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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13155) Implement TokenRenewer in KMS and HttpFS
Date Thu, 19 May 2016 17:56:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15291654#comment-15291654

Arun Suresh commented on HADOOP-13155:

Thanks for taking this up [~xiaochen]..

IIRC, the reason why we had not implemented the renewer for KMS was that we were catering
to {{FileSystem}} and {{DistributedFileSystem}} API which at that point had only an {{addDelegationTokens()}}.

So, I guess it is a good idea to add a Renewer for KMS-DTs. Will go over you patch in more
detail over the weekend.

bq. Since looks like MiniKMS is setup with PseudoAuthenticationHandler by default (didn't
find a way to configure auth type before starting MiniKMS.
I remember testing KMS via {{TestKMS}} using the {{KerberosDelegationTokenAuthenticationHandler}}.
Take a look at {{TestKMS::testStartStop}} method where we do a {{conf.set("hadoop.kms.authentication.type",
"kerberos")}} before running the KMS server.

> Implement TokenRenewer in KMS and HttpFS
> ----------------------------------------
>                 Key: HADOOP-13155
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13155
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HADOOP-13155.pre.patch
> Service DelegationToken (DT) renewal is done in Yarn by {{org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer}},
where it calls {{Token#renew}} and uses ServiceLoader to find the renewer class ([code|https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java#L382]),
and invokes the renew method from it.
> We seem to miss the token renewer class in KMS / HttpFSFileSystem, and hence Yarn defaults
to {{TrivialRenewer}} for DT of such kinds, resulting in the token not being renewed.
> As a side note, {{HttpFSFileSystem}} does have a {{renewDelegationToken}} API, but I
don't see it invoked in hadoop code base. KMS does not have any renew hook.

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