When the load factor (ratio of entries to capacity) exceeds the threshold, the HashMap is rehashed with approximately double the capacity to maintain performance.

The Saga pattern is used in microservices to manage distributed transactions by breaking them into local transactions coordinated through event-driven communication.

Docker containerization ensures that applications run consistently across different environments by packaging the application with all its dependencies.

Composite indexes on join columns and WHERE clause conditions significantly improve query performance by reducing the number of rows scanned.

Elasticity in cloud computing refers to the automatic scaling of resources to meet changing demand, ensuring optimal resource utilization and cost efficiency.

In Kafka, the maximum number of active consumers in a group equals the number of partitions. With 8 partitions and 5 consumers, only 3 will remain idle.

The Richardson Maturity Model progresses from the Swamp (0), to Resources (1), HTTP Verbs (2), and finally Hypermedia (3) as the highest level of REST maturity.

Jenkins is the leading open-source automation server widely used by Infosys for implementing CI/CD pipelines to automate testing and deployment processes.

Apache Spark is superior for large-scale batch processing due to its in-memory computing capabilities, providing faster execution than MapReduce for processing large datasets.

ReentrantReadWriteLock provides separate read and write locks, allowing multiple readers but only one writer, offering finer-grained control than basic synchronized constructs.