Batch Span Processor and OTLP Exporter Timeouts

[arielvalentin]

According to the specification, the batching processor may have a configurable timeout parameter¹:

exportTimeoutMillis - how long the export can run before it is cancelled. The default value is 30000

In addition to that the OTLP Exporter also supports a configurable timeout parameter²:

Timeout: Maximum time the OTLP exporter will wait for each batch export.
Default: 10s
Env vars: OTEL_EXPORTER_OTLP_TIMEOUT OTEL_EXPORTER_OTLP_TRACES_TIMEOUT OTEL_EXPORTER_OTLP_METRICS_TIMEOUT OTEL_EXPORTER_OTLP_LOGS_TIMEOUT

Though these settings are defined independently of one another, the Ruby implementation will always use the timeouts configured by the Batch Span Processor when used in conjunction with the OTLP Exporter:

opentelemetry-ruby/sdk/lib/opentelemetry/sdk/trace/export/batch_span_processor.rb

Line 188 in fee921b

result_code = @export_mutex.synchronize { @exporter.export(batch, timeout: timeout) }

Is there somewhere in the specification that states the Batch Span Exporter timeout should override the OTLP Exporter timeout or what the behavior should be when used together?

Footnotes

1. https://opentelemetry.io/docs/specs/otel/trace/sdk/#batching-processor ↩

2. https://opentelemetry.io/docs/specs/otel/protocol/exporter/#configuration-options ↩