{"record":{"id":"251dfc1dcdbea997","repo":"apache/seatunnel","slug":"failed-to-publish-nats-jetstream-message-for-subta","errorCode":null,"errorMessage":"Failed to publish NATS JetStream message for subtask ${subtaskIndex} to subject '${subject}'","messagePattern":"Failed to publish NATS JetStream message for subtask (.+?) to subject '(.+?)'","errorType":"exception","errorClass":"IOException","httpStatus":null,"severity":"error","filePath":"seatunnel-connectors-v2/connector-nats-jetstream/src/main/java/org/apache/seatunnel/connectors/seatunnel/natsjetstream/sink/NatsJetStreamSinkWriter.java","lineNumber":197,"sourceCode":"        } catch (Exception e) {\n            primaryFailure.addSuppressed(new IOException(\"Failed to close NATS connection\", e));\n        }\n    }\n\n    private void publish(PublishRequest publishRequest) throws IOException {\n        PublishOptions.Builder optionsBuilder =\n                PublishOptions.builder().streamTimeout(PUBLISH_TIMEOUT);\n        if (publishRequest.messageId != null) {\n            optionsBuilder.messageId(publishRequest.messageId);\n        }\n        try {\n            jetStream.publish(\n                    publishRequest.subject,\n                    publishRequest.headers,\n                    publishRequest.payload,\n                    optionsBuilder.build());\n        } catch (JetStreamApiException e) {\n            throw publishFailure(publishRequest.subject, e);\n        } catch (IOException | RuntimeException e) {\n            throw publishFailure(publishRequest.subject, e);\n        }\n    }\n\n    private IOException publishFailure(String subject, Exception cause) {\n        return new IOException(\n                String.format(\n                        \"Failed to publish NATS JetStream message for subtask %d to subject '%s'\",\n                        subtaskIndex, subject),\n                cause);\n    }\n\n    private static boolean isNotBlank(String value) {\n        return value != null && !value.trim().isEmpty();\n    }\n\n    static NatsJetStreamConnectorException invalidRecord(String fieldName, String message) {","sourceCodeStart":179,"sourceCodeEnd":215,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-connectors-v2/connector-nats-jetstream/src/main/java/org/apache/seatunnel/connectors/seatunnel/natsjetstream/sink/NatsJetStreamSinkWriter.java#L179-L215","documentation":"This IOException is thrown by the sink writer's publish method when jetStream.publish fails for any reason (JetStreamApiException, IOException, or RuntimeException) while writing a message to the given subject. It wraps the underlying cause with subtask index and subject context so the failure is attributable in logs/checkpoint handling; being thrown from write(), it will fail the sink task and trigger the engine's retry/restart semantics.","triggerScenarios":"NATS server returns a JetStream API error (e.g. no responders, stream not found, message too large, exceeded max message size or publish limits); network I/O errors to the NATS server; any RuntimeException from the publish path.","commonSituations":"Stream or subject not bound to a JetStream stream (subject has no listeners/stream); NATS server down or unreachable; publishing payloads exceeding stream max_msg_size; authentication/authorization failures at publish time; transient network partitions during long-running jobs.","solutions":["Verify the subject is covered by an existing JetStream stream (nats stream info / subject mapping)","Check NATS server connectivity and credentials; test with nats pub to the same subject","Compare payload size against the stream's max_msg_size and compress/trim payloads","Retry the job — transient network errors may resolve; add sink retry/resilience options if available","Inspect the wrapped cause in logs for the specific JetStream API error code"],"exampleFix":"// before\njetStream.publish(subject, payload); // fails: no stream covers 'events'\n// after\n// create/bind the stream first:\n// nats str add EVENTS --subjects \"events.>\"\njetStream.publish(\"events.data\", payload);","handlingStrategy":"try-catch","validationCode":"// pre-flight: ensure stream covers subject and server is reachable\ntry (Connection c = Nats.connect(\"nats://host:4222\")) {\n    JetStreamManagement jsm = c.jetStreamManagement();\n    StreamInfo si = jsm.getStreamForSubject(subject);\n    System.out.println(\"Stream \" + si.getConfig().getName() + \" covers \" + subject);\n}","typeGuard":null,"tryCatchPattern":"try {\n    writer.write(row);\n} catch (IOException e) {\n    if (e.getCause() instanceof JetStreamApiException) {\n        // inspect API error code; non-retryable (e.g. no stream) -> fail fast / fix config\n    } else {\n        // transient I/O -> rely on engine restart or backoff-retry\n    }\n    throw e; // let checkpointing record the failure\n}","preventionTips":["Create JetStream streams covering all publish subjects before running jobs","Monitor NATS server health and set appropriate connection timeouts/reconnect settings","Keep payloads under the stream's max_msg_size (default 1MB)","Ensure publish permissions exist for the connecting NATS account","Test subjects with nats CLI before production deployment"],"tags":["nats","jetstream","network","publish","io"],"backgroundTag":"api-request-failed","analyzedSha":"cf67b549a7a6c35fa0beb12d83c62892427ea919","analyzedAt":"2026-09-10T21:44:55.265Z","contentChangedAt":"2026-09-10T21:44:55.265Z","schemaVersion":2},"datasetVersion":"2026-09-14T11:17:12.474Z"}