In a ZooKeeper multi-node configuration, with tickTime=2000 and initLimit=5, what is the time in milliseconds required to initialize a follower with the current leader?

In a ZooKeeper multi-node configuration, with tickTime=2000 and initLimit=5, what is the time in milliseconds required to initialize a follower with the current leader?

• A. 4000
• B. 15000
• C. 10000
• D. 1000

Answer: (C)

Initialization time for a follower is determined by the number of ticks allowed for startup multiplied by the duration of a single tick. The follower has initLimit ticks to initialize after connecting to the leader, and each tick lasts tickTime milliseconds. So the maximum initialization time is initLimit × tickTime. With tickTime = 2000 ms and initLimit = 5, that becomes 5 × 2000 = 10000 ms. This is the window in which the follower must complete its initial synchronization with the leader. The other options don’t align with an integer number of ticks times the tickTime, so they don’t fit the defined window.

Initialization time for a follower is determined by the number of ticks allowed for startup multiplied by the duration of a single tick. The follower has initLimit ticks to initialize after connecting to the leader, and each tick lasts tickTime milliseconds. So the maximum initialization time is initLimit × tickTime. With tickTime = 2000 ms and initLimit = 5, that becomes 5 × 2000 = 10000 ms. This is the window in which the follower must complete its initial synchronization with the leader. The other options don’t align with an integer number of ticks times the tickTime, so they don’t fit the defined window.