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How to Create a Symmetric Array in Python

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 Here's a Python program that says to write a Symmetric array transformation. A top interview question. Symmetric Array Transformation Problem: Write a Python function that transforms a given array into a symmetric array by mirroring it around its center. For example: Input: [1, 2, 3] Output: [1, 2, 3, 2, 1] Hints: Use slicing for the reverse part. Concatenate the original array with its mirrored part. Example def symmetric_array(arr):     """     Transforms the input array into a symmetric array by mirroring it around its center.     Parameters:     arr (list): The input array.     Returns:     list: The symmetric array.     """     # Mirror the array by concatenating the original with its reverse (excluding the last element to avoid duplication)     return arr + arr[-2::-1] # Example usage input_array = [1, 2, 3] symmetric_result = symmetric_array(input_array) print("Input Array:", input_arr...
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2 Exclusive Ways to Start Kafka Services

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The Kafka services start or stop you can do in two ways. Those are Systemd and Systemctl (sudo user). Below, you will find the commands for these two methods.


2 Ways to start Kafka Services


How to start/stop Kafka service

Here are exclusive ways. With these, you can start or stop Kafka services.  

1. Systemd service

The concept of unit files people who worked on Linux servers have familiarity with it. Also, they know creating the unit file to use by systemd.

To summarize, it initializes and maintains components throughout the system. This means that you can define ZooKeeper and Kafka as unit files, which then will be used by systems.


Commands

The first command starts the service, and the second command stops the service.

... [Service] ...

ExecStart=/opt/kafkainaction/bin/zookeeper-server-start.sh
ExecStop= /opt/kafkainaction/bin/zookeeper-server-stop.sh


2. Systemctl by Sudo (root) user

The root user can start or stop the Kafka services. This is more like front-end processing. This way of executing is called systemctl.

Commands

The first command starts the Zookeeper and the second one starts Kafka.

$sudo systemctl start zookeeper
$sudo systemctl start kafka

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