Hi wave We are using Flink CDC MySQL 3 6 and facing serializ Apache Flink #flink-cdc

Hi :wave: We are using Flink CDC MySQL 3.6 and fac...

Irene Rodriguez

08/24/2026, 2:47 PM

Hi 👋 We are using Flink CDC MySQL 3.6 and facing serialization issues caused by:

io.debezium.DebeziumException: Failed to deserialize data of EventHeaderV4

. We have several MySQL consumers working perfectly with Flink CDC, but one specific consumer refuses to work. We've tried various troubleshooting steps, including the official Flink recommended configurations for this issue, but haven't had any success. Has anyone run into this or found a fix?

Leonard Xu

08/25/2026, 12:49 PM

hi, could you offer a more specific stacktrace?

Irene Rodriguez

08/25/2026, 1:04 PM

yes, of course:

Irene Rodriguez

08/25/2026, 1:05 PM

the main error is this:

Irene Rodriguez

08/25/2026, 1:05 PM

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caused by java.io.EOFException: Failed to read remaining 2 of 59 bytes from position 800358194. Block length: 4381. Initial block length: 8031.

           com.github.shyiko.mysql.binlog.io.ByteArrayInputStream.fill(ByteArrayInputStream.java:115)
             com.github.shyiko.mysql.binlog.io.ByteArrayInputStream.read(ByteArrayInputStream.java:105)
            io.debezium.connector.mysql.RowDeserializers.deserializeVarString(RowDeserializers.java:264)
…connector.mysql.RowDeserializers$UpdateRowsDeserializer.deserializeVarString(RowDeserializers.java:

Irene Rodriguez

08/25/2026, 1:07 PM

we already checked all the columns, and the order is correct , the data type....

Irene Rodriguez

08/25/2026, 3:13 PM

the only thing weird that we saw if we compare with other tables/database is that this was using utf3, but we changed it and the error continue going on.

Irene Rodriguez

08/26/2026, 10:32 AM

this is the error: stackoverflow.com/questions/68482482/error-while-trying-to-run-connector-class-io-debezium-connector-mysql-mysqlconn

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