Github user satishd commented on a diff in the pull request:
https://github.com/apache/storm/pull/2241#discussion_r129214771
--- Diff: storm-client/src/jvm/org/apache/storm/daemon/GrouperFactory.java
---
@@ -137,7 +137,7 @@ public void prepare(WorkerTopologyContext context,
GlobalStreamId stream, List<I
public static class FieldsGrouper implements CustomStreamGrouping {
private Fields outFields;
- private List<Integer> targetTasks;
+ private ArrayList<List<Integer> > targetTasks;
--- End diff --
nit: No need to change from List to ArrayList.
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