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https://issues.apache.org/jira/browse/HADOOP-14104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15887103#comment-15887103
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Andrew Wang commented on HADOOP-14104:
--------------------------------------

Thanks for working on this Rushabh, patch looks pretty close, just some nits:

* FtpConfigKeys and LocalConfigKeys, would still be nice to introduce a new 
variable for documentation purposes
* I dislike non-trivial ternary statements, mind rewriting 
DFSClient#getKeyProviderUri a bit? We can also dedupe the call to 
{{getKeyProviderUri}} for clarity.
* Still could use a doc update in TransparentEncryption.md about how this is 
fetched from server-side defaults.

Could you comment on potential additional overheads from invoking the NNto 
query this config value? I don't see {{getServerDefaults}} used much right now, 
so it looks like this will add another NN RPC to many client operations, for 
both unencrypted and encrypted clusters. This is concerning.

> Client should always ask namenode for kms provider path.
> --------------------------------------------------------
>
>                 Key: HADOOP-14104
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14104
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: kms
>            Reporter: Rushabh S Shah
>            Assignee: Rushabh S Shah
>         Attachments: HADOOP-14104-trunk.patch, HADOOP-14104-trunk-v1.patch
>
>
> According to current implementation of kms provider in client conf, there can 
> only be one kms.
> In multi-cluster environment, if a client is reading encrypted data from 
> multiple clusters it will only get kms token for local cluster.
> Not sure whether the target version is correct or not.



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