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https://issues.apache.org/jira/browse/HADOOP-10895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14194182#comment-14194182
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Yi Liu commented on HADOOP-10895:
---------------------------------

Hi [~yzhangal], your patch has a big impact, and my suggestion is to make it 
small. Also I would like to hear other committers' comments, since it looks 
simple, but trick.
* I see you remove existing APIs/Constructor from AuthenticatedURL.java and 
DelegationTokenAuthenticatedURL.java, it's not a good practice. It will break 
others who are using {{hadoop-auth}}
* we don't need get fallback for Authenticator, and only need set
{code}
public void setAllowFallback(boolean allowFallback);
{code}
* I suggest only add a simple method to AuthenticatedURL, and no need change 
for DelegationTokenAuthenticatedURL
{code}
public void setAllowAuthenticatorFallback(boolean allowFallback) {
  authenticator.setAllowFallback(allowFallback);
}
{code}
* Other places just need to call {{setAllowAuthenticatorFallback}} of 
AuthenticatedURL or {{setAllowFallback}} of Authenticator. Then it's more 
simpler. 




> HTTP KerberosAuthenticator fallback should have a flag to disable it
> --------------------------------------------------------------------
>
>                 Key: HADOOP-10895
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10895
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.4.1
>            Reporter: Alejandro Abdelnur
>            Assignee: Yongjun Zhang
>            Priority: Blocker
>         Attachments: HADOOP-10895.001.patch, HADOOP-10895.002.patch, 
> HADOOP-10895.003.patch, HADOOP-10895.004.patch
>
>
> Per review feedback in HADOOP-10771, {{KerberosAuthenticator}} and the 
> delegation token version coming in with HADOOP-10771 should have a flag to 
> disable fallback to pseudo, similarly to the one that was introduced in 
> Hadoop RPC client with HADOOP-9698.



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