{"record":{"id":"f59a6300719688a8","repo":"apache/beam","slug":"error-in-message-batch-v","errorCode":null,"errorMessage":"error in message batch: %v","messagePattern":"error in message batch: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"sdks/go/pkg/beam/io/natsio/read.go","lineNumber":232,"sourceCode":"\t\t\tmetadata, err := msg.Metadata()\n\t\t\tif err != nil {\n\t\t\t\treturn sdf.StopProcessing(), fmt.Errorf(\"error retrieving metadata: %v\", err)\n\t\t\t}\n\n\t\t\tseqNo := int64(metadata.Sequence.Stream)\n\t\t\tif !rt.TryClaim(seqNo) {\n\t\t\t\treturn sdf.StopProcessing(), nil\n\t\t\t}\n\n\t\t\tet := fn.timestampFn(metadata.Timestamp)\n\t\t\tconsMsg := createConsumerMessage(msg, metadata.Timestamp)\n\t\t\temit(et, consMsg)\n\n\t\t\tcount++\n\t\t}\n\n\t\tif err := msgs.Error(); err != nil {\n\t\t\treturn sdf.StopProcessing(), fmt.Errorf(\"error in message batch: %v\", err)\n\t\t}\n\n\t\tif count == 0 {\n\t\t\tfn.updateWatermarkManually(we)\n\t\t\treturn sdf.ResumeProcessingIn(resumeDelay), nil\n\t\t}\n\t}\n}\n\nfunc (fn *readFn) createRTracker(rest offsetrange.Restriction) (sdf.RTracker, error) {\n\tif rest.End < math.MaxInt64 {\n\t\treturn offsetrange.NewTracker(rest), nil\n\t}\n\n\testimator := newEndEstimator(fn.js, fn.Stream, fn.Subject)\n\trt, err := offsetrange.NewGrowableTracker(rest, estimator)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"error creating growable tracker: %v\", err)","sourceCodeStart":214,"sourceCodeEnd":250,"githubUrl":"https://github.com/apache/beam/blob/12126d8942aaf848030c478b4c6a28c6af861c66/sdks/go/pkg/beam/io/natsio/read.go#L214-L250","documentation":"Returned when msgs.Error() reports a batch-level error after iterating a JetStream fetch result. Fetch can partially succeed (some messages delivered) while a request error is pending — e.g. consumer server-side reset failure, permission error on a subject, or expiration errors. The DoFn stops processing to let Beam retry.","triggerScenarios":"After consuming msgs.Messages(), msgs.Error() returns non-nil at read.go:231. Happens when the fetch encountered per-request errors such as jetstream.ErrNoResponses style failures, consumer reset exhaustion on an OrderedConsumer, or a permissions (AuthorizationViolation) error on the delivery subject mid-batch.","commonSituations":"Stream purged or deleted while the pipeline is running; NATS account permissions changed removing read access to the subject; server failover causing the ordered consumer to exceed MaxResetAttempts (5); disk-jetstream file store failures on the server.","solutions":["Inspect the wrapped error (%v) to identify whether it is a permissions, no-responders, or consumer-reset error and address accordingly.","Verify account/user permissions allow both subscribe on the subject and consumer creation on the stream (nats account info / server config).","Confirm the stream still exists and is healthy (nats stream info); recreate or restore it if purged/deleted.","Increase OrderedConsumerConfig.MaxResetAttempts if failovers are frequent in your cluster.","Rely on Beam bundle retry: because TryClaim sequences progress, reprocessing resumes from the last claimed sequence."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// pre-check permissions and stream presence before the pipeline\nsi, err := js.StreamInfo(ctx, stream)\nif err != nil { return err }\n// confirm the account may create consumers\nif si.Config.Subjects == nil { return errors.New(\"stream has no subjects\") }","typeGuard":null,"tryCatchPattern":"if err := msgs.Error(); err != nil {\n    var permErr *nats.Error\n    if errors.As(err, &permErr) && permErr.Error() == nats.ErrAuthorization.Error() {\n        return sdf.StopProcessing(), fmt.Errorf(\"permission denied during fetch batch: %w\", err)\n    }\n    return sdf.StopProcessing(), fmt.Errorf(\"error in message batch: %v\", err)\n}","preventionTips":["Grant read + consumer-management permissions to the pipeline's NATS user before deploy","Monitor stream deletion/purge operations and lock them behind change control","Tune OrderedConsumerConfig.MaxResetAttempts for failover-heavy clusters","Pin the pipeline's stream name/subject in config and validate at job startup"],"tags":["nats","jetstream","batch","consumer"],"backgroundTag":"api-error-response","analyzedSha":"12126d8942aaf848030c478b4c6a28c6af861c66","analyzedAt":"2026-09-13T01:50:10.254Z","contentChangedAt":"2026-09-13T01:50:10.254Z","schemaVersion":2},"datasetVersion":"2026-09-20T03:17:13.778Z"}