Github user revans2 commented on a diff in the pull request:

    https://github.com/apache/storm/pull/2502#discussion_r159954450
  
    --- Diff: storm-client/src/jvm/org/apache/storm/cluster/ClusterUtils.java 
---
    @@ -47,7 +47,6 @@
         public static final String STORMS_ROOT = "storms";
         public static final String SUPERVISORS_ROOT = "supervisors";
         public static final String WORKERBEATS_ROOT = "workerbeats";
    -    public static final String BACKPRESSURE_ROOT = "backpressure";
    --- End diff --
    
    In order to support running older topology versions under a newer 2.x 
nimbus/etc we should still keep around the basic setup and cleanup of the 
backpressure nodes in zookeeper at least until a 3.x release.


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