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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 05:44:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412982#comment-15412982
] 

Xiao Chen commented on HADOOP-13190:
------------------------------------

Thanks [~jojochuang] for revving! Looks pretty good, and I think we're close. Nice catch on
the macro at the beginning BTW.

Nits:
- Seems a typo in KMS Client Configuration session. 'mustbe'.
- {{...(for example, a NameNode) }} -> {{(for example, HDFS NameNode) }}
- {{The host names}} -> {{hostnames}}
- {{For example, the following configuration in hdfs-site.xml sets up two KMS instances}}.
Technically they don't 'set up' the 2, since they're client side. How about we s/sets up/configures/g
?
- Suggest we add 1 sentence to describe how LBKMSCP is used. Something like: When more than
one key provider is configured in the uri, a LBKMSCP is automatically created. We can combine
this with the intro about round-robin.

> 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
>
>
> 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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