OffsetsForTimes returns null when it shouldn't

["Gong, Yifei" <Yi...@mlp.com>]

Hi team,

I found that when I seek to a recent timestamp using OffsetsForTimes method:
https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java#L2078
It returns me offsets for all partitions.
However, if I seek an earlier timestamp, it only returns me offsets for some of the partitions and nulls for the rest.
As per the documentation, null means "no such message found", but if I can get a message with a more recent timestamp, it means the message is indeed there right?
I've raised this in stack overflow here with an example:
https://stackoverflow.com/questions/65288469/spring-kafka-offsetsfortimes-method-returns-null-for-some-partitions
I am not sure what could be the cause of this? Can someone help?

Thanks,
Yifei


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