iwasakims commented on a change in pull request #2065:
URL: https://github.com/apache/hadoop/pull/2065#discussion_r438522222



##########
File path: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/v2/MiniMRYarnCluster.java
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@@ -259,7 +267,10 @@ public void run() {
           };
         }.start();

Review comment:
       historyServer is not initialized if 
`mapreduce.jobhistory.minicluster.enabled` is set to `false`. I would like to 
keep the default value to be `true` to avoid breaking existing tests of hadoop 
and downstreams.




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