virajjasani opened a new pull request, #5433:
URL: https://github.com/apache/hadoop/pull/5433

   ```
   util.ExitUtil - Exiting with status 1: 
org.apache.hadoop.service.ServiceStateException: java.io.IOException: Running 
in secure mode, but config doesn't have a keytab
   1: org.apache.hadoop.service.ServiceStateException: java.io.IOException: 
Running in secure mode, but config doesn't have a keytab
     at org.apache.hadoop.util.ExitUtil.terminate(ExitUtil.java:264)
   ..
   ..
   ``` 
   
   When multiple downstreamers use different configs to present the same keytab 
file, if one of the config key gets missing or overridden as part of config 
generators, it becomes bit confusing for operators to realize which config is 
missing for a particular service, especially when keytab file value is already 
present with different config.
   
   It would be nice to report config key with the stacktrace error message.
   


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