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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13155) Implement TokenRenewer in KMS and HttpFS
Date Mon, 16 May 2016 17:58:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15284948#comment-15284948

Xiao Chen commented on HADOOP-13155:

Following a quick chat and advice from [~yzhangal], here's more details on how other tokens
are handled:
- {{DFSClient$Renewer}} handles {{HDFS_DELEGATION_TOKEN}}
- {{TokenAspect$TokenManager}} handles {{HFTP delegation}}, {{HSFTP delegation}}, {{WEBHDFS
delegation}}, {{SWEBHDFS delegation}}. (No httpfs, but didn't find httpfs-specific kind either)
- There are other similar classes in yarn/mr to handle corresponding tokens
- As mentioned above, no renewer class handles {{kms-dt}}

> 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
> DelegationToken is done in Yarn by {{DelegationTokenRenewer}}, where it calls {{Token#renew}}
and uses ServiceLoader to get 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])
> We seem to miss the token renewer class in KMS/HttpFSFileSystem, and hence Yarn defaults
to {{TrivialRenewer}} for DT of these kinds, resulting in the token not 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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