Yu-Tang Lin commented on YARN-6885:

Hi [#Daniel Templeton], thanks for the comment!
I put the text and val object outside the switch case due to I can't reuse the 
same variable name just like the previous code in each case section, but just 
like you mentioned, it'll cost more to cast the variable.
About the comment 4 and 5, I tried the treat these two cases just like other 
cases in previous patch, but the finding-bugs plugin showed that the boxing 
issues might be occurred, so I added the brace and tried to use primitive 
Could you please give me some suggestions?

And I didn't get the comment 6, do you mean the code below should be put in the 
default case section? 
  if (isLeaf && !"parent".equals(element.getAttribute("type"))) {
    } else {
      if (isReservable) {
        throw new AllocationConfigurationException("The configuration settings"
            + " for " + queueName + " are invalid. A queue element that "
            + "contains child queue elements or that has the type='parent' "
            + "attribute cannot also include a reservation element.");


> AllocationFileLoaderService.loadQueue() should use a switch statement in the 
> main tag parsing loop instead of the if/else-if/...
> --------------------------------------------------------------------------------------------------------------------------------
>                 Key: YARN-6885
>                 URL: https://issues.apache.org/jira/browse/YARN-6885
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>    Affects Versions: 3.0.0-alpha4
>            Reporter: Daniel Templeton
>            Assignee: Yu-Tang Lin
>            Priority: Minor
>              Labels: newbie
>             Fix For: 3.0.0-alpha4
>         Attachments: YARN-6885.005.patch
> {code}      if ("minResources".equals(field.getTagName())) {
>         String text = ((Text)field.getFirstChild()).getData().trim();
>         Resource val =
>             FairSchedulerConfiguration.parseResourceConfigValue(text);
>         minQueueResources.put(queueName, val);
>       } else if ("maxResources".equals(field.getTagName())) {
>       ...{code}

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