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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-913) Add a way to register long-lived services in a YARN cluster
Date Sat, 20 Sep 2014 16:26:37 GMT

    [ 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.



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