apache/flink · error · IOException

Failed to deserialize CSV row.

Error message

Failed to deserialize CSV row.

What it means

Error "Failed to deserialize CSV row." thrown in apache/flink.

Source

Thrown at flink-formats/flink-csv/src/main/java/org/apache/flink/formats/csv/RowCsvInputFormat.java:146

    }

    @Override
    public boolean reachedEnd() {
        return end;
    }

    @Override
    public Row nextRecord(Row record) throws IOException {
        Row returnRecord = null;
        do {
            try {
                JsonNode root = iterator.nextValue();
                returnRecord = (Row) runtimeConverter.convert(root);
            } catch (NoSuchElementException e) {
                end = true;
            } catch (Throwable t) {
                if (!ignoreParseErrors) {
                    throw new IOException("Failed to deserialize CSV row.", t);
                }
            }
        } while (returnRecord == null && !reachedEnd());

        return returnRecord;
    }

    // --------------------------------------------------------------------------------------------

    interface RuntimeConverter extends Serializable {
        Object convert(JsonNode node);
    }

    private static RuntimeConverter createRowRuntimeConverter(
            RowTypeInfo rowTypeInfo, boolean ignoreParseErrors, boolean isTopLevel) {
        final TypeInformation<?>[] fieldTypes = rowTypeInfo.getFieldTypes();
        final String[] fieldNames = rowTypeInfo.getFieldNames();

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Failed to deserialize CSV row.
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("Failed to deserialize CSV row.") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Failed to deserialize CSV row.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Failed to deserialize CSV row.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/3250d21ad133dd5c. Report an issue: GitHub.