Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2363#discussion_r75343353
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/metrics/MetricRegistry.java
---
@@ -144,6 +152,30 @@ public MetricRegistry(Configuration config) {
}
}
+ /**
+ * Initializes the MetricQueryService.
+ *
+ * @param actorSystem ActorSystem to create the MetricQueryService on
+ */
+ public void startQueryService(ActorSystem actorSystem) {
+ try {
+ queryService =
MetricQueryService.startMetricQueryService(actorSystem);
+ } catch (Exception e) {
+ LOG.warn("Could not start MetricDumpActor. No metrics
will be submitted to the WebInterface.", e);
+ }
+ }
+
+ /**
+ * Returns an ActorRef to the MetricQueryService
+ *
+ * @return ActorRef to the MetricQueryService
+ */
+ public Option<ActorRef> getQueryService() {
+ return queryService == null
--- End diff --
this is equivalent to `Option.apply(queryService)`. If queryService ==
null, then the apply call will return a `None`.
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