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https://issues.apache.org/jira/browse/HADOOP-10670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14381367#comment-14381367
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Sangjin Lee commented on HADOOP-10670:
--------------------------------------

I believe this breaks the RM. Prior to this JIRA, 
RMAuthenticationFilterInitializer threw an exception only if security was 
enabled (see l.99):

{code}
95            } catch (IOException ex) {                
96              // if running in non-secure mode, this filter only gets added   
        
97              // because the user has not setup his own filter so just 
generate               
98              // a random secret. in secure mode, the user needs to setup 
security            
99              if (UserGroupInformation.isSecurityEnabled()) {         
100               throw new RuntimeException(           
101                 "Could not read HTTP signature secret file: " + 
signatureSecretFile);               
102             }               
103           } finally {               
104             IOUtils.closeQuietly(reader);           
105           }         
{code}

Now it appears that this check has been removed.

> Allow AuthenticationFilters to load secret from signature secret files
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-10670
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10670
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>            Priority: Minor
>             Fix For: 2.7.0
>
>         Attachments: HADOOP-10670-v4.patch, HADOOP-10670-v5.patch, 
> HADOOP-10670-v6.patch, hadoop-10670-v2.patch, hadoop-10670-v3.patch, 
> hadoop-10670.patch
>
>
> In Hadoop web console, by using AuthenticationFilterInitializer, it's allowed 
> to configure AuthenticationFilter for the required signature secret by 
> specifying signature.secret.file property. This improvement would also allow 
> this when AuthenticationFilterInitializer isn't used in situations like 
> webhdfs.



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