prestodb/presto · error · PrestoException

GENERIC_INTERNAL_ERROR

GENERIC_INTERNAL_ERROR

Error message

Invalid InetAddress length:

What it means

castToIpAddress converts the parsed InetAddress to a 4- or 16-byte representation and throws GENERIC_INTERNAL_ERROR for any other byte length. Since InetAddresses.forString only ever returns 4 or 16 bytes, this is a defensive assertion indicating an unexpected internal state rather than user data problems.

Source

Thrown at presto-elasticsearch/src/main/java/com/facebook/presto/elasticsearch/decoders/IpAddressDecoder.java:85

        try {
            address = InetAddresses.forString(slice.toStringUtf8()).getAddress();
        }
        catch (IllegalArgumentException e) {
            throw new PrestoException(INVALID_CAST_ARGUMENT, "Cannot cast value to IPADDRESS: " + slice.toStringUtf8());
        }

        byte[] bytes;
        if (address.length == 4) {
            bytes = new byte[16];
            bytes[10] = (byte) 0xff;
            bytes[11] = (byte) 0xff;
            arraycopy(address, 0, bytes, 12, 4);
        }
        else if (address.length == 16) {
            bytes = address;
        }
        else {
            throw new PrestoException(GENERIC_INTERNAL_ERROR, "Invalid InetAddress length: " + address.length);
        }

        return wrappedBuffer(bytes);
    }
}

View on GitHub (pinned to 55bb57d202)

Solutions

  1. Treat it as a bug: report it with the value being decoded and the Guava/JDK versions in use.
  2. Check Guava version compatibility; upgrade or downgrade facebook/presto-elasticsearch and Guava to a known-good combination.
  3. As a workaround, map the field as VARCHAR and cast in SQL to bypass castToIpAddress.
Defensive patterns

Strategy: try-catch

Try / catch

try { runQuery(); } catch (PrestoException e) { if (e.getErrorCode().getCode() == GENERIC_INTERNAL_ERROR) { fileBugWithQueryAndData(); } throw e; }

Prevention

When it happens

Trigger: In practice unreachable: it fires only if castToIpAddress somehow obtains an InetAddress whose getAddress() length is neither 4 nor 16, i.e. a future/alternate InetAddress implementation returning an unexpected size.

Common situations: Essentially never hit by users; would appear only after a Guava/JDK behavior change or patched InetAddresses behavior, or if the decoder were modified to use a different parsing path.

Understand the failure class

Background: "This is a bug, please report it": internal invariant violations, unreachable panics, and SNH errors explained — this error's family across 47 libraries.

Related errors

AI-assisted analysis of prestodb/presto@55bb57d202 (2026-09-04). Data as JSON: /api/errors/2dc9fbcbd404c371. Report an issue: GitHub.