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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13190) LoadBalancingKMSClientProvider should be documented
Date Mon, 08 Aug 2016 18:49:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412255#comment-15412255

Xiao Chen commented on HADOOP-13190:

Thank you [~jojochuang] for creating this jira and posting a patch!

We should definitely document this, and overall looks good. Comments:
- Maybe we can change the current {{$H3}} level title to {{Using Multiple Instances of KMS}},
and list the current LB/VIP and the new LBKMSCP under it? The other sub-sections (kerberos,
secret-sharing) applies to multiple instances in general.
- In the new LBKMSCP section, please also add the failure-handling behavior. If a request
to a KMSCP failed, LBKMSCP will retry the next KMSCP. The request is returned as failure only
if all KMSCPs failed.
- In the sample xml, maybe also list an http example?

> 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
> 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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