Provider functionality not implemented. Provider

Error message

Provider functionality not implemented. Provider '%s' will not be loaded or invoked.

What it means

This is a client warning (not an exception) emitted by Cassandra's CQL schema-description statements when a COMMENT or security-label string was written by a provider-enabled system. Provider functionality (attaching external provider metadata such as annotations/labels) is not implemented in this version, so Cassandra loads nothing but tells the client the provider was ignored. It surfaces via ClientWarn on the protocol connection.

Solutions

Remove the provider clause/identifier from the CQL statement so only the plain comment or label is applied.
If provider support is needed, upgrade to a version that implements it; on this version it is intentionally not implemented.
Ignore or filter the client warning in the driver if the provider loss is acceptable.

Example fix

// before
COMMENT ON TABLE ks.t IS 'note' WITH PROVIDER 'acme';
// after
COMMENT ON TABLE ks.t IS 'note';

Defensive patterns

Strategy: validation

Validate before calling

// before issuing schema CQL, strip provider clauses
String safeCql = cql.replaceAll("(?i)\\s*WITH\\s+PROVIDER\\s+'[^']*'", "");

Prevention

Do not emit WITH PROVIDER clauses in generated CQL on versions without provider support.
Register a driver warning handler to surface/filter ClientWarn messages.

When it happens

Trigger: Executing a schema statement (e.g. DESCRIBE output regeneration, COMMENT ON, SECURITY LABEL) whose statement carries a non-null 'provider' string; providerWarning() fires whenever that provider field is set.

Common situations: Clusters migrated from versions or forks that supported providers; tools that generate CQL with provider clauses; drivers that echo provider metadata back during schema round-trips.

Related errors

AI-assisted analysis of apache/cassandra@88fd0f6a0e (2026-09-10). Data as JSON: /api/errors/477ea7727a8baf49. Report an issue: GitHub.

Appendix: source

Thrown at src/java/org/apache/cassandra/cql3/statements/schema/SchemaDescriptionStatement.java:127

                                               FieldIdentifier fieldName)
    {
        UserType type = validateAndGetType(schema, typeName);

        if (type.fieldPosition(fieldName) == -1)
            throw ire("Field '%s' doesn't exist in type '%s.%s'", fieldName, keyspaceName, typeName);

        return type;
    }

    protected String effectiveDescription()
    {
        return description == null ? NO_DESCRIPTION : description;
    }

    protected void providerWarning(String provider)
    {
        if (provider != null)
            ClientWarn.instance.warn("Provider functionality not implemented." +
                                     " Provider '" + provider + "' will not be loaded or invoked.");
    }

    protected enum DescriptionType
    {
        COMMENT("comment", DatabaseDescriptor.getMaxCommentLength()),
        SECURITY_LABEL("security label", DatabaseDescriptor.getMaxSecurityLabelLength());

        private final String value;
        private final int maxLength;

        DescriptionType(String value, int maxLength)
        {
            this.value = value;
            this.maxLength = maxLength;
        }
    }
}

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