apache/seatunnel · warning

Graph operation failed on attempt {}/{}. Error: {}

Error message

Graph operation failed on attempt {}/{}. Error: {}

What it means

WARN emitted by HugeGraphClient.executeGraphOperation when a graph write attempt fails on a retryable error and will be retried (attempt N of totalAttempts). After logging, reconnect() discards the client and sleep/retry continues. If all attempts are exhausted, a HugeGraphConnectorException is thrown with BUILD_CLIENT_FAILED or a non-retryable message instead.

Source

Thrown at seatunnel-connectors-v2/connector-hugegraph/src/main/java/org/apache/seatunnel/connectors/seatunnel/hugegraph/client/HugeGraphClient.java:247

            try {
                ensureClientInitialized();
                operation.execute(this.client.graph());
                return;
            } catch (ServerException | ClientException e) {
                if (!isRetryable(e) || !idempotent) {
                    LOG.error(
                            "Server rejected the request ({}): {}",
                            idempotent ? "non-retryable" : "non-idempotent, not retrying",
                            e.getMessage());
                    throw new HugeGraphConnectorException(
                            HugeGraphConnectorErrorCode.GRAPH_OPERATION_FAILED,
                            "Server rejected the request"
                                    + (idempotent ? " (non-retryable)" : " (non-idempotent)")
                                    + ": "
                                    + e.getMessage(),
                            e);
                }
                LOG.warn(
                        "Graph operation failed on attempt {}/{}. Error: {}",
                        attempt,
                        totalAttempts,
                        e.getMessage());
                reconnect();

                if (attempt == totalAttempts) {
                    LOG.error("Max retries ({}) reached. Failing task.", this.maxRetries);
                    throw new HugeGraphConnectorException(
                            HugeGraphConnectorErrorCode.GRAPH_OPERATION_FAILED,
                            "Failed to execute graph operation after "
                                    + totalAttempts
                                    + " attempt(s). Last error: "
                                    + e.getMessage(),
                            e);
                }

                sleepBeforeRetry(attempt);

View on GitHub (pinned to cf67b549a7)

Solutions

1. Wait — the operation retries automatically; check whether subsequent attempts succeed
2. If attempts exhaust, check HugeGraph server health and logs for the failing period
3. Reduce batch size or increase request timeout to lower per-request failure probability
4. Increase retry attempt count in connector configuration for flaky networks

// Pre-flight: verify server can accept writes within timeout
curl -sf -X POST http://hugegraph:8080/graphs/<graph>/schema/propertykeys -H 'Content-Type: application/json' -d '{"name":"probe","data_type":"TEXT"}'

try {
    executeIdempotentWrite(op);
} catch (HugeGraphConnectorException e) {
    if (e.getErrorCode() == HugeGraphConnectorErrorCode.BUILD_CLIENT_FAILED) {
        // retries exhausted: alert and requeue the batch
    }
    throw e;
}

When it happens

Trigger: executeIdempotentWrite -> executeGraphOperation throws a retryable connection/transport exception (timeout, connection reset, 5xx) while writing vertices/edges; the operation is retried up to totalAttempts times.

Common situations: HugeGraph server overloaded or GC-pausing during bulk loads, transient network drops between worker and server, server restarts mid-write, or per-request timeouts set too low for large batches.

Understand the failure class

Background: "API request failed": what wrapped HTTP errors from external APIs mean and how to find the real cause — this error's family across 29 libraries.

Related errors

• Failed to write %d items to table %s after %d retries
• GRAPH_OPERATION_FAILED
• FLUSH_DATA_FAILED
• Edge socket receiver loop exception, retrying
• [%d] request http failed

AI-assisted analysis of apache/seatunnel@cf67b549a7 (2026-09-10). Data as JSON: /api/errors/58a682c4e10e028f. Report an issue: GitHub.