Github user Ethanlm commented on a diff in the pull request:
https://github.com/apache/storm/pull/2881#discussion_r228266466
--- Diff:
storm-server/src/main/java/org/apache/storm/daemon/supervisor/timer/SupervisorHeartbeat.java
---
@@ -17,14 +17,23 @@
import java.util.HashMap;
import java.util.List;
import java.util.Map;
+import java.util.stream.Collectors;
+
--- End diff --
```suggestion
```---
