sandeep-paliwal commented on a change in pull request #2282: Distributed
tracing support #2192
URL:
https://github.com/apache/incubator-openwhisk/pull/2282#discussion_r120581751
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File path: common/scala/src/main/resources/application.conf
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@@ -12,3 +12,22 @@ akka.http {
max-open-requests = 128
}
}
+
+akka.tracing {
+ #zipkin configuration
+ host = "localhost"
+ host = ${?TRACING_HOST} # Override default HOST by enviornment variable
+ port = 9410 # default
+ port = ${?TRACING_PORT} # Override default PORT by enviornment variable
+ sample-rate = 100 # by default trace every 100th request
Review comment:
Thanks Adrian for your comment. But I think sample rate in akka-tracing lib
is being treated as `int`
[(https://github.com/levkhomich/akka-tracing/blob/master/core/src/main/scala/com/github/levkhomich/akka/tracing/TracingExtension.scala#L43)](https://github.com/levkhomich/akka-tracing/blob/master/core/src/main/scala/com/github/levkhomich/akka/tracing/TracingExtension.scala#L43)
and does a mod on request counter.
([https://github.com/levkhomich/akka-tracing/blob/master/core/src/main/scala/com/github/levkhomich/akka/tracing/TracingExtension.scala#L324](https://github.com/levkhomich/akka-tracing/blob/master/core/src/main/scala/com/github/levkhomich/akka/tracing/TracingExtension.scala#L324))
So a value between 0 - 1.0 would switch off the tracing.
I have kept a default of 100 which makes default tracing as 1%.
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