[jira] [Commented] (HADOOP-8857) hadoop.http.authentication.signature.secret.file should be created if the configured file does not exist

["Alejandro Abdelnur (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-8857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13562247#comment-13562247 ] 

Alejandro Abdelnur commented on HADOOP-8857:
--------------------------------------------

The secret cannot be generated randomly in the case of a cluster as the secret must be shared by ALL machines. We have to update the docs removing the 'generated randomly' comment.
                
> hadoop.http.authentication.signature.secret.file should be created if the configured file does not exist
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8857
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8857
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Owen O'Malley
>            Priority: Minor
>
> AuthenticationFilterInitializer#initFilter fails if the configured {{hadoop.http.authentication.signature.secret.file}} does not exist, eg:
> {noformat}
> java.lang.RuntimeException: Could not read HTTP signature secret file: /var/lib/hadoop-hdfs/hadoop-http-auth-signature-secret
> {noformat}
> Creating /var/lib/hadoop-hdfs/hadoop-http-auth-signature-secret (populated with a string) fixes the issue. Per the auth docs "If a secret is not provided a random secret is generated at start up time.", which sounds like it means the file should be generated at startup with a random secrete, which doesn't seem to be the case. Also the instructions in the docs should be more clear in this regard.

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