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

    https://github.com/apache/twill/pull/40#discussion_r107347432
  
    --- Diff: 
twill-yarn/src/main/java/org/apache/twill/yarn/YarnTwillController.java ---
    @@ -77,7 +77,7 @@
        */
       YarnTwillController(String appName, RunId runId, ZKClient zkClient,
                           final ApplicationMasterLiveNodeData amLiveNodeData, 
final YarnAppClient yarnAppClient) {
    -    super(runId, zkClient, Collections.<LogHandler>emptyList());
    +    super(appName, runId, zkClient, amLiveNodeData.getKafkaZKConnect() != 
null, Collections.<LogHandler>emptyList());
    --- End diff --
    
    ? I don't understand, can you give me an example? The current logic is, 
from an existing app discovered via ZK, if the AM live node data doesn't have 
the KafkaZKConnect string, that means the app was launched with log collection 
disabled, hence the logic here.


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