Tail sampling fails to start when decision wait is lower than 1s

[jpkrohling]

Component(s)

processor/tailsampling

What happened?

When setting the decision_wait parameter to a value lower than 1s, the following error message is shown during the startup:

2023/08/31 09:28:53 collector server run finished with error: failed to build pipelines: failed to create "tail_sampling" processor, in pipeline "traces/export": invalid number of batches, it must be greater than zero

A workaround is to use a decision wait of at least 1s.

Collector version

v0.84.0

Environment information

No response

OpenTelemetry Collector configuration

receivers:
  otlp:
    protocols:
      grpc:

processors:
  tail_sampling:
    decision_wait: 500ms
    num_traces: 50_000
    expected_new_traces_per_sec: 10_000
    policies:
      [
          {
            name: only-10-percent,
            type: probabilistic,
            probabilistic: {sampling_percentage: 10}
          },
      ]

exporters:
  logging:

connectors:

service:
  pipelines:
    traces:
      receivers:
        - otlp
      processors:
        - tail_sampling
      exporters:
        - logging

Log output

2023-08-31T09:31:48.873-0300    info    service/telemetry.go:84 Setting up own telemetry...
2023-08-31T09:31:48.874-0300    info    service/telemetry.go:201        Serving Prometheus metrics      {"address": ":8888", "level": "Basic"}
2023-08-31T09:31:48.874-0300    info    exporter@v0.83.0/exporter.go:275        Development component. May change in the future.        {"kind": "exporter", "data_type": "traces", "name": "logging"}
Error: failed to build pipelines: failed to create "tail_sampling" processor, in pipeline "traces": invalid number of batches, it must be greater than zero
2023/08/31 09:31:48 collector server run finished with error: failed to build pipelines: failed to create "tail_sampling" processor, in pipeline "traces": invalid number of batches, it must be greater than zero

Additional context

No response

[github-actions]

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