Which of the following is not true about the In-Sync Replica list?

The correct answer is C. Once a broker is removed from the ISR list for a partition, it cannot be added again. C is not true about the In-Sync Replica (ISR) list. A broker removed from the ISR list (due to lagging behind the leader beyond replica.lag.time.max.ms) can be added back once it catches up with the leader's log end offset. The ISR list is dynamic--replicas shrink and expand as…

Ensuring Data Reliability and Durability

Question

Options

AThe leader broker for a partition is always in the ISR list
BThe ISR list contains all replicas that are identical at least up to the high-water mark
COnce a broker is removed from the ISR list for a partition, it cannot be added again
DWhen the leader broker fails, a new leader will be selected from a follower in the ISR list (unless

How the community answered

(43 responses)

A
12% (5)
B
9% (4)
C
74% (32)
D
5% (2)

Explanation

C is not true about the In-Sync Replica (ISR) list. A broker removed from the ISR list (due to lagging behind the leader beyond replica.lag.time.max.ms) can be added back once it catches up with the leader's log end offset. The ISR list is dynamic--replicas shrink and expand as followers sync or fall behind.

Topics

#ISR#in-sync replicas#replication#leader election

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