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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13190) LoadBalancingKMSClientProvider should be documented
Date Tue, 09 Aug 2016 17:36:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15413891#comment-15413891

Xiao Chen commented on HADOOP-13190:

Thanks Wei-Chiu. Patch 3 looks great, +1 pending the following nitter nits:
- {{requests from the same user may be handled by different KMS instances}} s/user/client/g
- {{clients are unaware there are multiple KMS instances.}} s/there are multiple KMS instances/of
multiple KMS instances at the server-side/g
- In the LBKMSCP example, please use 9600 as the port instead of 16000.

> LoadBalancingKMSClientProvider should be documented
> ---------------------------------------------------
>                 Key: HADOOP-13190
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13190
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation, kms
>    Affects Versions: 2.7.0
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>              Labels: supportability
>         Attachments: HADOOP-13190.001.patch, HADOOP-13190.002.patch, HADOOP-13190.003.patch
> Currently, there are two ways to achieve KMS HA.
> The first one, and the only documented one, is running multiple KMS instances behind
a load balancer. https://hadoop.apache.org/docs/stable/hadoop-kms/index.html
> The other way, is make use of LoadBalancingKMSClientProvider which is added in HADOOP-11620.
However the usage is undocumented.
> I think we should update the KMS document to introduce LoadBalancingKMSClientProvider,
provide examples, and also update kms-site.xml to explain it.

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