Mamsys Consultancy Services Quality Analyst Interview Questions and Answers

Repartition increases or decreases the number of partitions in a DataFrame, while coalesce only decreases the number of partitions.

• Repartition shuffles the data across the network, while coalesce does not.

• Repartition can be used to increase parallelism, while coalesce is used to reduce it.

• Repartition can result in uneven partition sizes, while coalesce always results in equal or smaller partition sizes.

Generator produces values on the fly while iterator returns values from a collection.

• Generators use 'yield' keyword to produce values one at a time.

• Iterators use 'next()' method to return the next value in a collection.

• Generators can be infinite while iterators are finite.

• Generators are memory efficient while iterators may require more memory.

• Example of generator: function* myGenerator() { yield 1; yield 2; }

• Example of...read more

JMS and queues can be configured by defining connection factories, destinations, and message listeners.

• Define a connection factory for the JMS provider

• Define a destination (queue or topic) for sending and receiving messages

• Configure message listeners to receive and process messages

• Example: In Apache ActiveMQ, create a connection factory and queue using the web console or configuration files

• Example: In Spring Boot, conf...read more

Thread dump can be taken using various tools and commands.

• Using jstack command in Java

• Using kill -3 command in Unix/Linux

• Using VisualVM tool

• Using Eclipse MAT tool

• Thread dump can help in identifying thread deadlock and performance issues