Question

Point out the correct statement.

(a) Drill is a build system based on Apache Ant and Apache Ivy

(b) DirectMemory’s main purpose is to act as a second-level cache

(c) Easyant is inspired by Google’s Dremel

(d) None of the mentioned

This question was posed to me during an interview for a job.

I'm obligated to ask this question of Hadoop Libraries in chapter Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop

Answer 1

The correct option is (b) DirectMemory’s main purpose is to act as a second-level cache

Easiest explanation: DirectMemory is used to store large amounts of data without filling up the Java heap and thus avoiding long garbage collection cycles.