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From "Kan Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4056) Always start the NN's SecretManager
Date Wed, 31 Oct 2012 19:34:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488141#comment-13488141
] 

Kan Zhang commented on HDFS-4056:
---------------------------------

bq. ... there is no harm in having the secret manager running if a client using SIMPLE auth
choses to use tokens.

That would be very confusing and I certainly don't want to see it happen in my  production
cluster. I may configure a cluster to use either SIMPLE + SIMPLE or SIMPLE + TOKEN for different
purposes, but I don't see why I want to mix them up, especially at production (there is no
security benefit, only overhead).

bq. I don't understand this objection. If a token is available, why not use it?

If the conf says SIMPLE + SIMPLE, then even if a token is present, it shouldn't be used. That
token may be from a stale token file. RPC Client shouldn't even waste its time looking for
tokens.

bq. If a cluster not using tokens wants to talk to a cluster requiring tokens, then doesn't
it have to send the token regardless of the local config?

That's a different issue. I'm not sure we support an insecure cluster to talk to a secure
one right now. Is that your goal?
                
> Always start the NN's SecretManager
> -----------------------------------
>
>                 Key: HDFS-4056
>                 URL: https://issues.apache.org/jira/browse/HDFS-4056
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HDFS-4056.patch
>
>
> To support the ability to use tokens regardless of whether kerberos is enabled, the NN's
secret manager should always be started.

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