Github user Ethanlm commented on a diff in the pull request:
https://github.com/apache/storm/pull/2881#discussion_r228266730
--- Diff:
storm-server/src/main/java/org/apache/storm/daemon/supervisor/timer/SynchronizeAssignments.java
---
@@ -12,16 +12,24 @@
package org.apache.storm.daemon.supervisor.timer;
+import java.util.ArrayList;
+import java.util.Collections;
import java.util.HashMap;
+import java.util.List;
import java.util.Map;
+
--- End diff --
```suggestion
```---
