prestodb/presto · error · PrestoException

NOT_SUPPORTED

NOT_SUPPORTED

Error message

Black hole connector does not supported distributed reads

What it means

The BlackHole connector only supports system-created partitioning for writes; requesting a split-to-bucket mapping (distributed reads) hits an unsupported-operation sentinel in getSplitBucketFunction.

Source

Thrown at presto-blackhole/src/main/java/com/facebook/presto/plugin/blackhole/BlackHoleNodePartitioningProvider.java:59

    {
        this.nodeManager = requireNonNull(nodeManager, "nodeManager is null");
    }

    @Override
    public ConnectorBucketNodeMap getBucketNodeMap(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorPartitioningHandle partitioningHandle, List<Node> sortedNodes)
    {
        // create one bucket per node
        return createBucketNodeMap(nodeManager.getRequiredWorkerNodes().size());
    }

    @Override
    public ToIntFunction<ConnectorSplit> getSplitBucketFunction(
            ConnectorTransactionHandle transactionHandle,
            ConnectorSession session,
            ConnectorPartitioningHandle partitioningHandle)
    {
        return value -> {
            throw new PrestoException(NOT_SUPPORTED, "Black hole connector does not supported distributed reads");
        };
    }

    @Override
    public BucketFunction getBucketFunction(
            ConnectorTransactionHandle transactionHandle,
            ConnectorSession session,
            ConnectorPartitioningHandle partitioningHandle,
            List<Type> partitionChannelTypes, int bucketCount)
    {
        return (page, position) -> {
            long hash = 13;
            for (int i = 0; i < partitionChannelTypes.size(); i++) {
                Type type = partitionChannelTypes.get(i);
                hash = 31 * hash + type.hash(page.getBlock(i), position);
            }

            // clear the sign bit

View on GitHub (pinned to 55bb57d202)

Solutions

1. Remove partitioning/table-layout requirements that force bucketed reads against BlackHole
2. Use a real connector for distributed read tests

When it happens

Trigger: Thrown at presto-blackhole/src/main/java/com/facebook/presto/plugin/blackhole/BlackHoleNodePartitioningProvider.java:59 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

Background: Presto NOT_SUPPORTED error: what "not supported" means and how to fix it — this error's family across 3 libraries.

AI-assisted analysis of prestodb/presto@55bb57d202 (2026-09-04). Data as JSON: /api/errors/27bd0a97f1958dce. Report an issue: GitHub.