apache/flink · error · RuntimeException

Row length mismatch. %s fields expected but was %s.

Error message

Row length mismatch. %s fields expected but was %s.

What it means

Error "Row length mismatch. %s fields expected but was %s." thrown in apache/flink.

Source

Thrown at flink-formats/flink-csv/src/main/java/org/apache/flink/formats/csv/RowCsvInputFormat.java:316

        };
    }

    private static RuntimeConverter createByteArrayRuntimeConverter(boolean ignoreParseErrors) {
        return (node) -> {
            try {
                return node.binaryValue();
            } catch (IOException e) {
                if (!ignoreParseErrors) {
                    throw new RuntimeException("Unable to deserialize byte array.", e);
                }
                return null;
            }
        };
    }

    static void validateArity(int expected, int actual, boolean ignoreParseErrors) {
        if (expected != actual && !ignoreParseErrors) {
            throw new RuntimeException(
                    "Row length mismatch. "
                            + expected
                            + " fields expected but was "
                            + actual
                            + ".");
        }
    }

    /** Create a builder. */
    public static Builder builder(TypeInformation<Row> typeInfo, Path... filePaths) {
        return new Builder(typeInfo, filePaths);
    }

    /** A builder for creating a {@link RowCsvInputFormat}. */
    public static class Builder implements Serializable {

        private final Path[] filePaths;
        private final TypeInformation[] fieldTypes;

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Row length mismatch. the reported value fields expected but was 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 ("Row length mismatch. the reported value fields expected but was the reported value.") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Row length mismatch. the reported value fields expected but was the reported value.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Row length mismatch. the reported value fields expected but was the reported value.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/bb09b4dc7c03c547. Report an issue: GitHub.