Dana Powers created KAFKA-5465:
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Summary: FetchResponse v0 does not return any messages when
max_bytes smaller than v2 message set
Key: KAFKA-5465
URL: https://issues.apache.org/jira/browse/KAFKA-5465
Project: Kafka
Issue Type: Bug
Affects Versions: 0.11.0.0
Reporter: Dana Powers
Priority: Minor
In prior releases, when consuming uncompressed messages FetchResponse v0 will
returns a message if it is smaller than the max_bytes sent in the FetchRequest.
In 0.11.0.0 RC0, when messages are stored as v2 internally, the response will
be empty unless the full message set is smaller than max_bytes. In some
configurations, this may cause some old consumers to get stuck on large
messages where previously they were able to make progress one message at a time.
For example, when I produce 10 5KB messages using ProduceRequest v0 and then
attempt FetchRequest v0 with partition max bytes = 6KB (larger than a single
message but smaller than all 10 messages together), I get an empty message set
from 0.11.0.0. Previous brokers would have returned a single message.
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