Stanislav Spiridonov created KAFKA-16382:
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Summary: Kafka Streams drop NULL values after reset
Key: KAFKA-16382
URL: https://issues.apache.org/jira/browse/KAFKA-16382
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 3.6.1
Reporter: Stanislav Spiridonov
Kafka Streams (KTable) drops null values after full reset.
See
[https://github.com/foal/Null-Issue/blob/main/src/main/java/NullProblemExample.java]
for sample topology
Step to reproduce (req NULL-IN, NULL-IN-AUX, NULL-OUT topics)
# Start example - 1st round
# Send to NULL-IN "A1:a" -> NULL-OUT "A1:anull"
# Send to NULL-IN-AUX "A1:b" -> NULL-OUT "A1:anull, A1:ab"
# Stop application
# Run kafka-streams-application-reset
{code:java}
call bin/windows/kafka-streams-application-reset --application-id
nullproblem-example^
--input-topics "NULL-IN,NULL-IN-AUX"^
--bootstrap-server "localhost:9092"
{code}
# Send to NULL-IN-AUX "A1:" -> NULL-OUT "A1:anull, A1:ab" - it is Ok (no app
running yet)
# Start example - 2nd round
# After initialization -> NULL-OUT *still contains* "A1:anull, A1:ab"
# Expected output "A1:anull, A1:ab, A1:"
The issue is NOT reproduced if application just restarted (skip step 5).
The issue is NOT reproduced if internal cache is disabled.
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