leventov commented on a change in pull request #6606: Simplify
DruidNodeDiscoveryProvider; add
DruidNodeDiscovery.Listener.nodeViewInitialized()
URL: https://github.com/apache/incubator-druid/pull/6606#discussion_r237253644
##########
File path:
server/src/main/java/org/apache/druid/discovery/DruidNodeDiscoveryProvider.java
##########
@@ -66,10 +65,11 @@ public DruidNodeDiscovery getForService(String serviceName)
if (nodeTypesToWatch == null) {
throw new IAE("Unknown service [%s].", service);
}
-
- ServiceDruidNodeDiscovery serviceDiscovery = new
ServiceDruidNodeDiscovery(service);
+ ServiceDruidNodeDiscovery serviceDiscovery = new
ServiceDruidNodeDiscovery(service, nodeTypesToWatch.size());
+ DruidNodeDiscovery.Listener filteringGatheringUpstreamListener =
+ serviceDiscovery.filteringUpstreamListener();
for (NodeType nodeType : nodeTypesToWatch) {
-
getForNodeType(nodeType).registerListener(serviceDiscovery.nodeTypeListener());
+
getForNodeType(nodeType).registerListener(filteringGatheringUpstreamListener);
}
Review comment:
I don't understand about what one like you are talking here. I spent
literally several hours wrapping my head around the former code.
You cannot just increment the `uninitializedNodeTypes` counter each time
`registerListener()` is called, because `ServiceDruidNodeDiscovery` is exposed
to third-party users via `getForService()` method and they could add their own
listeners. The initialization setup happens in
`serviceDiscoveryMap.computeIfAbsent()` lambda and it set the fixed number of
`uninitializedNodeTypes`.
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