[FLINK-18705] Debezium-JSON throws NPE when tombstone message is received

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.11.0, 1.11.1
• Fix Version/s: 1.11.2, 1.12.0
• Component/s: Formats (JSON, Avro, Parquet, ORC, SequenceFile), Table SQL / Ecosystem
• Assignee: Jark Wu
• Reporter: Jark Wu
• Created: 24/Jul/20 11:30
• Updated: 31/Jul/20 11:49
• Resolved: 31/Jul/20 11:49

Description

By default, Debezium will send two messages to Kafka for DELETE operation, one for delete message, the other for tombstone message (message value is null). However, debezium-json will throw NPE when processing such tombstone message. We should just skip such messages.

As a workaround, we can diable tombstone on Debezium Connect tombstones.on.delete: false.