Kevin Wu created KAFKA-17803:
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Summary: Reconcile Differences in MockLog and KafkaMetadataLog
`read` Implementation
Key: KAFKA-17803
URL: https://issues.apache.org/jira/browse/KAFKA-17803
Project: Kafka
Issue Type: Improvement
Reporter: Kevin Wu
Calling MockLog or KafkaMetadataLog's read method for a given startOffset
returns a LogOffsetMetadata object that contains an offset field. In the case
of MockLog, this offset field is the base offset of the record batch which
contains startOffset.
However, in KafkaMetadataLog, this offset field is set to the given
startOffset. If the given startOffset is in the middle of a batch, the returned
LogOffsetMetadata will have an offset that does not match the file position of
the returned batch. This makes the javadoc for LogSegment#read inaccurate in
this case since startOffset is not a lower bound (the base offset of the batch
containing startOffset is the lower bound).
The discussed approach was to change MockLog to behave the same way as
KafkaMetadataLog, since this would be safer than changing the semantics of the
read call in UnifiedLog.
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