How often is log compaction evaluated?

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How often is log compaction evaluated?
A . Every time a new partition is created
B . Every time a segment is closed
C . Every time a message is sent to Kafka
D . Every time a message is flushed to disk

Answer: B

Explanation:

Log compaction is evaluated every time a segment is closed. It will be triggered if enough data is "dirty" (see dirty ratio config)