apache/flink · error · RuntimeException

Error in data type serialization: %s

Error message

Error in data type serialization: %s

What it means

Error "Error in data type serialization: %s" thrown in apache/flink.

Source

Thrown at flink-core/src/main/java/org/apache/flink/types/Record.java:1023

                            if (serializer.position >= serializer.memory.length - length - 1) {
                                serializer.resize(length);
                            }
                            serializer.position += length;

                        } else {
                            // serialize modified fields
                            this.writeFields[i].write(serializer);
                        }
                    } else {
                        // bin-copy unmodified fields
                        serializer.write(this.binaryData, co, this.lengths[i]);
                    }

                    this.lengths[i] = serializer.position - offset;
                    offset = serializer.position;
                }
            } catch (Exception e) {
                throw new RuntimeException(
                        "Error in data type serialization: " + e.getMessage(), e);
            }
        }

        serializeHeader(serializer, offsets, numFields);

        // set the fields
        this.switchBuffer = this.binaryData;
        this.binaryData = serializer.memory;
        this.binaryLen = serializer.position;
        this.firstModifiedPos = Integer.MAX_VALUE;
    }

    private void serializeHeader(
            final InternalDeSerializer serializer, final int[] offsets, final int numFields) {
        try {
            if (numFields > 0) {
                int slp = serializer.position; // track the last position of the serializer

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Error in data type serialization: the reported value
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("Error in data type serialization: the reported value") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Error in data type serialization: the reported value.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Error in data type serialization: the reported value.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/490dcdcfad6d890e. Report an issue: GitHub.