[FLINK-26643] EOFException throws when use TypeInformationKeyValueSerializationSchema to deserialize data from kafka

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.13.2, 1.14.3
• Component/s: API / Core

Language

Java

• Assignee: Unassigned
• Reporter: Hengtai Nie
• Created: 15/Mar/22 06:13
• Updated: 15/Mar/22 06:18

Description

Recently , I use TypeInformationKeyValueSerializationSchema  to deserialize data from kafka, it throws java.io.EOFException .

 

Useage in code: 

setDeserializer(KafkaRecordDeserializationSchema.of(new TypeInformationKeyValueSerializationSchema (String.class, String.class, new ExecutionConfig())));

 

Data in Kafka is like:

key(string):2 22 6F F0 A8 8B 69 E 61 22 A5 E7 B5 50

value(json string):

{ "timestamp":"2022-3-11 17:9", "deviceNumber":"22 6F F0 A8 8B 69 E 61 22 A5 E7 B5 50 ", "eventId":"830500" }

 

After  trouble shooting, I think follwing API is the root cause:

org.apache.flink.core.memory.DataInputDeserializer.readUnsignedByte()

public int readUnsignedByte () throws IOException {
    if (this.position < this.end) {
        return (this.buffer[this.position++] & 0xff);
    } else {
        throw new EOFException();
    }
}

 

Obviously, it is wrong to throw an exception when (this.positon == this.end). 

It just means finishing to read unsigned byte when  (this.positon == this.end), nothing need to do.