SDK Thrown Unhandled Exception is OTEL Collector if not available

[yahorsi]

Steps to reproduce
Start Open Telemetry instrumented app while OTEL Collector is not available, app cannot start

What is the expected behavior?
App does not crash

What is the actual behavior?
App crashes

[brettmc]

Hi @yahorsi are you certain that it crashed the app? The export failure exception has been captured and logged (and you can configure where the logs go)

I updated one of our example scripts here to use batch span processor, and it seems to me to behave correctly:

# php examples/traces/exporters/otlp_http.php 
Starting OTLP example
OTLP example complete!  
OpenTelemetry: [error] Export failure [exception] Export retry limit exceeded [previous] cURL error 6: Could not resolve host: collector (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for http://collector:4318/v1/traces
#0 /usr/src/myapp/src/Contrib/Otlp/SpanExporter.php(38): OpenTelemetry\SDK\Common\Export\Http\PsrTransport->send('\n\x98\r\n\x9E\x06\n\e\n\thost....', NULL)
#1 /usr/src/myapp/src/SDK/Trace/SpanProcessor/BatchSpanProcessor.php(247): OpenTelemetry\Contrib\Otlp\SpanExporter->export(Array)
#2 /usr/src/myapp/src/SDK/Trace/SpanProcessor/BatchSpanProcessor.php(190): OpenTelemetry\SDK\Trace\SpanProcessor\BatchSpanProcessor->flush('shutdown', NULL)
#3 /usr/src/myapp/src/SDK/Trace/TracerSharedState.php(71): OpenTelemetry\SDK\Trace\SpanProcessor\BatchSpanProcessor->shutdown(NULL)
#4 /usr/src/myapp/src/SDK/Trace/TracerProvider.php(98): OpenTelemetry\SDK\Trace\TracerSharedState->shutdown(NULL)
#5 /usr/src/myapp/examples/traces/exporters/otlp_http.php(53): OpenTelemetry\SDK\Trace\TracerProvider->shutdown()
#6 {main}

# echo $?
0

The return code from CLI is 0 (success). If you change the log destination, for example dropping putenv('OTEL_PHP_LOG_DESTINATION=none'); into your code, it should suppress the logging of errors. Does that change what you see in terms of crash/not?

[brettmc]

@yahorsi do you have a custom error handler that might be turning a NOTICE into an exception?