apache/flink · error · ParquetDecodingException

not a valid mode

Error message

not a valid mode 

What it means

Error "not a valid mode " thrown in apache/flink.

Source

Thrown at flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/vector/reader/RunLengthDecoder.java:283

                    while (valueIndex < this.currentCount) {
                        // values are bit packed 8 at a time, so reading bitWidth will always work
                        ByteBuffer buffer = in.slice(bitWidth);
                        if (buffer.hasArray()) {
                            // byte array has better performance than ByteBuffer
                            this.packer.unpack8Values(
                                    buffer.array(),
                                    buffer.arrayOffset() + buffer.position(),
                                    this.currentBuffer,
                                    valueIndex);
                        } else {
                            this.packer.unpack8Values(
                                    buffer, buffer.position(), this.currentBuffer, valueIndex);
                        }
                        valueIndex += 8;
                    }
                    return;
                default:
                    throw new ParquetDecodingException("not a valid mode " + this.mode);
            }
        } catch (IOException e) {
            throw new ParquetDecodingException("Failed to read from input stream", e);
        }
    }

    enum MODE {
        RLE,
        PACKED
    }
}

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: not a valid mode
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("not a valid mode") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: not a valid mode.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: not a valid mode.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/3ae9963b19473a70. Report an issue: GitHub.