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https://issues.apache.org/jira/browse/YARN-1068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776634#comment-13776634
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Bikas Saha commented on YARN-1068:
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It would be educative to compare the HAAdmin server start code with existing
admin RM server like the AdminService. I notice 2 things.
1) AdminService does not use the HAServiceProtocolServerSideTranslatorPB pattern
2) AdminService does something with HADOOP_SECURITY_AUTHORIZATION which is
missing in HAAdminService. This probably defines who has access to perform the
admin operations. We will likely need that for the HAAdmin right?
Having thought about this, it seems to me that this jira is actually blocked by
YARN-986. Without a concept of a logical name how can we expect the CLI etc to
find the correct RM address from configuration? The client conf files would be
expected to have entries for all RM instances and we would need to be able to
issue admin commands to any one of them. So we need to be able to address them
via a logical name, right? So the current approach that picks the
RM_HA_ADMIN_SERVICE address does not seem like a viable solution. Similarly,
server conf files would need to tell the server what its logical name is so
that it can try to pick and instance specific configurations. This is precisely
why we have the HAAdmin.resolveTarget() method.
Again, it would be educative to look at NNHAServiceTarget for client side and
the constructor for NameNode where is uses the logical name to translate and
re-write server side conf.
> Add admin support for HA operations
> -----------------------------------
>
> Key: YARN-1068
> URL: https://issues.apache.org/jira/browse/YARN-1068
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Affects Versions: 2.1.0-beta
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Labels: ha
> Attachments: yarn-1068-1.patch, yarn-1068-2.patch, yarn-1068-3.patch,
> yarn-1068-4.patch, yarn-1068-5.patch, yarn-1068-6.patch, yarn-1068-7.patch,
> yarn-1068-prelim.patch
>
>
> Support HA admin operations to facilitate transitioning the RM to Active and
> Standby states.
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