tragedy | A high-level Cassandra Object Abstraction for Python

as S.O link commented by Paul Samsotha says, i should have used StreamingOutput instead of ServletOutputStream. so the method should be rewritten as so:

Demo - https://mongoplayground.net/p/y3kvFnocWKn

Use aggregation query

Read the below links for better understanding

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$size

In MongoDB replication, the primary node writes events to the oplog that describe the writes as they occur. Secondary nodes copy apply these events and replay them so that the data on the secondary is logically the same as that on the primary.

A delayed secondary node will copy the events from the primary as soon as they are written, and buffer them locally for the delay period.

A delayed secondary node is not eligible to ever become primary.

The cluster as you've described is already fragile, and not highly available. If there is any problem with the existing primary, there is no other node that can accept writes, and no other node eligible to become primary.

That cluster will also take at least an hour to replicate any write, so many writes from the application will appear to take a full hour to complete.

In the scenario in the question the primary has dropped the databases and written the events to the oplog, and the secondary node has likely copied these events already. This means if you just turn off the primary, the secondary node will still happily drop the databases when it applies those events in an hour.

Also note that the secondary node has not applied any of the writes that occurred in the last hour.

If you stop the secondary nodes as soon as you realize the drop has occurred, you can prevent it from applying those operations. Then immediately make a new backup of the secondary to protect the data, reconfigure the secondary as a standalone node, start it up, extract the data and re-insert it to the primary node.

Could be this one:

Here's a way to do this using dplyr:

In order to move the cursor to a specified position, it's necessary to use the underlying QTextDocument using document().
Through findBlockByLineNumber you can construct a QTextCursor and use setTextCursor() to "apply" that cursor (including the actual caret position) to the plain text.

To avoid explicit cloneing, I think it should suffice to derive(Copy) for SomeEnum.

So I have done it in a different way. I have created a column to mask which rows to keep and to delete. I accessed the target row and checked the similarity with the rows below it.

IndexOutOfRangeException is for when you attempt to access an element of an array or collection with an index out of range. For example, accessing the 11th element of an array of size 10.

ArgumentOutOfRangeException does not involve arrays. It is used when a value is out of range. For example, setting someone's birthday to the 13th month.

Which should you extend? Board index out of bounds sounds a bit like someone attempted to locate something with an index that is out of range. It seems like IndexOutOfRangeException is a defensible choice. However, it extends SystemException which may not be appropriate for your Application's exception.

Is there any reason why you don't just extend Exception? It's what Microsoft's documentation seems to suggest: https://docs.microsoft.com/en-us/dotnet/standard/exceptions/how-to-create-user-defined-exceptions

Their best practices document suggests using the built-in exceptions where possible. Is IndexOutOfRangeException unsuitable for you? https://docs.microsoft.com/en-us/dotnet/standard/exceptions/best-practices-for-exceptions