Your topic is log compacted and you are sending a message with the key K and value null. What will happen?

The correct answer is A. The broker will delete all messages with the key K upon cleanup. Sending a message with the null value is called a tombstone in Kafka and will ensure the log compacted topic does not contain any messages with the key K upon compaction.

Application Design

Question

Options

AThe broker will delete all messages with the key K upon cleanup
BThe producer will throw a Runtime exception
CThe broker will delete the message with the key K and null value only upon cleanup
DThe message will get ignored by the Kafka broker

How the community answered

(54 responses)

A
94% (51)
C
2% (1)
D
4% (2)

Explanation

Sending a message with the null value is called a tombstone in Kafka and will ensure the log compacted topic does not contain any messages with the key K upon compaction.

Topics

#log compaction#tombstone#null value#key deletion

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