Hanlin Liu created KAFKA-7423:
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Summary: Kafka compact topic data missing.
Key: KAFKA-7423
URL: https://issues.apache.org/jira/browse/KAFKA-7423
Project: Kafka
Issue Type: Bug
Components: core
Affects Versions: 0.10.2.0
Reporter: Hanlin Liu
We are using a single node kafka and schema registry with version 0.10.2.
We are experiencing data lost for _schemas topic which is a compact topic used
by schema registry for storage.
There are only 4 messages in the topic and we can see a lot of (50+) subjects
from schema registry rest service \{schema registry}:8081/subjects.
The topic is configured to compact cleanup policy:
Topic:_schemas PartitionCount:1 ReplicationFactor:1
Configs:cleanup.policy=compact
Topic: _schemas Partition: 0 Leader: 1001 Replicas: 1001 Isr: 1001
The broker retention hours is set to 120 hours and the first message in the
topic was written 3 days ago.
We can see the data from the schema registry rest service, we believe schema
registry didn't delete the data.
So we are suspecting kafka broker retentioned the data for some reason.
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