Github user knusbaum commented on a diff in the pull request:
https://github.com/apache/storm/pull/1199#discussion_r55755494
--- Diff: storm-core/src/jvm/org/apache/storm/trident/Stream.java ---
@@ -124,6 +124,31 @@ public Stream parallelismHint(int hint) {
}
/**
+ * Sets the CPU Load resource for the current node
+ */
+ public Stream setCPULoad(Number load) {
--- End diff --
I can look at adding a method for including a component -> resources map
when creating a trident topology.
As for the others:
There's not really a clean way to add this to TridentTopology, and we
wanted some way to specify resources similar to RAS's API. Stream is the
cleanest place for it, and it works just like `parallelismHint(...)` does.
Having one method, 'nodeConfig(...)' with a `NodeConfig` object would
reduce the number of new methods in Stream, like you said. I don't really see
that as looking any better for the end-user, though. Consider this:
```java
TridentTopology topo = new TridentTopology();
TridentState wordCounts =
topology.newStream("spout1", spout)
.setCPULoad(50)
.setMemoryLoad(1024)
.each(new Fields("sentence"), new Split(), new Fields("word"))
.setCPULoad(100)
.setMemoryLoad(256)
.groupBy(new Fields("word"))
.persistentAggregate(new MemorymapState.Factory(), new Count(), new
Fields("count"))
.parallelismHint(6);
```
Would become this:
```java
TridentTopology topo = new TridentTopology();
TridentState wordCounts =
topology.newStream("spout1", spout)
.nodeConfig(new NodeConfig()
.setCPULoad(50)
.setMemoryLoad(1024))
.each(new Fields("sentence"), new Split(), new Fields("word"))
.nodeConfig(new NodeConfig()
.setCPULoad(100)
.setMemoryLoad(256))
.groupBy(new Fields("word"))
.persistentAggregate(new MemorymapState.Factory(), new Count(), new
Fields("count"))
.parallelismHint(6);
```
I may be missing the benefit here, but as far as I can tell, users
shouldn't really need to be aware of Nodes at all. They're supposed to be
internal to Trident.
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