://laravel.com/docs/7.x/redis#phpredis.

I followed this guide for installing PhpRedis https://webstoked.com/install-phpredis-laravel-ubuntu/

In both the Laravel docs, and the guide I've linked for installing PhpRedis, I'm instructed to rename the Redis alias in config/app.php.

If you plan to use PhpRedis extension along with the Redis Facade alias, you should rename it to something else, like RedisManager, to avoid a collision with the Redis class. You can do that in the aliases section of your app.php config file.
- Laravel Docs

To further add to my confusion, the Laravel docs then go on to say that you should remove the alias entirely.

To avoid class naming collisions with the Redis PHP extension itself, you will need to delete or rename the Illuminate\Support\Facades\Redis facade alias from your app configuration file's aliases array. Generally, you should remove this alias entirely and only reference the facade by its fully qualified class name while using the Redis PHP extension.
- Laravel Docs

My main questions are:

1. What does, "If you plan to use PhpRedis extension along with the Redis Facade alias", mean?
2. When should I rename the alias, remove it, or leave it as-is?
3. Depending on if I rename or remove the alias, how will this affect using Redis?

I am trying to create multiple Redis connection in Laravel Command. It just let me create one connection in it and for others, it fails with error

I created two realms for authentication in apache shiro, but when i tried to call hasRole("any") it throws the following exception (if the role exists, it returns true):

I'm trying to understand how pipeline works nad want to try something different. I've noticed that there's no method for setting expire key if the key doesn't have any so I made an example for that with Jedis.

Example

Redis pipeline has 2 options to send commands to database "exec" and "sync". I'd want to know what is the difference between them.

I'll use Jedis ,java api for redis, for the examples.

Examples

Example 1

I have a WebApi in .NET CORE 3.1 in which I'm trying to get results from a service (other third party). I have created multiple requests in my API for the same service but some parameters of every request are different, the results return from service will be different for every request but structure of result will be same.

As all requests are independent of each other I want to run all that in parallel. And I want to return the first result as soon as received from the service from my API, but I also want to run all other requests in background and save there results in REDIS.

I tried to create a sample code to check if possible: