prestodb/presto · error · OrcCorruptionException

Unexpected metadata

Error message

Unexpected metadata

What it means

Write-validation error in OrcWriteValidation.validateMetadata: when re-reading a file written under validation, the user metadata stored in the file differs from what the writer recorded. This is a corruption/bug detector — the file on disk does not match what the writer produced.

Source

Thrown at presto-orc/src/main/java/com/facebook/presto/orc/OrcWriteValidation.java:202

    }

    public Map<String, Slice> getMetadata()
    {
        return metadata;
    }

    public void validateMetadata(OrcDataSourceId orcDataSourceId, Map<String, Slice> actualMetadata)
            throws OrcCorruptionException
    {
        if (isDwrf()) {
            // Filter out metadata value statically added by the DWRF writer
            actualMetadata = actualMetadata.entrySet().stream()
                    .filter(entry -> !STATIC_METADATA.containsKey(entry.getKey()))
                    .collect(toImmutableMap(Entry::getKey, Entry::getValue));
        }

        if (!metadata.equals(actualMetadata)) {
            throw new OrcCorruptionException(orcDataSourceId, "Unexpected metadata");
        }
    }

    public OrcEncoding getOrcEncoding()
    {
        return orcEncoding;
    }

    public boolean isDwrf()
    {
        return orcEncoding == DWRF;
    }

    public ZoneId getTimezone()
    {
        return timezone;
    }

View on GitHub (pinned to 55bb57d202)

Solutions

1. Re-run the write job with a fresh output file
2. Report as a Presto ORC writer bug if reproducible with validation enabled
3. Disable write validation only as a diagnostic, not a fix

When it happens

Trigger: Thrown at presto-orc/src/main/java/com/facebook/presto/orc/OrcWriteValidation.java:202 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of prestodb/presto@55bb57d202 (2026-09-04). Data as JSON: /api/errors/d6d7c51f251a471c. Report an issue: GitHub.