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

    https://github.com/apache/twill/pull/71#discussion_r221661663
  
    --- Diff: 
twill-yarn/src/main/java/org/apache/twill/internal/yarn/YarnUtils.java ---
    @@ -345,6 +388,28 @@ private static FileSystem 
getFileSystem(LocationFactory locationFactory) throws
         return null;
       }
     
    +  private static void handleLogAction(Exception e) {
    --- End diff --
    
    This method is unnecessary, better log it in place. E.g. in the static 
initializer above:
    
    ```java
    static {
      try {
        Class dfsUtilsClientClazz = 
Class.forName("org.apache.hadoop.hdfs.DFSUtilClient");
        getHaNnRpcAddressesMethod = 
dfsUtilsClientClazz.getMethod("getHaNnRpcAddresses",
            Configuration.class);
        hasDFSUtilClient = true;
      } catch (ClassNotFoundException e) {
        // Expected for Hadoop version < 2.8, hence log it as debug only to no 
polluting the logs
        LOG.debug("No DFSUtilClient found", e);
      } catch (NoSuchMethodException e) {
        // This is unexpected for not founding the getHaNnRpcAddresses method 
if the DFSUtilClient class exists
        LOG.warn("No DFSUtilClient.getHaNnRpcAddresses method found. Getting HA 
NameNode address might fail.", e);
      }
    }
    ```


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