jpkrohling commented on a change in pull request #2413: [wip] Draft 2 - Wrap
runs within OpenTracing spans
URL:
https://github.com/apache/incubator-openwhisk/pull/2413#discussion_r123667728
##########
File path:
core/invoker/src/main/scala/whisk/core/container/WhiskContainer.scala
##########
@@ -92,17 +96,53 @@ class WhiskContainer(
}
/**
+ * Starts the tracing.
+ */
+ private def startSpan(msg: ActivationMessage): Option[Span] = {
+ val tracerOption = if (GlobalTracer.isRegistered) Option.empty else
Some(TracerResolver.resolveTracer)
+ tracerOption foreach GlobalTracer.register
Review comment:
It might be that `tracerOption` is null at this point:
https://travis-ci.org/apache/incubator-openwhisk/builds/245871954#L6909-L6913
```
java.lang.NullPointerException: Cannot register GlobalTracer <null>.
at io.opentracing.util.GlobalTracer.register(GlobalTracer.java:83)
at
whisk.core.container.WhiskContainer$$anonfun$startSpan$1.apply(WhiskContainer.scala:104)
at
whisk.core.container.WhiskContainer$$anonfun$startSpan$1.apply(WhiskContainer.scala:104)
at scala.Option.foreach(Option.scala:257)
```
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