srdo commented on a change in pull request #2990: STORM-3372: Fix NPE when 
shutting down HFSSpout, fix storm-hdfs tests…
URL: https://github.com/apache/storm/pull/2990#discussion_r281024452
 
 

 ##########
 File path: 
external/storm-hdfs/src/main/java/org/apache/storm/hdfs/bolt/AbstractHdfsBolt.java
 ##########
 @@ -248,7 +248,9 @@ public void declareOutputFields(OutputFieldsDeclarer 
outputFieldsDeclarer) {
     @Override
     public void cleanup() {
         doRotationAndRemoveAllWriters();
-        this.rotationTimer.cancel();
+        if (this.rotationTimer != null) {
 
 Review comment:
   This is the bugfix for the NPE. If the rotation policy is not timed, this 
field is null.

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