Question

Point out the correct statement.

(a) All znodes are ephemeral, which means they are describing a “temporary” state

(b) /hbase/replication/state contains the list of RegionServers in the main cluster

(c) Offline snapshots are coordinated by the Master using ZooKeeper to communicate with the RegionServers using a two-phase-commit-like transaction

(d) None of the mentioned

This question was addressed to me in a job interview.

My doubt stems from The ZooKeeper Service topic in chapter ZooKeeper, Sqoop and Cassandra of Hadoop

Answer 1

The correct answer is (a) All znodes are ephemeral, which means they are describing a “temporary” state

The explanation: Although the Replication znodes do not describe a temporary state, they are meant to be the source of truth for the replication state, describing the replication state of each machine.