Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1515#discussion_r68279943
--- Diff: storm-core/src/jvm/org/apache/storm/topology/TopologyBuilder.java
---
@@ -113,6 +113,15 @@ public StormTopology createTopology() {
Map<String, Bolt> boltSpecs = new HashMap<>();
Map<String, SpoutSpec> spoutSpecs = new HashMap<>();
maybeAddCheckpointSpout();
+
+ if (_spouts.size() == 0) {
+ throw new IllegalArgumentException("Spouts is not set");
+ }
+
+ if (_bolts.size() == 0) {
--- End diff --
We have topologies that only have spouts (no bolts). I know it is kind of
an odd corner case where someone is just reading from an input and writing to
an output in one shot, but it is something that we have.
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