[
https://issues.apache.org/jira/browse/YARN-913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14142090#comment-14142090
]
Steve Loughran commented on YARN-913:
-------------------------------------
Oh, one more thing, that {{MicroZookeeperService}} which is used in tests? It's
a YARN service-wrapped ZK microservice (based on Twill's test one), which can
publish its ensemble information to registry clients running in-VM. This would
make it straightforward to be deployed *inside* the RM ... in a small 1-2 node
cluster it wouldn't be a load problem, and as the lifespan of the ZK ==
lifespan of RM, no worry about having a single ZK quorum outage impacting the
RM.
I've not put the service under the RM. Someone is free to at some point in the
future.
> Add a way to register long-lived services in a YARN cluster
> -----------------------------------------------------------
>
> Key: YARN-913
> URL: https://issues.apache.org/jira/browse/YARN-913
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: api, resourcemanager
> Affects Versions: 2.5.0, 2.4.1
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: 2014-09-03_Proposed_YARN_Service_Registry.pdf,
> 2014-09-08_YARN_Service_Registry.pdf, RegistrationServiceDetails.txt,
> YARN-913-001.patch, YARN-913-002.patch, YARN-913-003.patch,
> YARN-913-003.patch, YARN-913-004.patch, YARN-913-006.patch,
> YARN-913-007.patch, YARN-913-008.patch, yarnregistry.pdf, yarnregistry.tla
>
>
> In a YARN cluster you can't predict where services will come up -or on what
> ports. The services need to work those things out as they come up and then
> publish them somewhere.
> Applications need to be able to find the service instance they are to bond to
> -and not any others in the cluster.
> Some kind of service registry -in the RM, in ZK, could do this. If the RM
> held the write access to the ZK nodes, it would be more secure than having
> apps register with ZK themselves.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
