pool | Simple worker pool example ‍️ | Key Value Database library

If this isn't going to throw an exception then I don't know what is going to.

This is caused by using blocking code within Netty's event loop.

The code over here is making a blocking request 20 times in a row which cause the machine to break. I don't know what data is coming from the client but I would never recommend to do it in this manner.

Actually, there is nothing wrong with the YAML. The problem was a delay in the virtual machine loading the VHDX. In other words, wait about 5 minutes once the VHDX is mounted before trying to run the application. I am leaving this here in case anyone else runs into this issue.

Pythons multiprocessing package is limited to shared memory parallelization. It spawns new processes that all have access to the main memory of a single machine.

You cannot simply scale out such a software onto multiple nodes. As the different machines do not have a shared memory that they can access.

To run your program on multiple nodes at once, you should have a look into MPI (Message Passing Interface). There is also a python package for that.

Depending on your task, it may also be suitable to run the program 4 times (so one job per node) and have it work on a subset of the data. It is often the simpler approach, but not always possible.

I would recommend using /action:Script (see here) to see which actions it will perform, most likely this will give you some clue as to which flags should be set/cleared.

-- Edit According to this old answer you can disable deploying the database properties when designing the .dacpac.
If you want to override this behaviour when publishing the .dacpac, you should probably use the ScriptDatabaseOptions property - see the whole list of switches here.

The solution lies in the federated identity pool's settings.

By default the identity pool will provide the IAM role that it's configured with. In other words, one of either the "unauthenticated role" or the "authenticated role" that it's set up with.

But it can be told instead to provide a role specified by the authentication provider. That's what will solve the problem here.

1. In the AWS console, in Cognito, open the relevant identity pool.
2. Click "Edit identity pool" (top right)
3. Expand "Authentication Providers"
4. Under Authenticated Role Selection, choose "Choose role from token".

That will allow Cognito to specify its own roles, and you will find that the users get the privileges of their group.

I would start with running sp_who2 on the database server to see if sqlpackage has made a connection to it, and if it's blocking on the server somewhere.

If so, you can further investigate with the SQL Server Profiler (can be found in the Tools menu of SQL Server Management Studio)

The QueuePool constructor passes all keyword arguments to the Pool constructor. This constructor supports the dialect argument. So you should be able to add a dialect to your QueuePool call:

According to the QueuePool docs the first argument should be 'a callable function that returns a DB-API connection object'.

You've passed the result of the called function to the QueuePool object as the first argument instead of the function itself. Remove the parenthesis to solve the issue: