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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10757) KMSClientProvider combined with KeyProviderCache can result in wrong UGI being used
Date Fri, 21 Oct 2016 20:16:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15596252#comment-15596252
] 

Xiaoyu Yao commented on HDFS-10757:
-----------------------------------

Thanks [~xiaochen] for the review. I've done all the manual testing that I've done with HADOOP-12787
before, i.e., distcp between 
1) encryption zone and non-encryption zone
2) encryption zone and encryption zone
with 
1) webhdfs->hdfs
2) webhdfs->webhdfs
3) hdfs->webhdfs
Everything passed as expected. 

> KMSClientProvider combined with KeyProviderCache can result in wrong UGI being used
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-10757
>                 URL: https://issues.apache.org/jira/browse/HDFS-10757
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Xiaoyu Yao
>            Priority: Critical
>         Attachments: HDFS-10757.00.patch, HDFS-10757.01.patch, HDFS-10757.02.patch, HDFS-10757.03.patch
>
>
> ClientContext::get gets the context from CACHE via a config setting based name, then
KeyProviderCache stored in ClientContext gets the key provider cached by URI from the configuration,
too. These would return the same KeyProvider regardless of current UGI.
> KMSClientProvider caches the UGI (actualUgi) in ctor; that means in particular that all
the users of DFS with KMSClientProvider in a process will get the KMS token (along with other
credentials) of the first user, via the above cache.
> Either KMSClientProvider shouldn't store the UGI, or one of the caches should be UGI-aware,
like the FS object cache.
> Side note: the comment in createConnection that purports to handle the different UGI
doesn't seem to cover what it says it covers. In our case, we have two unrelated UGIs with
no auth (createRemoteUser) with bunch of tokens, including a KMS token, added.



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