Understanding Locking and Conditional Writes in AWS DynamoDB
Optimistic locking is a strategy to ensure that the client-side item that you are updating (or deleting) is the same as the item in DynamoDB. …
Read Article →Technical Articles
In-depth guides, insights, and best practices for modern software engineering
AWS CodeDeploy Deployment Type Options
CodeDeploy provides two (2) deployment type options:
Option 1 – In-place Deployment
In-place deployment: The application on each instance in the …
Read Article →Defining Amazon ECS Task Placement Strategies
Amazon ECS supports the following task placement strategies:
binpack – Place tasks based on the least available amount of CPU or memory. This …
Read Article →Deployment methods in AWS Elastic Beanstalk
– All at once – Deploy the new version to all instances simultaneously. All instances in your environment are out of service for a short time while …
Read Article →How to update NTP to sync clock on Linux
If you need to sync the clock on Linux using the central NTP clock service, you can do the following:
sudo service ntp stop
sudo ntpd -gq
sudo service …Data Partitioning Strategies for Distributed Systems
Master data partitioning techniques including sharding.
Understanding Data Partitioning
Data partitioning (also known as sharding) is the process of …
Read Article →Distributed Consensus Algorithms: Building Fault-Tolerant Systems
Master the algorithms that enable distributed systems to agree on shared state despite failures and network partitions.
The Consensus Problem
Before …
Read Article →How to Find IP Address Ranges used by Amazon S3
You can query the ip-ranges Amazon AWS URL, and parse the results through jq as follows:
Generic S3 IP Ranges
Query:
curl -s …How to Find the nth Reverse Number in Java
The challenge
Reverse Number is a number which is the same when reversed.
For example, the first 20 Reverse Numbers are:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, …How to Find the Sum of Intervals in Java
The challenge
Write a function called sumIntervals/sum_intervals() that accepts an array of intervals, and returns the sum of all the interval …
How to Find the Stray Number in Python
The challenge
You are given an odd-length array of integers, in which all of them are the same, except for one single number.
Complete the method …
Read Article →How to Find the EDID UUID of External Mac Monitors
You can issue the following command on an Apple Mac’s terminal to show the EDID UUID (unique serial number) of all attached external monitors: …